目的:优化超声强化亚临界水提取脱脂葡萄籽中原花青素的最佳工艺参数,研究其抗氧化活性,并与传统方法进行比较。方法:采用自行设计的2 L超声强化亚临界水提取设备,研究影响超声强化亚临界水提取原花青素的几个因素,包括提取温度、提取...目的:优化超声强化亚临界水提取脱脂葡萄籽中原花青素的最佳工艺参数,研究其抗氧化活性,并与传统方法进行比较。方法:采用自行设计的2 L超声强化亚临界水提取设备,研究影响超声强化亚临界水提取原花青素的几个因素,包括提取温度、提取时间和提取压力,并通过响应曲面法优化出最佳工艺参数;通过其对DPPH自由基和亚硝酸钠清除作用研究了抗氧化活性。结果:超声强化亚临界水提取原花青素的最佳工艺参数为提取温度145℃,提取时间18 m in和提取压力14MPa,此时得率为4.05%;此条件下得到的原花青素对DPPH自由基和亚硝酸钠都有较好的清除作用;与传统索氏提取和热回流提取相比,超声强化亚临界水提取具有提取时间短、得率高等优点。结论:采用超声强化亚临界水提取技术提取脱脂葡萄籽中原花青素是可行的。展开更多
[Objective] This study was to explore the effects of dilute acid hydrolysis on fermentative biohydrogen production capacity of maize stalk. [Method] Using maize stalks subjected to mechanical disintegration,steam expl...[Objective] This study was to explore the effects of dilute acid hydrolysis on fermentative biohydrogen production capacity of maize stalk. [Method] Using maize stalks subjected to mechanical disintegration,steam explosion and dilute acid hydrolysis as experimental materials,we measured and analyzed the effects of different treatments and particle size of maize stalk were analyzed. [Result] The optimal fermentative biohydrogen production was found under following parameters:pretreatment of 0.8% dilute H2SO4 following steam explosion,particle size of maize stalk of 0.425-0.850 mm,liquid-solid ratio [0.8% H2SO4 (M):stalk (W)] of 10:1. [Conclusion] Post steam explosion,dilute 0.8% dilute H2SO4 intensified hydrolysis on maize stalk could produce fermentative biohydrogen production capacity.展开更多
文摘目的:优化超声强化亚临界水提取脱脂葡萄籽中原花青素的最佳工艺参数,研究其抗氧化活性,并与传统方法进行比较。方法:采用自行设计的2 L超声强化亚临界水提取设备,研究影响超声强化亚临界水提取原花青素的几个因素,包括提取温度、提取时间和提取压力,并通过响应曲面法优化出最佳工艺参数;通过其对DPPH自由基和亚硝酸钠清除作用研究了抗氧化活性。结果:超声强化亚临界水提取原花青素的最佳工艺参数为提取温度145℃,提取时间18 m in和提取压力14MPa,此时得率为4.05%;此条件下得到的原花青素对DPPH自由基和亚硝酸钠都有较好的清除作用;与传统索氏提取和热回流提取相比,超声强化亚临界水提取具有提取时间短、得率高等优点。结论:采用超声强化亚临界水提取技术提取脱脂葡萄籽中原花青素是可行的。
基金Supported by National Basic Research Program of China(2006CB708407 2009CB220005)+2 种基金National Natural Science Foun-dation of China (90610001 20871106)Program of 211 Projectfor Zhengzhou University from Ministry of Education~~
文摘[Objective] This study was to explore the effects of dilute acid hydrolysis on fermentative biohydrogen production capacity of maize stalk. [Method] Using maize stalks subjected to mechanical disintegration,steam explosion and dilute acid hydrolysis as experimental materials,we measured and analyzed the effects of different treatments and particle size of maize stalk were analyzed. [Result] The optimal fermentative biohydrogen production was found under following parameters:pretreatment of 0.8% dilute H2SO4 following steam explosion,particle size of maize stalk of 0.425-0.850 mm,liquid-solid ratio [0.8% H2SO4 (M):stalk (W)] of 10:1. [Conclusion] Post steam explosion,dilute 0.8% dilute H2SO4 intensified hydrolysis on maize stalk could produce fermentative biohydrogen production capacity.