为了研究金枪鱼在冷藏期间的水分迁移与脂肪酸变化的相关性,采用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析金枪鱼肉组织中水分变化规律。横向弛豫时间T2分析结果表明:随着贮藏时间的延长,表征不易流动水的T2...为了研究金枪鱼在冷藏期间的水分迁移与脂肪酸变化的相关性,采用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析金枪鱼肉组织中水分变化规律。横向弛豫时间T2分析结果表明:随着贮藏时间的延长,表征不易流动水的T21逐渐降低,表征自由水的T22逐渐升高。理化指标测定结果显示:随着贮藏时间延长,pH值先下降后上升,硫代巴比妥酸值呈上升趋势,而aw、水分含量不断下降,金枪鱼肉品质下降。相关性分析结果表明:表征强结合水的T2b与C18:0、二十碳五烯酸含量呈显著负相关(P<0.05),T21与二十二碳六烯酸含量呈极显著正相关(P<0.01),T22与C18:0、C18:1n9c含量分别呈极显著(P<0.01)和显著(P<0.05)正相关。因此,可考虑运用LF-NMR技术检测金枪鱼在冷藏期间检测脂肪酸含量的变化,从而表征其品质劣变的程度。展开更多
Low-temperature storage is extensively used to optimize the postharvest life of various fresh fruits.However,red pitahaya(Hylocereus polyrhizus)fruits are sensitive to chilling injury(CI),which leads to the limitation...Low-temperature storage is extensively used to optimize the postharvest life of various fresh fruits.However,red pitahaya(Hylocereus polyrhizus)fruits are sensitive to chilling injury(CI),which leads to the limitation of low-temperature storage.In this study,red pitahaya fruits were stored at 2,4,6,8,and 10℃,respectively,for 27 days to determine the appropriate storage temperature.During the storage of red pitahaya fruits,storage at 8℃ was more effective in suppressing decay and maintaining quality than other low temperatures.Lowtemperature(2,4,and 6℃)storage decreased weight loss(WL)and maintained higher content of titratable acidity(TA),soluble sugars(SS),and total phenolics(TP)but different degrees of CI were detected.No CI was observed at 8℃ and 10℃.Red pitahay as stored at 8 and 10℃ were associated with better color evaluation,lower electrolyte leakage(EL),respiration rate,and lipoxygenase(LOX)activity,and higher fruit firmness,superoxide dismutase(SOD)activity,and catalase(CAT)activity.However,higher storage temperature(10℃)resulted in higher metabolic activity leading to lower quality and antioxidant capacities compared with 8℃.Therefore,our results demonstrated that red pitahaya stored at 8℃ exhibited a protective effect on fruit quality and resisted CI development during storage.展开更多
摘要为了研究金枪鱼在冷藏期间的水分迁移与脂肪酸变化的相关性,采用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析金枪鱼肉组织中水分变化规律。横向弛豫时间T2分析结果表明:随着贮藏时间的延长,表征不易流动水的T21逐渐降低,表征自由水的T22逐渐升高。理化指标测定结果显示:随着贮藏时间延长,pH值先下降后上升,硫代巴比妥酸值呈上升趋势,而aw、水分含量不断下降,金枪鱼肉品质下降。相关性分析结果表明:表征强结合水的T2b与C18:0、二十碳五烯酸含量呈显著负相关(P<0.05),T21与二十二碳六烯酸含量呈极显著正相关(P<0.01),T22与C18:0、C18:1n9c含量分别呈极显著(P<0.01)和显著(P<0.05)正相关。因此,可考虑运用LF-NMR技术检测金枪鱼在冷藏期间检测脂肪酸含量的变化,从而表征其品质劣变的程度。
基金J.X.and J.M.gratefully acknowledge the funding from Key Project of Science and Technology Commission of Shanghai Municipality,Grant No.19395800100Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation,Grant No.17DZ2293400.
摘要Low-temperature storage is extensively used to optimize the postharvest life of various fresh fruits.However,red pitahaya(Hylocereus polyrhizus)fruits are sensitive to chilling injury(CI),which leads to the limitation of low-temperature storage.In this study,red pitahaya fruits were stored at 2,4,6,8,and 10℃,respectively,for 27 days to determine the appropriate storage temperature.During the storage of red pitahaya fruits,storage at 8℃ was more effective in suppressing decay and maintaining quality than other low temperatures.Lowtemperature(2,4,and 6℃)storage decreased weight loss(WL)and maintained higher content of titratable acidity(TA),soluble sugars(SS),and total phenolics(TP)but different degrees of CI were detected.No CI was observed at 8℃ and 10℃.Red pitahay as stored at 8 and 10℃ were associated with better color evaluation,lower electrolyte leakage(EL),respiration rate,and lipoxygenase(LOX)activity,and higher fruit firmness,superoxide dismutase(SOD)activity,and catalase(CAT)activity.However,higher storage temperature(10℃)resulted in higher metabolic activity leading to lower quality and antioxidant capacities compared with 8℃.Therefore,our results demonstrated that red pitahaya stored at 8℃ exhibited a protective effect on fruit quality and resisted CI development during storage.