CHEN Jie,XU Jing-ting,GUO Shun-tang.Effect of Thermal Treatment of Defatted Soy Flakes on the Neutral Protease Activity in Koji and Contents of Amino Nitrogen in Fermented Soy Sauce[J].Soybean Science,2009,28(05):889-893.[doi:10.11861/j.issn.1000-9841.2009.05.0889]
豆粕热处理对酱曲中蛋白酶活性和酱油中氨基态氮含量的影响
- Title:
- Effect of Thermal Treatment of Defatted Soy Flakes on the Neutral Protease Activity in Koji and Contents of Amino Nitrogen in Fermented Soy Sauce
- 文章编号:
- 1000-9841(2009)05-0889-05
- Keywords:
- Thermal-treatment; Soy sauce; Neutral protease activity
- 分类号:
- TS214.2
- 文献标志码:
- A
- 摘要:
- 原料质量直接影响酱油的品质。以高温干热处理低温脱脂豆粕为原料,低盐固态法酿造酱油,分析热处理过程对曲料中性蛋白酶活力和酱油中氨基态氮含量的影响。低温脱脂豆粕经150 ℃热风循环处理30 min后酿造酱油,其中性蛋白酶活力和氨基态氮含量显著增加,分别为1478 U.g-1干基和1.235 g.100 mL-1,是对照的1.57倍和1.72倍。此外,20~40目的酱油粕粒度较适宜,能获得较高的蛋白酶活力,提高酱油中氨基态氮含量。说明适度的粒度和物料的均匀受热处理,可改善酿造酱油的质量。
- Abstract:
- Defatted soy flakes have critical influence on the quality of soy sauce.To study the effect of dry-heating substrates on the neutral protease activity in Koji and contents of amino nitrogen in the soy sauce,we investigated the thermal treatments of defatted soy flakes appropriate to solid-state and low-salt fermented soy sauce.The results demonstrated that thermal-treatment process was effective to increase the contents of neutral protease (1478 U.g-1 dry weight) in Koji and free amino acid (1.235 g.100 mL-1)in the soy sauce,using 150 degree centigrade thermo-wave treatment on the defatted soy flakes for 30 minutes.Furthermore,the grain size of defatted soy flakes from 20 to 40 mesh was more suitable than other sizes of substrates.All the results definitely prove that proper thermal treatment on the defatted soy flakes significantly improves the quality of soy sauce.
参考文献/References:
[1]陶文欣,许赣荣.固稀发酵及多菌种混合发酵法生产酱油技术的研究[D].无锡:江南大学,2001:8-20.(Tao W X.A study on soy sauce production technology characterized by solid state and semi-solid fermentation and muti-microorganism fermentation[D].Wuxi:Southern Yangtze University,2001:8-20.)
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备注/Memo
作者简介:陈杰(1985-),女,硕士,研究方向为酱油的原料和风味。E-mail:jennychen67@yahoo.com.cn。