为探讨光照对低温贮藏下非浓缩还原(not from concentrate, NFC)鲜榨橙汁品质的影响,以聚对苯二甲酸乙二醇酯透明包装的NFC鲜榨橙汁成品为试验材料,研究光照对低温贮藏NFC鲜榨橙汁的维生素C、5-羟甲基糠醛、有机酸、柠檬苦素以及挥发性...为探讨光照对低温贮藏下非浓缩还原(not from concentrate, NFC)鲜榨橙汁品质的影响,以聚对苯二甲酸乙二醇酯透明包装的NFC鲜榨橙汁成品为试验材料,研究光照对低温贮藏NFC鲜榨橙汁的维生素C、5-羟甲基糠醛、有机酸、柠檬苦素以及挥发性成分等品质指标的影响。结果表明,与光照处理相比,避光显著减少了低温贮藏的NFC鲜榨橙汁中维生素C、奎尼酸和苹果酸的损失,显著降低了柠檬苦素生成,改变了特征挥发性物质(β-月桂烯、D-柠檬烯、丁酸乙酯、己酸乙酯、己醛、壬醛和癸醛)的浓度。因此,避光有利于保持低温贮藏下NFC鲜榨橙汁的品质,建议企业采用避光材料包装产品,或者透光材料包装的产品在货架销售期间尽量在避光条件下存放。展开更多
Kiwifruit(Actinidia deliciosa)‘Bruno’is prone to accumulate ethanol rapidly after respiratory climacteric during storage at ambient conditions without stresses,which causes quality deterioration of the fruit associa...Kiwifruit(Actinidia deliciosa)‘Bruno’is prone to accumulate ethanol rapidly after respiratory climacteric during storage at ambient conditions without stresses,which causes quality deterioration of the fruit associated with alcohol off-flavor.For maintaining the postharvest quality of kiwifruit‘Bruno’,the effects of 1.0μL•L^−11-methylcyclopropene(1-MCP)treatment on regulating the ethanol fermentation andγ-aminobutyric acid(GABA)shunt pathway associated with control of alcohol off-flavor were investigated during storage at room temperature(24±1)°C for 27 days.The results showed that 1-MCP treatment significantly reduced the respiration rate,ethylene production,decay rate,ascorbic acid(AsA)loss,and delayed the decline in the firmness and titratable acidity(TA),and the increase in total soluble solid(TSS)in kiwifruit.Furthermore,1-MCP treatment effectively inhibited the increases in contents of acetaldehyde,ethanol,and GABA along with the suppressed activities of key enzymes involved in ethanol fermentation and GABA shunt pathway,such as pyruvate decarboxylase(PDC),alcohol dehydrogenase(ADH),glutamate decarboxylase(GAD),and GABA-transaminase(GABA-T)in kiwifruit during storage.In conclusion,1-MCP treatment efficiently regulated the ethanol fermentation and GABA shunt pathway by delaying the ripening process to avoid the alcohol off-flavor development,thereby contributed to maintaining the quality of the kiwifruit.展开更多
文摘为探讨光照对低温贮藏下非浓缩还原(not from concentrate, NFC)鲜榨橙汁品质的影响,以聚对苯二甲酸乙二醇酯透明包装的NFC鲜榨橙汁成品为试验材料,研究光照对低温贮藏NFC鲜榨橙汁的维生素C、5-羟甲基糠醛、有机酸、柠檬苦素以及挥发性成分等品质指标的影响。结果表明,与光照处理相比,避光显著减少了低温贮藏的NFC鲜榨橙汁中维生素C、奎尼酸和苹果酸的损失,显著降低了柠檬苦素生成,改变了特征挥发性物质(β-月桂烯、D-柠檬烯、丁酸乙酯、己酸乙酯、己醛、壬醛和癸醛)的浓度。因此,避光有利于保持低温贮藏下NFC鲜榨橙汁的品质,建议企业采用避光材料包装产品,或者透光材料包装的产品在货架销售期间尽量在避光条件下存放。
基金The research was supported by Natural Science Foundation of Zhejiang Province for youth(Grant No.LQ19C200004)the National Natural Science Foundation(Grant No.31671908)the Science and Technology Planning Project of Linhai City(Grant No.2018SHJH04).
文摘Kiwifruit(Actinidia deliciosa)‘Bruno’is prone to accumulate ethanol rapidly after respiratory climacteric during storage at ambient conditions without stresses,which causes quality deterioration of the fruit associated with alcohol off-flavor.For maintaining the postharvest quality of kiwifruit‘Bruno’,the effects of 1.0μL•L^−11-methylcyclopropene(1-MCP)treatment on regulating the ethanol fermentation andγ-aminobutyric acid(GABA)shunt pathway associated with control of alcohol off-flavor were investigated during storage at room temperature(24±1)°C for 27 days.The results showed that 1-MCP treatment significantly reduced the respiration rate,ethylene production,decay rate,ascorbic acid(AsA)loss,and delayed the decline in the firmness and titratable acidity(TA),and the increase in total soluble solid(TSS)in kiwifruit.Furthermore,1-MCP treatment effectively inhibited the increases in contents of acetaldehyde,ethanol,and GABA along with the suppressed activities of key enzymes involved in ethanol fermentation and GABA shunt pathway,such as pyruvate decarboxylase(PDC),alcohol dehydrogenase(ADH),glutamate decarboxylase(GAD),and GABA-transaminase(GABA-T)in kiwifruit during storage.In conclusion,1-MCP treatment efficiently regulated the ethanol fermentation and GABA shunt pathway by delaying the ripening process to avoid the alcohol off-flavor development,thereby contributed to maintaining the quality of the kiwifruit.
