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排序方式: 共有110条查询结果,搜索用时 852 毫秒
1.
Huiping Hu Jianxiong Hao Yongqiang Cheng Lijun Yin Yanli Ma Zhenwei Yu Lite Li 《International Journal of Food Science & Technology》2012,47(4):689-695
A low‐salt (4% NaCl, w/w) douchi supplemented with different concentration of fermented rice culture (FRC) of 0%, 5%, 10%, 15% and 20% (v/w) was produced, and the effect of FRC on microbiology, biochemistry and sensory quantity was investigated. Results indicated that FRC had a significant effect on low‐salt douchi. Compared with the control (added 0% FRC), in the other treatments, the counts of yeast and lactic acid bacteria increased by about 50%, whereas the moulds decreased by about 30%; the pH reduction was close to 4.7; total acid increased to about 1.300 g per 100 g; reducing sugar maintained a decrease to 21.07 mg per g; amino nitrogen increased to about 0.900 g per 100 g, but not above the control (1.013 g per 100 g). In general terms, total free amino acid contents and three organic acids were higher in low‐salt products than four commercial products. Sensory evaluation of products supplemented with 10% and 15% FRC revealed better overall acceptability compared with other treatments and a commercial product. 相似文献
2.
大孔树脂D380固定化橄榄绿链霉菌E-86来源木聚糖酶的研究 总被引:5,自引:0,他引:5
选择有代表性的 1 4种吸附和离子交换树脂进行了橄榄绿链霉菌E 86来源的木聚糖酶固定化试验 ,筛选出固定化效果较好的 72 4和D3 80两种树脂 ;对含伯氨基的离子交换树脂D3 80采用戊二醛进行交联固定化 ,研究了其固定化条件。结果表明 ,戊二醛浓度为1 % ,处理 3 0min ,加酶量为 0 8~ 1mL ,酶液pH 5 8,2 5℃ ,5~ 1 0h固定化处理效果最好 ,获得的固定化酶活力可达 64U/ g(载体 )。 相似文献
3.
Electrolyzed functional water possesses a wide variety of antimicrobial activities. Electrolyzed functional water, which used to take place of tap water in producing mung bean sprouts, was studied in this paper. The results showed that electrolyzed water can not only reduce the quantity of microorganism on the surface of mung bean sprouts, but also promote the growth of sprouts. Further research showed that electrolyte leakage rate of mung bean soaked in electrolyzed water was the lowest, while the catalase’s activity of mung bean soaked in electrolyzed water was the highest. All of these contribute to the high activity of mung bean. 相似文献
4.
荞麦粉方便面加工的新工艺,即使用一种天然复合粘结剂,不仅解决了加工中的易断条问题,使产品中荞麦粉含量超过60%,而且使产品复水后不糊汤、不糟条、有嚼劲、口感佳。 相似文献
5.
Characterization of a thermostable family 10 endo-xylanase (XynB) from Thermotoga maritima that cleaves p-nitrophenyl-beta-D-xyloside 总被引:2,自引:0,他引:2
Zhengqiang J Kobayashi A Ahsan MM Lite L Kitaoka M Hayashi K 《Journal of Bioscience and Bioengineering》2001,92(5):423-428
Thermotoga maritima MSB8 possesses two xylanase genes, xynA and xynB. The xynB gene was isolated from the genomic DNA of T. maritima, cloned, and expressed in Escherichia coli. XynB was purified to homogeneity by heat treatment, affinity chromatography and ion-exchange column chromatography. The purified enzyme produced a single band upon SDS-PAGE corresponding to a molecular mass of 42 kDa. At 70 degrees C, the enzyme was stable between pH 5.0 and pH 11.4, and it was stable at temperatures of up to 100 degrees C from pH 7.0 to pH 8.5. At 50 degrees C, XynB displayed an optimum pH of 6.14 and at this pH the temperature for optimal enzyme activity was 90 degrees C. XynB exhibited broad substrate specificity and was highly active towards p-nitrophenyl-beta-D-xylobioside with K(m) and k(cat) values of 0.0077 mM and 5.5 s(-1), respectively, at 30 degrees C. It was also active towards p-nitrophenyl-beta-D-xyloside. The initial product of the cleavage of p-nitrophenyl-beta-D-xyloside was xylobiose, indicating that the major reaction in the cleavage was transglycosylation, not hydrolysis. 相似文献
6.
Xin Lu Zhanhui Lu Lijun Yin Yongqiang Cheng Lite Li 《Food research international (Ottawa, Ont.)》2010,43(6):1673-1683
To elucidate the effect of preheating temperature and calcium ions on the properties of cold-set soybean protein gel, Ca2+ induced gelation of soybean protein were investigated by rheological approaches, electrophoresis analysis, confocal scanning laser microscopy (CSLM) and surface hydrophobicity (S0). The results showed that, both CaCl2 concentration (20–40 mM) and preheating temperature (80–120 °C) took significant influence on the dynamic viscoelasticity of the gel samples. The bands distribution of samples preheated at 120 °C were different from the bands distribution of samples preheated below 100 °C in denature and native electrophoresis. The CSLM analysis showed that the gel became coarser as the Ca2+ increased. On the other hand, two different kinds of gel were shown under the same Ca2+ concentration: a bead-like structure (below 100 °C) and a filamentous structure (above 100 °C). According to fractal theory, weak-linked gel (α was >0.8) was formed when preheating below 100 °C, while a transition gel (α = 0.52–0.62) was obtained when preheating over 100 °C. All these results suggested that the preheating temperature influence the type of cold-set gel. 相似文献
7.
8.
食品蛋白电渗透脱水条件与模型解析 总被引:2,自引:0,他引:2
电渗透脱水的条件影响及其数学模型解析是将这一研究转化为应用技术的重要条件,本文通过对豆腐渣、大豆分离蛋白和玉米蛋白电渗透脱水试验分析,探讨了食品蛋白电渗透脱水的各种条件影响和加快脱水速率的方法。同时对照建立的可压缩理想浆料电渗透脱水理论模型进行了推导和分析。 相似文献
9.
10.
论传统小麦面食的现代化与工业化 总被引:3,自引:1,他引:2
概述了传统小麦面食的发展现状及存在的问题,就促进小麦面食工业化发展及新产品开发等问题提出了几点建议,并对传统小麦面食的工业化发展进行了展望。 相似文献