摘要
本文以高盐稀态酱油为研究对象,分析了不同盐水浓度及pH值对其酿造前30 d酱醪理化特性的影响。结果表明:在自然pH(7.2),盐水浓度为16%、20%、24%条件下,随着盐水浓度的增加,酱醪中总氮、氨基酸态氮、总酸的增加速率以及pH值下降速率均减小且还原糖含量增加。酿造30 d时,16%和20%盐水浓度的酱醪总氮相比24%盐水浓度提高5%和7%,氨基酸态氮提高12%和11%,而20%和24%盐水浓度的酱醪中还原糖(以葡萄糖计)含量相比盐水浓度16%的高出53%和20%。在盐水浓度为16%,将pH值调8.5和9.5,随着盐水pH值的增加,全氮含量变化不明显,pH值下降速率变缓,30 d时初始盐水pH9.5的酱醪pH为5.04;酿造30 d时pH9.5和pH8.5相比自然pH氨基酸态氮提高12%和4%;在发酵前15 d盐水pH对还原糖含量无显著性差异,而在发酵30 d后高pH值的盐水导致还原糖含量降低。可见,在一定程度上降低盐水浓度、增加盐水pH值有利于酱油原料利用率和氨基酸转化率的提高,主要原因是不同的盐浓度及pH值影响了酱醪中蛋白酶活力大小和利用以及渗透压影响了酱醪与酱液之间营养物质的交换。
The objective of this paper was to investigate the effect of salt concentration（SC） and pH of brine on physicochemical properties of moromi during the early 30-day fermentation for high-salt diluted soy sauce.The results showed that the increase rates of total nitrogen（TN）,amino acid nitrogen（AN） and total acid and the decline rate of pH were decreased,while the reducing sugar content（as glucose） increased with the increase of SC at the natural pH.TN and AN in moromi with SC of 16% and 20% were increased by 5% and 7%,12% and 11% compared to those with 24% of SC,while the reducing sugar content in moromi with SC of 20% and 24% increased by 20% and 53% compared to that with SC of 16%.At the conditions of SC at 16%,TN in moromi didn＇t change significantly and the decline rate of pH became slow when the pH of SC was adjusted from 7.2 to 8.5 and 9.5.After 30 days of fermentation,pH of moromi with original pH 9.5 became 5.04.At the 30 days of fermentation,the AN in moromi at pH8.5 and 9.5 increased by 12% and 4% compared to that in the natural pH.In the first 15 days of fermentation,there was no significant change in reducing sugar content,whereas the higher pH caused a decrease in the reducing sugar content at 30 days of fermentation.Therefore,reducing the SC and increasing pH might improve utilization of raw materials and amino acid conversion rate by adjusting the effects of protease activity and osmotic pressure.
出处
《现代食品科技》
EI
CAS
2011年第4期380-383,共4页
Modern Food Science and Technology
基金
国家十一五科技支撑计划项目(2008BAI63B06)
广东省科技计划工业攻关项目(2007A010900001
2008A010900001
2009A010700004
2010A010500002)
关键词
酱油
盐水浓度
PH值
理化性质
soy sauce
brine concentration
pH value
physicochemical properties
