[1]马正强,张贝贝,张京芳*,等. 热烫温度与pH值对香椿维生素C稳定性的影响[J].西北林学院学报,2015,30(03):201-205.[doi:doi:10.3969/j.issn.1001-7461.2015.03.35]
 MA Zheng-qiang,ZHANG Bei-bei,ZHANG Jing-fang*,et al. Effects of Blanching Temperature and pH on the Stability of Vitamin C of Toona sinensis[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2015,30(03):201-205.[doi:doi:10.3969/j.issn.1001-7461.2015.03.35]
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 热烫温度与pH值对香椿维生素C稳定性的影响()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第30卷
期数:
2015年03期
页码:
201-205
栏目:
出版日期:
2015-05-31

文章信息/Info

Title:
 Effects of Blanching Temperature and pH on the Stability of Vitamin C of Toona sinensis
文章编号:
1001-7461(2015)03-0201-05
作者:
 马正强张贝贝张京芳*苗修港余翔
 (西北农林科技大学 林学院,陕西 杨陵 712100)
Author(s):
 MA Zheng-qiang ZHANG Bei-bei ZHANG Jing-fang* MIAO Xiu-gang YU Xiang
 (College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China)
关键词:
 香椿维生素C热烫热稳定性pH值
Keywords:
Toona sinensis vitamin C blanching thermal stability pH value
分类号:
S792.99
DOI:
doi:10.3969/j.issn.1001-7461.2015.03.35
文献标志码:
A
摘要:
 为了研究香椿热烫过程中维生素C的变化规律,分析了不同热烫温度(90、95℃与100℃)和pH值(5.5、6.0与6.5)对香椿维生素C保存率的影响。结果表明,香椿维生素C的稳定性易受温度和pH值的影响,且热烫温度对其的影响程度大于pH值的影响程度。升高热烫温度或增大pH值,均使香椿维生素C保存率降低,其热降解遵循一级动力学模型,其降解的活化能分别为62.022、58.489、54.741 kJ·moL-1。相同pH值条件下,升高热烫温度,维生素C热降解速率常数增大,其半衰期缩短。增加pH值,维生素C热降解速率常数增大,其半衰期缩短。香椿加工中适当降低热烫温度及pH值有助于减少维生素C损失和延长维生素C保存时间,尤以降低烫漂温度效果更佳。
Abstract:
 To investigate thermal degradation kinetics of vitamin C in tender leaves of Toona sinensis during blanching, the effects of temperature on vitamin C degradation were measured at 90, 95 and 100℃with pH values of 5.5, 6.0 and 6.5, respectively. The results indicated that temperature and pH are important factors for the stability of vitamin C in the tender leaves of T. sinensis, and the influence of blanching temperatures was stronger pH. With the increase of blanching temperature and pH, the retention rate of vitamin C declined. Moreover, the degradation of vitamin C followed a first-order reaction with the activation energy (Ea) of 62.022, 58.489, and 54.741 kJ·moL-1. Increasing blanching temperature at the same pH value, or raising pH value at the same blanching temperature would increase the degradation rate constant and reduce half-life value of vitamin C. Moderately decreasing blanching temperature and pH value, especially reducing blanching temperature were favorable for protecting vitamin C.

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备注/Memo

备注/Memo:
 收稿日期:2014-10-19 修回日期:2014-12-04
基金项目:林业公益性行业科研专项(201304811)。
作者简介:马正强,男,在读硕士,研究方向:植物资源化学与加工利用。E-mail:s823108856@126.com
*通信作者:张京芳,女,教授,博士生导师,研究方向:林产食品资源利用。E-mail:z_jf008@163.com
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