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将超滤膜运用到味精末次母液进行脱色除杂,试验结果为:味精末次母液的三价铁离子的截留率为48.2%,对焦谷氨酸钠截留率为47.8%,但对影响质量的最大因素料液的透光率来说则可以上升近50%,比传统的板框加碳柱则透光高近10%;脱色最佳浓缩比为8~9;膜法的产品收率为98.52%. 相似文献
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利用活性炭对紫贻贝蛋白的酶解液进行脱色,以活性炭添加量、溶液pH、脱色时间和脱色温度为试验因素,感官评定、脱色率和氨基酸损失率为综合考察指标,采用单因素试验和正交试验对紫贻贝蛋白酶解液的脱色工艺条件进行研究。结果表明,活性炭的最佳脱色条件为活性炭添加量0.6%,pH 3,脱色时间20min,脱色温度20℃。该条件下,酶解液的脱色率、氨基酸损失率、感官评分分别为81.6%、19.4%、8.8。因此,活性炭可用于紫贻贝酶解液的脱色,脱色后的酶解液可用于制备热反应海鲜味香精。 相似文献
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为优化烟草秸秆低聚木糖制备参数,采用碱解方法提取木聚糖、酶解法制备低聚木糖以及单因素实验法考察了常见因素对工艺的影响。结果表明,木聚糖提取条件为:2.000 g秸秆粉末(≤100目)浸没于20.00 mL浓度为24% NaOH(m/V)和1% NaBH4(m/V)碱液中,70 ℃条件下浸提4 h,滤液加3倍乙醇体积用量进行醇沉以及0.2倍乙酸体积用量进行中和。制备低聚木糖的条件为:溶液pH为5.50,温度40 ℃,时间6 h,木聚糖溶液(20 mg/mL)10 mL,木聚糖酶液(0.6%,m/V,4.1 U/mL)20 mL。低聚木糖分离提纯条件为:阳离子树脂柱分离纯化,填充高度18.0 cm、直径为4.5 cm;纯化液用高效液相色谱进行定性定量分析。通过上述方法得到的低聚木糖产品纯度较高,对工业制备低聚木糖工艺优化有一定的参考价值。 相似文献
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应用胶体金免疫层析技术,建立了一种快速检测谷物和饲料中T-2毒素的方法.采用柠檬酸三钠还原法制备胶体金颗粒,标记抗T-2毒素单克隆抗体并喷涂于玻璃纤维上,T-2毒素偶联抗原和羊抗鼠二抗分别喷涂于硝酸纤维素膜上,作为检测线和质控线,依次将样品垫、胶体金垫、硝酸纤维素膜和吸水垫组装成试纸条并装入检测卡中.测试结果表明,T-2毒素快速检测试纸条的检测限为0.Smg/L,检测时间为10min,假阳性率和假阴性率均为0.该法使用简单方便,非常适合现场快速检测谷物和饲料中的T-2毒素. 相似文献
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以不同浓度的低聚木糖溶液作为抑菌剂,考察了其对金黄色葡萄球菌、大肠杆菌、枯草芽孢杆菌和青霉菌的体外抑制作用。采用固体培养牛津杯法和液体培养法进行抑菌试验,分别以抑菌圈大小、菌落数、液体培养基菌体数为指标,确定了低聚木糖的抑菌效果。牛津杯抑菌试验中,出现了直径很小的抑菌圈;布平板菌落计数试验中,同阴性对照菌落数略少;液体培养法中菌体数数量没有明显减少;综上所述低聚木糖不能作为抑菌剂。 相似文献
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利用稀碱蒸煮对麦草进行预提取,对提取液进行纯化、酶解,并外对预提取后的固体物料进行烧碱法蒸煮.分析了提取液、低聚木糖溶液的成分和预提取后固体物料及所制得纸浆的组分含量,考察了纸浆的特性及黑液物化性能,探讨了预提取的作用效果.结果表明,预提取最佳用碱量为4%~6%,低聚木糖得率可达7.22%,聚合度为2.32;后续低碱蒸煮获得纸浆的卡伯值、黏度均与对照纸浆相近,白度、裂断长、撕裂指数和耐折度等均高于对照浆;黑液黏度低于对照黑液,高位发热量高于对照黑液,可达到15MJ/kg 以上. 相似文献
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以醋蛋、蜂蜜为主要原料,研制了醋蛋口服液的加工工艺。由单因素试验确定了低聚木糖、蜂蜜、醋蛋液和浓缩苹果汁的添加量对产品风味的影响。通过正交试验优化了产品的配方。正交试验结果表明,4个因素中,醋蛋液和蜂蜜对产品风味有显著影响,低聚木糖和浓缩苹果汁对产品风味影响不显著。醋蛋口服液的最佳配方为:低聚木糖0.8g/100mL、蜂蜜10%、醋蛋液19%、浓缩苹果汁3.5%。复合稳定剂的最佳配比为:CMC-Na 0.75%、果胶0.3%、海藻酸钠0.15%。 相似文献
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The process of ultrafiltration of a model solution and 12% soluble solids apple juice containing pectins through tubular membranes of 100 and 300 kDa (1 and 3 channels) was studied. Furthermore, in order to obtain a higher permeate flow, the fluids were previously treated with pectinolytic enzymes recirculating through a tubular membrane at different concentrations and treatment times. The permeate flow was analyzed with respect to time and the influence of enzymatic treatment on different parameters: viscosity, density, absorbance at 420 nm, reducing sugars, °Brix, color and pH. Depectinization increased the permeate flow for the model solution and apple juice with 67.52% and 53.11% when the pectinolytic enzyme preparation re-circulated across the tubular membrane. Using the lowest concentration of enzyme treatment and the longest recirculation treatment, an increase in permeate flow was obtained leading to a more favourable clarification process and economic benefits. 相似文献
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A sensitive enzyme-linked immunosorbent assay for detection of T-2 toxin with monoclonal antibodies 总被引:1,自引:0,他引:1
J Chiba O Kawamura H Kajii K Ohtani S Nagayama Y Ueno 《Food Additives & Contaminants》1988,5(4):629-639
Six monoclonal antibodies (mAbs, T-2.1, 2, 3, 4, 5, 6) which react with a trichothecene mycotoxin, T-2 toxin (T-2), were prepared. All antibodies specifically reacted with T-2 but less (0.5% of T-2) with the metabolites such as HT-2 toxin and 3'-hydroxy-T-2 toxin. Significant but less than 0.02% cross-reactivity was observed with T-2 triol, 3'-hydroxy-HT-2 toxin and neosolaniol. No significant reaction with other trichothecenes such as deoxynivalenol, nivalenol, fusarenon-X, crotocin, or roridin A was observed. The least detectable amount of T-2 with the best mAb T-2.1 was 2.5 pg T-2 per assay. This specific and highly sensitive assay for T-2 was applied for the quantitation of T-2 in wheat flour spiked with mycotoxin, with combination of a simple extraction procedure. 相似文献