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Potential application of hydrophobically modified Welan gum as a novel thermo-salt tolerant EOR agent in high-temperature and high-salinity reservoirs 认领 引用
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作者 Jia Chen Zhao-Kai Wang +2 位作者 Wan-Lei Geng Hao-Ran Cheng Guang Zhao 《Petroleum Science》 SCIE EI CAS CSCD 2026年第5期2821-2832,共12页
Conventionalpolymeric systems face significant challengesin maintaining performance under hightemperature,high-salinity reservoir conditions due to limited thermal and saline stability.To address this critical limitat... Conventionalpolymeric systems face significant challengesin maintaining performance under hightemperature,high-salinity reservoir conditions due to limited thermal and saline stability.To address this critical limitation,a hydrophobically modified biopolymer(HWLG)was synthesized via etherification of Welan gum(WLG)with 1-bromooctadecane,introducing alkyl grafts to create hydrophobic microdomains.Comprehensivestructural characterization was performed using Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance spectroscopy(NMR),gel permeation chromatography(GPC),thermogravimetryanalysis(TGA),and scanning electron microscopy(SEM),confirmingsuccessful alkylincorporation.Rheological evaluations demonstrated HWLG's concentrationdependent pseudoplasticity,achieving a viscosity of 1423.2 mPa·s at4000 mg.L-1,which was about 3.4 times that of WLG at 70°C.The HWLG solution showed superior temperature and salt resistance in comparison with unmodified WLG,due to hydrophobic association-driven network formation.Particularly in formation water,HWLG showed a better long-term thermal stability,retaining 64.5%viscosity after aging50 d at 70°C,compared to WLG's 39.6%retention.Core flooding experiments validated HWLG's EOR efficacy,delivering 22.6%incremental oil recovery versus WLG's 13.7%,driven by enhanced mobility control.Theintegration of hydrophobic functionality endows HWLG with exceptional thermosaline stability,adsorption capacity,and viscoelasticity,positioning it as a robust candidate for hightemperature,high-salinity reservoir flooding applications. 展开更多
关键词 Hydrophobically modified biopolymer Welan gum Hydrophobic association Temperature and salt resistance Enhanced oil recovery
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Hydromechanical behaviour and strength prediction of xanthan gum-treated unsaturated sandy loam under different suctions 认领 引用
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作者 Junran Zhang Yang Liu +3 位作者 Tong Jiang De'an Sun Hongchen Yan Mengyi Jia 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期3110-3130,共21页
In the Qingshui River area of the Yangtze-Huaihe River water diversion project,sandy loam is abundant and landslides and river leakage are frequent.The conventional treatment of lime and cement leads to poor environme... In the Qingshui River area of the Yangtze-Huaihe River water diversion project,sandy loam is abundant and landslides and river leakage are frequent.The conventional treatment of lime and cement leads to poor environmental outcomes.Xanthan gum(XG)is a biopolymer that is environmentally benign and widely used in soil treatment.Because there are few systematic studies of the triaxial strength and volume change characteristics of XG-treated unsaturated sandy loam,experimental investigations of the water retention behaviour,microstructure,and triaxial shear strength of XG-treated sandy loam were conducted in this study.Test results show that pores of treated soil are filled with XG,which creates fibrous and reticular clusters.Cluster size increases and pore size decreases with increasing proportion of XG in the soil mixture(XG ratio).Xanthan gum treatment improves sandy loam stability and strength.Deviatoric stress–axial strain curves indicate shifts from strain hardening to softening in both treated and untreated soil with increasing suction.Volumetric strain curves indicate shifts from shear contraction to dilatancy.With increasing XG ratio,the degree of shear contraction decreases and the degree of dilatancy increases.Specimens undergo lateral expansion and plastic failure at low suctions and brittle failure along sliding surfaces at high suctions.On the basis of experimental results and the theory of unsaturated soil mechanics,two models were proposed to predict the strength of XG-treated unsaturated sandy loam.The results from this study can be used as the scientific basis for the application of XG-treated sandy loam in the Qingshui River area of the Yangtze-Huaihe River water diversion project. 展开更多
关键词 Xanthan gum Sandy loam Water retention Microstructure Triaxial shear strength Volume change characteristics Strength prediction
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Compressive strength of biopolymer-stabilized residual granitic soil using polybutylene succinate and xanthan gum:A mechanical-microstructural study 认领 引用
