食品科学 ›› 2013, Vol. 34 ›› Issue (10): 16-20.doi: 10.7506/spkx1002-6630-201310004

• 工艺技术 • 上一篇    下一篇

响应面优化三氯乙酸沉淀测定豆酱游离氨基酸中蛋白质

张 苗,武俊瑞,代金月,邱小玉,岳喜庆   

  1. 沈阳农业大学食品学院,辽宁 沈阳 110866
  • 收稿日期:2012-10-11 修回日期:2013-03-31 出版日期:2013-05-25 发布日期:2013-05-07
  • 通讯作者: 岳喜庆 E-mail:yxqsyau@126.com
  • 基金资助:

    沈阳农业大学研究生创新培育项目

Optimized Conditions of Trichloroacetic Acid Precipitation for the Determination of Free Amino Acids in Fermented Soybean Paste

ZHANG Miao,WU Jun-rui,DAI Jin-yue,QIU Xiao-yu,YUE Xi-qing   

  1. College of Food Science, Shenyang Agricultural University, Shenyang 110866, China
  • Received:2012-10-11 Revised:2013-03-31 Online:2013-05-25 Published:2013-05-07

摘要:

采用三氯乙酸(TCA)沉淀法结合双缩脲比色法除去并测定蛋白质,探讨TCA质量浓度、沉淀温度、离心转数对蛋白质沉淀效果的影响,并采用Box-Behnken试验设计建立数学模型,进行响应面分析优化,确定最佳沉淀蛋白质条件。结果表明:TCA质量浓度8.3g/100mL、沉淀温度47℃、离心转数1726r/min时蛋白质沉淀效果量佳,蛋白质沉淀量为23.29g/100g,对游离氨基酸含量测定影响最小。

关键词: 豆酱, 氨基酸, 蛋白质, 沉淀, 响应面分析

Abstract:

In this study, trichloroacetic acid precipitation for protein removal coupled with biuret colorimetry was applied
to determine protein in fermented soybean paste. The influence of three factors such as precipitant dosage and concentration,
temperature and centrifuge speed was examined, and aa mathematical model was established by Box-Behnken design
for statistical optimization of the factors by response surface analysis. The results showed that the optimal conditions for
trichloroacetic acid precipitation were TCA concentration 8.3 g/100 mL, precipitation temperature 47 ℃, and centrifugal
speed 1726 r/min and had the smallest effect on the determination of free amino acids. The precipitate obtained under these
conditions contained 23.29 g/100 g prtoein.

Key words: fermented soybean paste, amino acid, protein, precipitation, response surface analysis

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