The volatile oil from fresh shell of Alpinia katsumadai Hayata was obtained by steam distillation method,and its chemical constituents were analyzed by gas chromatography-mass spectrometry(GC-MS).Fifty-two compounds a...The volatile oil from fresh shell of Alpinia katsumadai Hayata was obtained by steam distillation method,and its chemical constituents were analyzed by gas chromatography-mass spectrometry(GC-MS).Fifty-two compounds accounting for 99.26% of total content of the volatile oil are identified.The main chemical constituents are terpenoids,including twenty-two monoterpenoids and twenty sesquiterpenoids,which are accounting for 84.07% and 8.63% of total content of the volatile oil,respectively.The relative contents of 1,8-cineole(19.18%),β-pinene(11.76%),terpinene-4-ol(10.42%),α-thujone(10.01%),p-cymene(9.28%) and α-pinene(6.22%) are higher in the volatile oil.It is concluded that there are various bioactive constituents in the volatile oil from fresh shell of A.katsumadai,and the value of exploitation and utilization of A.katsumadai shell is very high.展开更多
[Objective] The aim was to study the preservation of fresh Chinese wolfberry fruit via chitosan coating. [Method] Using Chinese wolfberry "Ningqi No. 1" as experimental material, the fresh fruits were coated...[Objective] The aim was to study the preservation of fresh Chinese wolfberry fruit via chitosan coating. [Method] Using Chinese wolfberry "Ningqi No. 1" as experimental material, the fresh fruits were coated by different concentrations of chitosan(0.75%, 1.00%, 1.25%, 1.50% and 1.75%) at room temperature to study the changes in weight loss rate, rate of rotten fruits rot, soluble solid content and vitamin C(Vc) content. [Result] Of all the treatments, the fruits coated with 1.25% chitosan showed lowest rate of rotten fruit and weight loss rate, and highest Vc and soluble solid content, presenting the optimal fresh-keeping effect. [Conclusion] Chitosan coating is helpful for the preservation of fresh Chinese wolfberry fruit at room temperature.展开更多
[Objective] The purpose of this study was to determine the effect of chitosan with different molecular weights on quality and lignification of postharvest Chi- nese chive scapes （Allium tuberosum Rottler ex Sprengel...[Objective] The purpose of this study was to determine the effect of chitosan with different molecular weights on quality and lignification of postharvest Chi- nese chive scapes （Allium tuberosum Rottler ex Sprengel）. [Method] Some physio- logical and biochemical indexes such as weight loss, decay index, opening rate of flowers, chlorophyll and ascorbic acid content, respiration rate, the activities of enzymes, lignin and cellulose content of Chinese chive scapes treated with three kinds of chitosan with different molecular weights were investigated during the room stor- age at 20 ℃ to simulate shelf life. [Result] The results showed that all the treat- ments of chitosan with different molecular weights significantly delayed weight loss, decay index and opening rate of flowers, maintained higher chlorophyll and ascorbic acid content, inhibited respiration rate, reduced the activities of enzymes phenylala- nine ammonia lyase, cinnamyl alcohol dehydrogenase and peroxidase, and retarded lignin and cellulose accumulation during the storage of Chinese chive scapes. However, high molecular weight chitosan has better preservation effect on Chinese chive scapes. [Conclusion] The results suggest that the coating treatment of high molecu- lar weight chitosan may be a promising technique to maintain postharvest quality of Chinese chive scapes.展开更多
文摘The volatile oil from fresh shell of Alpinia katsumadai Hayata was obtained by steam distillation method,and its chemical constituents were analyzed by gas chromatography-mass spectrometry(GC-MS).Fifty-two compounds accounting for 99.26% of total content of the volatile oil are identified.The main chemical constituents are terpenoids,including twenty-two monoterpenoids and twenty sesquiterpenoids,which are accounting for 84.07% and 8.63% of total content of the volatile oil,respectively.The relative contents of 1,8-cineole(19.18%),β-pinene(11.76%),terpinene-4-ol(10.42%),α-thujone(10.01%),p-cymene(9.28%) and α-pinene(6.22%) are higher in the volatile oil.It is concluded that there are various bioactive constituents in the volatile oil from fresh shell of A.katsumadai,and the value of exploitation and utilization of A.katsumadai shell is very high.
基金Supported by the Scientific and Technological Project of Yinchuan City, Ningxia Province~~
文摘[Objective] The aim was to study the preservation of fresh Chinese wolfberry fruit via chitosan coating. [Method] Using Chinese wolfberry "Ningqi No. 1" as experimental material, the fresh fruits were coated by different concentrations of chitosan(0.75%, 1.00%, 1.25%, 1.50% and 1.75%) at room temperature to study the changes in weight loss rate, rate of rotten fruits rot, soluble solid content and vitamin C(Vc) content. [Result] Of all the treatments, the fruits coated with 1.25% chitosan showed lowest rate of rotten fruit and weight loss rate, and highest Vc and soluble solid content, presenting the optimal fresh-keeping effect. [Conclusion] Chitosan coating is helpful for the preservation of fresh Chinese wolfberry fruit at room temperature.
基金Supported by Jiangsu Agriculture Science and Technology Innovation Fund[CX(11)4056]Strategic Key Project of Jiangsu Provincial Science and Technology Development(BE 2012417)~~
文摘[Objective] The purpose of this study was to determine the effect of chitosan with different molecular weights on quality and lignification of postharvest Chi- nese chive scapes （Allium tuberosum Rottler ex Sprengel）. [Method] Some physio- logical and biochemical indexes such as weight loss, decay index, opening rate of flowers, chlorophyll and ascorbic acid content, respiration rate, the activities of enzymes, lignin and cellulose content of Chinese chive scapes treated with three kinds of chitosan with different molecular weights were investigated during the room stor- age at 20 ℃ to simulate shelf life. [Result] The results showed that all the treat- ments of chitosan with different molecular weights significantly delayed weight loss, decay index and opening rate of flowers, maintained higher chlorophyll and ascorbic acid content, inhibited respiration rate, reduced the activities of enzymes phenylala- nine ammonia lyase, cinnamyl alcohol dehydrogenase and peroxidase, and retarded lignin and cellulose accumulation during the storage of Chinese chive scapes. However, high molecular weight chitosan has better preservation effect on Chinese chive scapes. [Conclusion] The results suggest that the coating treatment of high molecu- lar weight chitosan may be a promising technique to maintain postharvest quality of Chinese chive scapes.
