研究新型抑芽剂3-癸烯-2-酮对马铃薯的抑芽保鲜效果,为马铃薯抑芽保鲜方面的应用提供了参考依据。以马铃薯品种青薯9号为试验材料,分别采用0.05、0.10、0.15、0.20、0.30 mL/kg的3-癸烯-2-酮对马铃薯进行抑芽熏蒸处理,考察马铃薯的抑芽...研究新型抑芽剂3-癸烯-2-酮对马铃薯的抑芽保鲜效果,为马铃薯抑芽保鲜方面的应用提供了参考依据。以马铃薯品种青薯9号为试验材料,分别采用0.05、0.10、0.15、0.20、0.30 mL/kg的3-癸烯-2-酮对马铃薯进行抑芽熏蒸处理,考察马铃薯的抑芽效果以确定适宜剂量,并研究适宜剂量下的3-癸烯-2-酮对马铃薯失重率、呼吸强度、抗氧化酶活性和膜脂过氧化等生理指标的影响。结果表明,3-癸烯-2-酮的适宜剂量为0.15 m L/kg,可显著降低贮藏期间的失重率、呼吸强度,延缓了膜脂过氧化程度,并提高了马铃薯的抗氧化酶SOD和CAT活性。展开更多
Hydroxy-16α,17α,21-trimethyl-5-en-20-one was synthesized from 3α-acetoxypregna-5,16-dien-20-one and characterized by elemental analysis, 1H NMR, MS and IR. 16α,17α-Dimethyl steroid was formed by treatment of 3β-...Hydroxy-16α,17α,21-trimethyl-5-en-20-one was synthesized from 3α-acetoxypregna-5,16-dien-20-one and characterized by elemental analysis, 1H NMR, MS and IR. 16α,17α-Dimethyl steroid was formed by treatment of 3β-acetoxypregna-5,16-dien-20-one with methylmagnesium bromide, followed by reaction of the resulting 17(20)-enolate with methyl iodide. The main by- products were 3β-hydroxy-16α,17α-dimethyl-5-en-20-one. LHDMS([(CH 3) 3Si] 2NLi) and LDA([(CH 3) 2CH] 2NLi) were chosen as proper reagents for 21-position alkylation. The almost quantitative conversion of 16α,17α-dimethyl corticosteroid was achieved and the highest yield of the 16α,17α,21-trimethyl corticosteroid was 78%. The optimum reaction temperature was -20 ℃ for 16α,17α- dialkylation and was -50 ℃ for 21- position alkylation.展开更多
文摘研究新型抑芽剂3-癸烯-2-酮对马铃薯的抑芽保鲜效果,为马铃薯抑芽保鲜方面的应用提供了参考依据。以马铃薯品种青薯9号为试验材料,分别采用0.05、0.10、0.15、0.20、0.30 mL/kg的3-癸烯-2-酮对马铃薯进行抑芽熏蒸处理,考察马铃薯的抑芽效果以确定适宜剂量,并研究适宜剂量下的3-癸烯-2-酮对马铃薯失重率、呼吸强度、抗氧化酶活性和膜脂过氧化等生理指标的影响。结果表明,3-癸烯-2-酮的适宜剂量为0.15 m L/kg,可显著降低贮藏期间的失重率、呼吸强度,延缓了膜脂过氧化程度,并提高了马铃薯的抗氧化酶SOD和CAT活性。
文摘Hydroxy-16α,17α,21-trimethyl-5-en-20-one was synthesized from 3α-acetoxypregna-5,16-dien-20-one and characterized by elemental analysis, 1H NMR, MS and IR. 16α,17α-Dimethyl steroid was formed by treatment of 3β-acetoxypregna-5,16-dien-20-one with methylmagnesium bromide, followed by reaction of the resulting 17(20)-enolate with methyl iodide. The main by- products were 3β-hydroxy-16α,17α-dimethyl-5-en-20-one. LHDMS([(CH 3) 3Si] 2NLi) and LDA([(CH 3) 2CH] 2NLi) were chosen as proper reagents for 21-position alkylation. The almost quantitative conversion of 16α,17α-dimethyl corticosteroid was achieved and the highest yield of the 16α,17α,21-trimethyl corticosteroid was 78%. The optimum reaction temperature was -20 ℃ for 16α,17α- dialkylation and was -50 ℃ for 21- position alkylation.