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作者 Fazal E.Jalal Mudassir Iqbal +2 位作者 Xiaohua Bao Syed Taseer Abbas Jaffar Xiangsheng Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期673-701,共29页
The biodegradable polybutylene succinate(PBS)material offers a sustainable solution for a circular economy to address the global issue of marine plastic waste.Its cross-linkage with non-biodegradable xanthan gum(XG)bi... The biodegradable polybutylene succinate(PBS)material offers a sustainable solution for a circular economy to address the global issue of marine plastic waste.Its cross-linkage with non-biodegradable xanthan gum(XG)biopolymer to ameliorate residual granitic soil(RGS)in arid and semiarid regions can significantly mitigate soil erosion.This study investigates the enhancement of RGS by cross-linking the PBS and XG biopolymers.Employing a multitude of geotechnical tests(liquid limit,linear shrinkage,specific gravity,compaction,and UCS tests)at 3 d,28 d,and 90 d of steam-curing at a controlled temperature of 16℃,the outcomes were validated through scanning electron microscopy(SEM),thermogravimetric analysis(TGA),Fourier transform infrared spectroscopy(FTIR),and Brunauer-Emmett-Teller(BET)analyses.In addition,a comprehensive experimental database of 150 tests and nine parameters from the current study was utilized to model the UCS90-d(i.e.unconfined compressive strength after 90 d of curing)of the PBS-XG-treated RGS mixtures by deploying the random forest(RF)and eXtreme Gradient Boost(XGBoost)methods.The results found that the two biopolymers significantly improve the mechanical properties of RGS,with optimal UCS achieved at specific dosages(0.4PBS,1.5XG,and 0.2PBS+1.5XG dosage levels)and curing times.The UCS of PBS-XG-treated RGS showed up to a 57%increase after 90 d of curing.Furthermore,SEM and FTIR analyses revealed the formation of stronger microstructures and chemical bonds,respectively,whereas BET analysis indicated that pore volume and diameter are critical in affecting UCS.The proposed RF model outperformed XGBoost in predictive accuracy and generalization,demonstrating robustness and versatility.Moreover,SHAP values highlighted the significant impact of input parameters on UCS90-d,with curing time and specific material properties being key determinants.The study concludes with the proposal of a novel PyCharm intuitive graphical user interface as a"UCS Prediction App"for engineers and practitioners to forecast the UCS90-d of granitic residual soil. 展开更多
关键词 Residual granitic soil Polybutylene succinate Xanthan gum(XG)Unconfined compression strength(UCS) Random forest(RF) eXtreme gradient boost(XGBoost)method
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A Mechanically Robust and Low Heat Build-up Rubber Formed by Isoprene Rubber Assembled with Eucommia Ulmoides Gum via Hydrogen Bonding 认领 引用
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作者 Xin-Yuan Wang Chao-Fan Li +4 位作者 Hai-Lan Kang Dong-Han Li Qing-Hong Fang Long Li Feng Yang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期845-856,I0017,共12页
To combine the high elasticity and good mechanical performance of isoprene rubber(IR)with excellent fatigue resistance and low heat build-up of Eucommia ulmoides gum(EUG),the present study employed a chemical method t... To combine the high elasticity and good mechanical performance of isoprene rubber(IR)with excellent fatigue resistance and low heat build-up of Eucommia ulmoides gum(EUG),the present study employed a chemical method to graft 4-amino pyridine(AP)onto epoxidized IR and EUG,thereby creating a chemical assembly rubber of amino-pyridine-grafted epoxidized IR(AP-EIR)and amino pyridine-grafted epoxidized EUG(AP-EEUG)via a dynamic hydrogen bonding network.The presence of hydrogen bonds between AP-EIR and AP-EEUG was confirmed by variable temperature infrared spectroscopy,whereas scanning electron microscopy-energy dispersive spectroscopy revealed a uniform dispersion of zinc oxide and nano-fillers.Hydrogen bonds significantly facilitate strain-induced crystallization between the AP-EIR and AP-EEUG molecules,thereby strengthening their intermolecular interactions.During mechanical deformation,the material primarily dissipates energy through the breaking of hydrogen bonds,which effectively improves the mechanical strength of the material,and the introduction of amino groups in this chemical assembly rubber improves the uniform dispersion of nano-fillers,as well as the interface interaction between rubber and nano-fillers.Consequently,the chemically assembled rubber exhibited superior modulus,tensile strength,and tear strength compared to IR and its physical blend,while also demonstrating reduced heat build-up during dynamic loading. 展开更多
关键词 Isoprene rubber Eucommia ulmoides gum Hydrogen bond Chemically assemble
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Effect of Modified Gum Arabic and Euphorbia Trigona Mill Master Batch on the Crystallization and Thermal Stability of Poly(Lactic Acid) 认领 引用
