基于核磁共振(nuclear magnetic resonance,NMR)技术具有无损检测结构信息的特点,利用宽带探头(broadband observe,BBO)和标准压制水峰脉冲序列zgcpfqpr(zero go composite pulse frequency presaturation),获得两种葡萄酒非目标物质信...基于核磁共振(nuclear magnetic resonance,NMR)技术具有无损检测结构信息的特点,利用宽带探头(broadband observe,BBO)和标准压制水峰脉冲序列zgcpfqpr(zero go composite pulse frequency presaturation),获得两种葡萄酒非目标物质信息,并用标准加入法检定葡萄酒中的甲醇含量,研究结果表明核磁共振可以判断两种葡萄酒中甲醇、糖度、乙酸、乳酸、柠檬酸、琥珀酸、葡萄汁液中脯氨酸等信息。展开更多
Following the isolation and identification of Lonicera Caerulea,the stability of Cyanindin-3-glucoside（anthocyanins）was studied in detail.The results show the pigment would be better dissolved in water and ethanol a...Following the isolation and identification of Lonicera Caerulea,the stability of Cyanindin-3-glucoside（anthocyanins）was studied in detail.The results show the pigment would be better dissolved in water and ethanol and tastes good.The pigment becomes red in acidic solution,violet red in weak acidic or neutral solution,and blue in basic solution.The pigment is resistant to heat.The color of pigment becomes strong with adding of vitamin C,cane sugar and starch.The pigment would be degradated by light and hydrogen peroxide.Metal ion(except Fe3+)had no bad effect on the color of the pigment.展开更多
文摘基于核磁共振(nuclear magnetic resonance,NMR)技术具有无损检测结构信息的特点,利用宽带探头(broadband observe,BBO)和标准压制水峰脉冲序列zgcpfqpr(zero go composite pulse frequency presaturation),获得两种葡萄酒非目标物质信息,并用标准加入法检定葡萄酒中的甲醇含量,研究结果表明核磁共振可以判断两种葡萄酒中甲醇、糖度、乙酸、乳酸、柠檬酸、琥珀酸、葡萄汁液中脯氨酸等信息。
文摘Following the isolation and identification of Lonicera Caerulea,the stability of Cyanindin-3-glucoside（anthocyanins）was studied in detail.The results show the pigment would be better dissolved in water and ethanol and tastes good.The pigment becomes red in acidic solution,violet red in weak acidic or neutral solution,and blue in basic solution.The pigment is resistant to heat.The color of pigment becomes strong with adding of vitamin C,cane sugar and starch.The pigment would be degradated by light and hydrogen peroxide.Metal ion(except Fe3+)had no bad effect on the color of the pigment.