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作者 Kasahun Tsegaye Mekonnen Melaku Tesfaye Alemea +2 位作者 Dessie Ezez Abenezer Zenebe Negussie Darota Daka 《Journal of Renewable Materials》 EI CAS 2026年第5期187-204,共18页
This study examined the effects of modified Gum Arabic(OLLA-g-GA),modified Euphorbia trigona Mill(OLLA-g-ETML),and their master batch(OLLA-g-GA-OLLA-g-ETML)on the non-isothermal crystallisation and thermal stability o... This study examined the effects of modified Gum Arabic(OLLA-g-GA),modified Euphorbia trigona Mill(OLLA-g-ETML),and their master batch(OLLA-g-GA-OLLA-g-ETML)on the non-isothermal crystallisation and thermal stability of poly(lactic acid)(PLA).The interface interactions of PLA with the modifiers before and after modification were analysed and identified using FTIR spectroscopy,which displayed different peak formations and intensities compared to neat PLA,indicating physical interactions with the modifiers.Differential scanning calorimetry(DSC)was used to study non-isothermal crystallisation at a heating rate of 10○C/min.Tensile strength and elongation at break of PLA improved by the addition of biofiller.The incorporation of OLLA-g-GA,OLLA-g-ETML,and their master batch enhanced the crystallinity enhancement to 39.32%,36.30%,and 40.39%,respectively,from 31.36%(for neat PLA)to 35.28%.Thermal annealing increased the crystallinity of the PLA/master batch composites to 45.83%.These findings confirm that blending PLA with modified gum Arabica,Euphorbia trigona Mill,and master batch had a positive effect on the crystallisation and thermal stability of PLA,demonstrating a successful methodology for improving the performance of biodegradable polymer composites. 展开更多
关键词 Gum Arabic euphoria trigona mill master batch thermal stability poly(lactic acid)
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Bio-Based Foams from Agricultural Waste:Optimizing Corn Starch-Corn Husk Composites with Xanthan Gum for Cushioning Applications 认领 引用
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作者 Manisara Phiriyawirut Kanbhanu Wachararuangroong +1 位作者 Manisara Wongsaroj Napat Arompijit 《Journal of Renewable Materials》 EI CAS 2026年第3期148-164,共17页
With the escalating environmental impact of petrochemical-based packaging,the development of biodegradable alternatives from agricultural waste has become imperative.This study describes the fabrication and optimizati... With the escalating environmental impact of petrochemical-based packaging,the development of biodegradable alternatives from agricultural waste has become imperative.This study describes the fabrication and optimization of a sustainable,bio-based cushioning material derived from a corn starch foam matrix and corn husk fibers via compression molding.The investigation of starch ratios revealed that 100%normal corn starch(NCS)provided superior expansion and structural integrity compared to waxy starch,which exhibited significant cell wall collapse under SEM analysis.To enhance formability,xanthan gum(XG)was incorporated as a stabilizer;a 1.0%(w/w)concentration was found to be the morphological inflection point,yielding a refined closed-cell structure and a bulk density of 0.43 g/cm3.The stabilized matrix was reinforced with 2.0%to 6.0%(w/w)corn husk fibers pre-treated with tetraethoxy silane(TEOS)to improve interfacial adhesion.The addition of 6.0%fibers significantly augmented the material’s energy absorption capacity,achieving a peak impact strength of 1.87±0.50 kJ/m2and a compressive strength of 0.56 N/mm2.These results demonstrate that the optimized agricultural waste-derived composite effectively surpasses the load-bearing capabilities of traditional commercial foams,offering a viable,eco-friendly solution for high-load protective packaging. 展开更多
关键词 Starch foam corn starch corn husk fiber xanthan gum waxy corn starch
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关于流量计量中GUM法不确定度规范使用的探讨 认领 引用
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作者 邹海波 《中国计量》 2026年第1期153-157,共5页
文章依据JJF 1059.1—2012《测量不确定度评定与表示》,采用GUM法评定了电磁流量计相对示值误差的不确定度。通过分析指出,测量结果为示值误差或相对示值误差时,不能使用相对标准不确定度的表示形式,并明确了不确定度应与测量结果的量... 文章依据JJF 1059.1—2012《测量不确定度评定与表示》,采用GUM法评定了电磁流量计相对示值误差的不确定度。通过分析指出,测量结果为示值误差或相对示值误差时,不能使用相对标准不确定度的表示形式,并明确了不确定度应与测量结果的量纲统一以及规范使用不确定度表述形式的重要性。 展开更多
关键词 流量计量 GUM法不确定度评定 相对标准不确定度 测量结果 示值误差 灵敏系数
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Mechanical and disintegration properties of solidified loess mixed with gellan gum and guar gum 认领 引用
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作者 SONG Bingjie ZHANG Hong +1 位作者 ZHAO Xin YANG Yuntao 《Journal of Mountain Science》 SCIE CSCD 2025年第8期3123-3138,共16页
Loess slopes in cold and arid regions are susceptible to shallow soil degradation,which may trigger severe environmental problems related to soil erosion.To address this environmental challenge,this study selected a c... Loess slopes in cold and arid regions are susceptible to shallow soil degradation,which may trigger severe environmental problems related to soil erosion.To address this environmental challenge,this study selected a compound ecological curing agent composed of gellan gum and guar gum for stabilizing shallow loess slopes.Triaxial compression and disintegration tests were employed to comparatively analyze the effects of compound gum content,mass mix ratio,and curing age on the mechanical and disintegration properties of solidified loess.The curing mechanism was analyzed using scanning electron microscopy(SEM),and the ecological protection effect was monitored for a 60-day period.The results indicate that gellan gum,guar gum,and the compound gum can enhance the mechanical and disintegration properties of loess,promote plant growth,and optimize the ecological environment.However,the combination of gellan gum and guar gum proves more effective than using either gellan gum or guar gum alone.Considering the effects on mechanical properties,disintegration performance,and material economy,the disintegration rate of loess decreases by 75.72%compared to plain loess when the compound glue content is 0.5%,the mixing ratio of gellan gum to guar gum is 3:7 and the curing age is 7 days.Meanwhile,the cohesion and internal friction angle increase by 118.06%and 10.97%,respectively.Moreover,the disintegration performance and mechanical properties of the samples first increase and then decrease with the increase in compound glue and the mix ratio and are basically stabilized after the curing age reaches 7d. 展开更多
关键词 Solidified loess Gellan gum Guar gum Mechanical property Disintegration performance Slope protection
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Dynamic deformation characteristics and microscopic analysis of xanthan gum-treated silty soil during wetting process 认领 引用 被引量：6
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作者 Junran Zhang Mengyi Jia +4 位作者 Tong Jiang Shoji Kato De'an Sun You Gao Zheng Yang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第2期1149-1162,共14页
The deformation characteristics of silty soils under vibrational loads can easily change due to the wetting process,leading to the failure of roadbed structures.Commonly used methods for improving silty soils in engin... The deformation characteristics of silty soils under vibrational loads can easily change due to the wetting process,leading to the failure of roadbed structures.Commonly used methods for improving silty soils in engineering often yield unsatisfactory economic and ecological outcomes.As an environment-friendly soil improvement material,Xanthan gum has broad application prospects and is therefore considered a solidifying agent for enhancing silty soil properties in the Yellow River Basin.In this study,a series of tests is conducted using a scanning electron microscope and a dynamic triaxial testing apparatus to investigate the microstructure and dynamic deformation characteristics of unsaturated silty soil with varying xanthan gum contents during the wetting process.The results show that xanthan gum effectively fills voids between soil particles and adheres to their surfaces,forming fibrous and network structures.This modification enhances the inherent properties of the silty soil and significantly improves its stability under dynamic loading.Specifically,with increasing xanthan gum content,the dynamic shear modulus increases while the damping ratio decreases.During the wetting process,as suction decreases,the dynamic shear modulus decreases while the damping ratio increases.Xanthan gum reduces the sensitivity of the dynamic deformation characteristics of the treated silty soil to changes in suction levels.Finally,based on the modified Hardin-Drnevich hyperbolic model,a predictive model for the dynamic shear modulus and damping ratio of treated silty soil is proposed,considering the xanthan gum content.These research findings provide a theoretical basis for the construction and maintenance of water conservancy,slope stabilization,and roadbed projects in the Yellow River Basin. 展开更多
关键词 Xanthan gum Unsaturated silty soil dynamic deformation characteristics Scanning electron microscope Water retention characteristics
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Effects of xanthan gum treatment on sedimentation and consolidation of kaolinite aggregates 认领 引用
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作者 Yeong-Man Kwon Gye-Chun Cho Ilhan Chang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第11期7288-7296,共9页
Understanding the sedimentation and simultaneous consolidation behavior of xanthan gum(XG)-biopolymer-treated soils remains a significant research gap in developing environmentally friendly ground-improvement techniqu... Understanding the sedimentation and simultaneous consolidation behavior of xanthan gum(XG)-biopolymer-treated soils remains a significant research gap in developing environmentally friendly ground-improvement techniques for geotechnical applications.This study addresses this gap by conducting laboratory experiments on kaolinite suspensions with varying XG-to-kaolinite mass ratios(mb/ms).The results showed that the XG treatment modified the sedimentation patterns by promoting larger floc formation and accelerated settling.Additionally,the XG treatment enhanced the shear stiffness and shear strength,particularly at shallow depths.At mb/ms ratios less than 1%,the volume compression was reduced by the XG;the coefficient of compressibility decreased by 49%at 1%mb/ms,and the consolidation was accelerated,as indicated by a 387%increase in the hydraulic conductivity at 0.5%mb/ms under the vertical effective stress of 40 kPa.Contrastingly,at mb/ms ratios greater than 1%,viscous XG hydrogels clogged pores,resulting in a 45%reduction in the coefficient of consolidation at 2%mb/ms under a vertical effective stress of 15 kPa and a 35%decrease in the hydraulic conductivity at 2%mb/ms under a vertical effective stress of 40 kPa.These findings underscore the potential of XG treatment in improving the sedimentation and consolidation processes,highlighting its applicability in geotechnical projects,such as dredging,landfilling,and artificial island construction. 展开更多
关键词 Clays Biopolymer Xanthan gum Consolidation Sedimentation
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Influence and mechanism of xanthan gum on the aggregation and flotation behavior of talc,olivine,and serpentine 认领 引用
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作者 YANG Xu-sheng FENG Bo +1 位作者 WANG Zi-ming JIANG Long-xia 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第7期2463-2475,共13页
Finding appropriate flotation reagents to separate copper-nickel sulfide ores from various magnesium silicate gangue minerals has always been a challenge in the mineral processing industry.This study introduced xantha... Finding appropriate flotation reagents to separate copper-nickel sulfide ores from various magnesium silicate gangue minerals has always been a challenge in the mineral processing industry.This study introduced xanthan gum(XG)as a non-toxic and environmentally friendly depressant of talc,olivine,and serpentine.The effects and mechanisms of XG on the aggregation and flotation behavior of talc,olivine and serpentine were investigated by flotation tests,sedimentation tests,IC-FBRM particle size analysis tests,adsorption quantity tests,Fourier transform infrared spectroscopy(FTIR)tests,X-ray photoelectron spectroscopy(XPS)analysis tests and Zeta potential tests.The flotation results indicated that when the three minerals were mixed,XG caused the talc-serpentine aggregation in the solution to shift to olivine-serpentine aggregation,with the remaining XG adsorbing on talc to depress its flotation.In addition,combining XPS and zeta potential tests,the-OH(hydroxyl)groups in XG molecules preferentially adsorbed on Mg sites on the surface of olivine through chemical bonding.The surface potential of olivine significantly shifted to a more negative value,with the negative charge on the olivine surface far exceeding that on the talc surface.This resulted in an increased aggregation effect between positively charged serpentine and negatively charged olivine due to enhanced electrostatic forces. 展开更多
关键词 flotation reagents copper-nickel suifide magnesium silicate gangue minerals xanthan gum aggregation mechanisms potential
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Differential adsorption of gum Arabic as an eco -friendly depressant for the selective flotation of chalcopyrite from molybdenite 认领 引用 被引量：2
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作者 Tao Chen Runqing Liu +2 位作者 Wenchao Dong Min Wei Wei Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第8期1838-1847,共10页
The environment-friendly and efficient selective separation of chalcopyrite and molybdenite poses a challenge in mineral pro-cessing.In this study,gum Arabic(GA)was initially proposed as a novel depressant for the sel... The environment-friendly and efficient selective separation of chalcopyrite and molybdenite poses a challenge in mineral pro-cessing.In this study,gum Arabic(GA)was initially proposed as a novel depressant for the selective separation of molybdenite from chalcopyrite during flotation.Microflotation results indicated that the inhibitory capacity of GA was stronger toward molybdenite than chalcopyrite.At pH 8.0 with 20 mg/L GA addition,the recovery rate of chalcopyrite in the concentrate obtained from mixed mineral flota-tion was 67.49%higher than that of molybdenite.Furthermore,the mechanism of GA was systematically investigated by various surface characterization techniques.Contact angle tests indicated that after GA treatment,the hydrophobicity of the molybdenite surface signifi-cantly decreased,but that of the chalcopyrite surface showed no apparent change.Fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy revealed a weak interaction force between GA and chalcopyrite.By contrast,GA was primarily adsorbed onto the molybdenite surface through chemical chelation,with possible contributions from hydrogen bonding and hydrophobic interactions.Pre-adsorbed GA could prevent butyl xanthate from being adsorbed onto molybdenite.Scanning electron microscopy–energy-dispersive spectrometry further indicated that GA was primarily adsorbed onto the“face”of molybdenite rather than the“edge.”Therefore,GA could be a promising molybdenite depressant for the flotation separation of Cu–Mo. 展开更多
关键词 selectively separation gum Arabic chalcopyrite molybdenite
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Dual Cross-linked Eucommia Ulmoides Gum with Reprocessibility,Shape Memory Capability and Broadband Sound Absorption at Low Frequency 认领 引用
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作者 Qing-Gang Ni Rui Mi +4 位作者 Biao Ou-Yang Jian-Hua Wu Peng Kong You-Ji Li Xiao-Chun Peng 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第10期1875-1884,共10页
An inverse vulcanized polymer,SZIM combining Zn2+-imidazole coordination bonds and polysulfide bonds was synthesized and incorporated into bio-based Eucommia ulmoides gum (EUG) to generate EUG-SZIM-xs.The residual cry... An inverse vulcanized polymer,SZIM combining Zn2+-imidazole coordination bonds and polysulfide bonds was synthesized and incorporated into bio-based Eucommia ulmoides gum (EUG) to generate EUG-SZIM-xs.The residual crystallinity of the EUG matrix synergistically interacted with the dual cross-linking networks to establish reversible deformation domains,providing EUG-SZIM-xs with quick shape memory capability at moderate temperatures.The damping properties were also investigated,and EUG-SZIM-xs displayed high tanδ values (>0.3) when the SZIM dosage was higher than 5.5 phr,which showed a positive correlation with SZIM concentration.Such good damping performance endowed the EUG-SZIM-xs with broadband low-frequency sound absorption.In addition,the dual cross-linking networks endowed the materials with reprocessability under different catalytic systems,and the 1,8-diazobicyclic[5.4.0]undeca-7-ene (DBU)-catalyzed samples exhibited better mechanical properties than EUG-SZIM-xs. 展开更多
关键词 Eucommia ulmoides gum Inverse vulcanization Shape memory capability Reprocessibility Sound absorption
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Characterization,In Vitro Dissolution,and Drug Release Kinetics in Hard Capsule Shells Made from Hydrolyzed κ-Carrageenan and Xanthan Gum 认领 引用
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作者 Tri Susanti Syahnur Haqiqoh +4 位作者 Pratiwi Pudjiastuti Siti Wafiroh Esti Hendradi Oktavia Eka Puspita Nashriq Jailani 《Journal of Renewable Materials》 EI CAS 2025年第9期1841-1857,共17页
This study aims to enhance the mechanical properties,disintegration,and dissolution rates of crosslinked carrageenan(CRG)capsule shells by shortening the long chains of CRG through a hydrolysis reaction with citric ac... This study aims to enhance the mechanical properties,disintegration,and dissolution rates of crosslinked carrageenan(CRG)capsule shells by shortening the long chains of CRG through a hydrolysis reaction with citric acid(CA).The hydrolysis of CRG was carried out using varying concentrations of CA,resulting in hydrolyzed CRG(HCRG).This was followed by cross-linking with xanthan gum(XG)and the addition of sorbitol(SOR)as a plasticizer.The results indicated that the optimal swelling capacity of HCRG-XG/SOR hard-shell capsules occurred at a CA concentration of 0.5%,achieving a maximum swelling rate of 445.39%after 15 min.Additionally,the best capsule hardness was alsomeasured at this CA concentration,reaching a hardness level of 480.157 g(F=4.67 N).FTIR analysis demonstrated that the presence of the acid group from CA altered the composition of the CRG chains.Furthermore,SEM-EDX mapping analysis revealed that the surface morphology of the synthesized capsules exhibited a relatively smooth texture with a limited number and size of pores,resulting in good capsule stability for drug delivery.Thein vitro disintegration and dissolution rates of theHCRG-XG/SOR capsuleswere observed to be the fastest and highest atpH1.2,respectively.The disintegration time was recorded at 20 min and 46 s,while the dissolution test indicated a drug release of 78.08%after 5min and 100%after 120 min.The drug delivery kinetics ofHCRG-XG/SOR followed the Ritger-Peppas model,indicating a complex release mechanism that involved swelling,diffusion,erosion,and capsule disintegration. 展开更多
关键词 Carrageenan xanthan gum hard-shell capsules natural polymer drug delivery system
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Facile Preparation of Robust Peach Gum Polysaccharide with Remarkably Enhanced Antibacterial and Antioxidant Performance 认领 引用
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作者 Mengting Huang Meiting Lu +2 位作者 Li Yang Jiwen Long Li Zhou 《Journal of Renewable Materials》 EI CAS 2025年第10期2077-2090,共14页
Peach gum polysaccharide(PGP),a readily available natural polysaccharide,boasts substantial potential across diverse applications,yet its practical utility is severely limited by its vulnerability to bacterial growth ... Peach gum polysaccharide(PGP),a readily available natural polysaccharide,boasts substantial potential across diverse applications,yet its practical utility is severely limited by its vulnerability to bacterial growth and limited antioxidant activity.Herein,we introduced a simple and effective method to enhance the antibacterial and antioxidant properties of PGP by conjugating it with salicylic acid(SA).Cytotoxicity evaluation results confirmed that the resulting PGP-SA retains the excellent biocompatibility of PGP.Notably,PGP-SA demonstrates outstanding antibacterial activity against both Gram-positive(S.aureus)and Gram-negative(E.coli)bacteria,outperforming non-modified PGP.Its antibacterial mechanism is hypothesized to stem from disrupting bacterial cell membranes and proteins,targeting structures vital to microbial survival.Beyond fighting bacteria,PGP-SA also delivers robust antioxidant activity,efficiently scavenging ABTS radicals.Harnessing these dual enhancements,PGP-SA proves highly effective as a fruit preservation coating.Most impressively,it extends the post-harvest shelf life of mangoes:under identical storage conditions,PGP-SA-coatedmangoes stay fresh for seven extra days compared to uncoated fruit.With its simple synthesis process and standout performance,this work not only overcomes PGP’s key limitations but also opens new avenues for its application in food preservation and related industries. 展开更多
关键词 Peach gum polysaccharide salicylic acid antibacterial activity antioxidant activity food preservation
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基于GUM法的CTD温度校准不确定度评定 认领 引用
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作者 刘淑婷 王存涛 +1 位作者 辛阿阿 孙蕾 《中国计量》 2025年第8期124-128,共5页
温盐深测量仪(CTD)作为海洋环境监测的重要仪器需定期校准,校准不确定度对保证其测量准确性具有重要意义。文章按照GUM法不确定度评定方法对实验室CTD温度校准实例进行温度校准实验不确定度来源分析,并计算各不确定度分量值,得到CTD实... 温盐深测量仪(CTD)作为海洋环境监测的重要仪器需定期校准,校准不确定度对保证其测量准确性具有重要意义。文章按照GUM法不确定度评定方法对实验室CTD温度校准实例进行温度校准实验不确定度来源分析,并计算各不确定度分量值,得到CTD实验室温度校准不确定度。通过不确定度分析,得出用于校准的标准装置和被校设备在校准过程中对结果的不确定度影响较大,因此对于CTD温度校准的不确定度评价,不同等级标准装置和被校设备的选择非常重要。 展开更多
关键词 计量学 CTD 校准 GUM 不确定度
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Effect of Gum Arabic from Acacia senegal var. kerensis and Texturized Soy Protein on Pysico-Chemical Properties of Protein-Rich Snack Stick 认领 引用
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作者 Edward Mukundi Njeru Mary Omwamba Symon Maina Mahungu 《Food and Nutrition Sciences》 CAS 2025年第1期28-43,共16页
Protein-energy malnutrition (PEM) as a result of poor nutrition, especially for deprived resourced households, is a big health concern in the world. According to the World Health Organisation, PEM accounts for 49% of ... Protein-energy malnutrition (PEM) as a result of poor nutrition, especially for deprived resourced households, is a big health concern in the world. According to the World Health Organisation, PEM accounts for 49% of the 10.4 million deaths of children under five that take place in developing countries. The aim of this study was to evaluate the influence of gum Arabic (GA) and texturized soy protein (TSP) and their interactive effect on proximate, functional, and textural properties of the protein-rich snack stick produced from ground green maize, GA powder, and ground TSP. GA varied at 0%, 4%, 8%, and 12%, while TSP varied at 0%, 12%, 24% and 36%. The 5 cm long protein-rich snack sticks were made using a sausage stuffer and baked in an oven at 110˚C for 1 hr 30 minutes. The snack sticks were subjected to proximate, functional and textural analysis using the standard methods. Increasing GA resulted in a significant (p p < 0.05) increased the protein content (32.46%), Ash content (3.6%), fat (11.96%), and moisture content (16.25%) of protein-rich snack sticks. The interactive effect between GA and TSP led to a decrease in fibre and carbohydrates. Results from this study show GA and TSP significantly enhanced the physico-chemical properties of protein-rich snack sticks. A sample with 4% GA and 36% TSP is recommended for the best physico-chemical attributes of the protein-rich snack stick. 展开更多
关键词 Gum Arabic Protein Snack Hydrocolloids Nutrition
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Strength properties of xanthan gum and guar gum treated kaolin at different water contents 认领 引用 被引量：16
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作者 Irem Bozyigit Akbar Javadi Selim Altun 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2021年第5期1160-1172,共13页
Nowadays,using biopolymer as a ground improvement method has become very popular.However,since biopolymers are organic and degradable,their long-term effect is not fully known.In this study,the effects of biopolymers ... Nowadays,using biopolymer as a ground improvement method has become very popular.However,since biopolymers are organic and degradable,their long-term effect is not fully known.In this study,the effects of biopolymers on the mechanical behavior of kaolin clay were investigated through a comprehensive program of experiments.Two types of biopolymer,i.e.xanthan gum and guar gum were chosen to investigate the effect of biopolymer type.For this purpose,specimens were prepared using standard Proctor energy at four different water contents(25%,30%35%and 40%)with 0.5%,1%,1.5%and 2%biopolymer inclusions.The specimens were cured for 1 d,7 d,28 d and 90 d.Moreover,some of the specimens were kept in the curing room for 3 years to observe the long-term effect of the biopolymers.At the end of the curing periods,the specimens were subjected to unconfined compression test,and scanning electron microscopy(SEM)analysis was performed to observe the mechanism of strength improvement.The results revealed that the unconfined compressive strength(UCS)of the specimens treated with biopolymers increased in all biopolymer inclusion levels and water contents up to a 90-d curing period.For specimens containing xanthan gum,the maximum strength increase was observed at 25%water content and 2%xanthan gum with 90-d curing.The strength increased 5.23 times induced by xanthan gum addition when compared to the pure clay.Moreover,the increase in strength reached 8.53 times in specimens treated with guar gum.Besides,increasing water content caused more ductile behavior,thus increasing the axial deformation. 展开更多
关键词 Biopolymer Clay Unconfined compressive strength(UCS) Xanthan gum Guar gum Strength properties
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Integrated transcriptomic and metabolic analyses reveal that ethylene enhances peach susceptibility to Lasiodiplodia theobromae-induced gummosis 认领 引用 被引量：3
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作者 Dongmei Zhang Xingyi Shen +7 位作者 He Zhang Xue Huang Hanzi He Junli Ye Francesca Cardinale Jihong Liu Junwei Liu Guohuai Li 《Horticulture Research》 SCIE CSCD 2022年第1期560-575,共16页
Gummosis,one of the most detrimental diseases to the peach industryworldwide,can be induced by Lasiodiplodia theobromae.Ethylene(ET)is known to trigger the production of gum exudates,but the mechanism underlying fungu... Gummosis,one of the most detrimental diseases to the peach industryworldwide,can be induced by Lasiodiplodia theobromae.Ethylene(ET)is known to trigger the production of gum exudates,but the mechanism underlying fungus-induced gummosis remains unclear.In this study,L.theobromae infection triggered the accumulation of ET and jasmonic acid(JA)but not salicylic acid(SA)in a susceptible peach variety.Gaseous ET and its biosynthetic precursor increased gum formation,whereas ET inhibitors repressed it.SA andmethyljasmonate treatments did not influence gum formation.RNA-seq analysis indicated that L.theobromae infection and ET treatment induced a shared subset of 1808 differentially expressed genes,which were enriched in the category“starch and sucrose,UDP-sugars metabolism”.Metabolic and transcriptional profiling identified a pronounced role of ET in promoting the transformation of primary sugars(sucrose,fructose,and glucose)into UDP-sugars,which are substrates of gum polysaccharide biosynthesis.Furthermore,ethylene insensitive3-like1(EIL1),a key transcription factor in the ET pathway,could directly target the promoters of the UDP-sugar biosynthetic genes UXS1a,UXE,RGP and MPI and activate their transcription,as revealed by firef ly luciferase and yeast one-hybrid assays.On the other hand,the supply of SA and inhibitors of ET and JA decreased the lesion size.ET treatment reduced JA levels and the transcription of the JA biosynthetic gene OPR but increased the SA content and the expression of its biosynthetic gene PAL.Overall,we suggest that endogenous and exogenous ET aggravate gummosis disease by transactivating UDP-sugar metabolic genes through EIL1 and modulating JA and SA biosynthesis in L.theobromae-infected peach shoots.Our findings shed light on themolecular mechanism by which ET regulates plant defense responses in peach during L.theobromae infection. 展开更多
关键词 lasiodiplodia theobromaeethylene et transcriptional regulation gum exudatesbut salicylic acid sa biosynthetic precursor gummosis jasmonic acid ja Lasiodiplodia theobromae
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MCM法和GUM法评定燃气表测量误差不确定度的对比研究 认领 引用
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作者 牛娜 《中国计量》 2025年第4期144-148,共5页
燃气表作为民用“四表”之一,其检定结果对燃气表用户的安全和利益影响重大,检定的各个环节需严格把关。文章重点对燃气表测量误差不确定度进行了研究,旨在通过对比分析采用蒙特卡罗法(MCM)和测量不确定度评定法(GUM)在燃气表测量不确... 燃气表作为民用“四表”之一,其检定结果对燃气表用户的安全和利益影响重大,检定的各个环节需严格把关。文章重点对燃气表测量误差不确定度进行了研究,旨在通过对比分析采用蒙特卡罗法(MCM)和测量不确定度评定法(GUM)在燃气表测量不确定度评定中的应用效果;对燃气表测量值的相关性进行了分析,并提出了针对性的解决方法。同时,文章对评定结果进行了多方面的比较和论证,并对输入量相关性进行了研究。结果表明,MCM法更适用于燃气表测量误差不确定度评定。 展开更多
关键词 计量学 燃气表 测量不确定度 MCM法 GUM法
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