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本文研究了在α-型谷氨酸转晶生产上处理末次味精母液的工艺,pH4,6、谷氨酸含量为45%的α-型谷氨酸晶体、末次味精母液与水的混和悬液升温至70℃,并恒温搅拌38min可完成α-型谷氨酸转晶过程,经过滤及60℃左右的水洗涤可得到洁白的β-型谷氨酸晶体,其一次转晶收率达到83%,转晶母液再经一系列处理进行循环回收,达到有效去除因发酵过程中添加糖蜜带来的色素和母液因温度升高增加的色素,提高结晶收率的目的。 相似文献
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先将醪母液降低浓度,调整pH后加入a-型谷氨酸晶种育晶,然后调谷氨酸等电点进行结晶分离,分离的湿谷氨酸直接投入生产中.分离的上清液和滤液加盐酸水解后,再用醪母液调整水解液pH至谷氨酸等电点,结晶分离的湿谷氨酸由于NaCl含量较高,需水洗后才能投入生产.洗水和滤液则投入污水处理厂. 相似文献
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从味精醪母液中回收谷氨酸工艺研究(Ⅰ) 总被引:1,自引:0,他引:1
采用盐酸常温水解法,水解味精生产中产生的醪母液而制成水解液.首先将醪母液中的焦谷氨酸钠水解为谷氨酸,同时醪母液中的谷氨酸钠也还原为谷氨酸.再用醪母液调整水解液的pH值至谷氨酸的等电点pH3.0~3.2(试纸法),谷氨酸结晶析出,上清液和滤液排放(排杂),而滤渣(主要是谷氨酸)经过水洗,洗去水解时生成的NaCl和未被水解的焦谷氨酸,以及水溶性其他杂质,而颗粒状杂质或胶质物则在味精生产中,通过将回收的谷氨酸掺对投料,在中和罐中被粉沫活性炭吸附后被板框过滤机滤掉. 相似文献
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D-对羟基苯甘氨酸(D-HPG)是合成甜味剂、药物的重要中间体,为降低工艺成本,提高产品质量,提出了一种结晶母液回收D-HPG的连续色谱新工艺。优选纳滤膜进行前处理,增浓结晶母液,筛选Applexion NF200纳滤膜增浓D-HPG效果较好。通过单柱实验筛选连续色谱系统填料树脂,其中Applexion XA945树脂对D-HPG和硫酸铵分离度可达16。进一步对色谱系统的分离效果进行研究,结果表明,经连续色谱分离后,进料液中D-HPG平均纯度由42.2%提高至96.3%,平均收率达91%。利用连续色谱系统从结晶母液中回收D-HPG,是较有前途的工艺。与传统工艺相比,新工艺既保证了D-HPG总收率,又降低其工艺成本,提高了产品质量。 相似文献
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以科学方法研制出调酒母剂 ,替代原四川基酒参加固液勾兑生产新型白酒 ,酒质好 ,简化了勾兑工作 ,降低了生产成本 相似文献
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利用味精废水发酵生产苏云金芽孢杆菌的发酵条件研究 总被引:12,自引:0,他引:12
利用搅拌转速为 1 80r/min的 5L发酵罐 ,研究了 1株驯化后的苏云金芽孢杆菌(Bacillusthuringiensis)在味精废水中发酵生产生物农药的适宜工艺条件 ,并对发酵过程中的各个指标进行了检测。在 1 2m3规模的发酵罐中发酵菌数可达 68 7× 1 0 8/mL ,毒力效价与标准品相当。 相似文献
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A Review of the Alleged Health Hazards of Monosodium Glutamate 总被引:1,自引:0,他引:1
Anca Zanfirescu Anca Ungurianu Aristides M. Tsatsakis George M. Nițulescu Demetrios Kouretas Aris Veskoukis Dimitrios Tsoukalas Ayse B. Engin Michael Aschner Denisa Margină 《Comprehensive Reviews in Food Science and Food Safety》2019,18(4):1111-1134
Monosodium glutamate (MSG) is an umami substance widely used as flavor enhancer. Although it is generally recognized as being safe by food safety regulatory agencies, several studies have questioned its long‐term safety. The purpose of this review was to survey the available literature on preclinical studies and clinical trials regarding the alleged adverse effects of MSG. Here, we aim to provide a comprehensive overview of the reported possible risks that may potentially arise following chronic exposure. Preclinical studies have associated MSG administration with cardiotoxicity, hepatotoxicity, neurotoxicity, low‐grade inflammation, metabolic disarray, and premalignant alterations, along with behavioral changes. However, in reviewing the available literature, we detected several methodological flaws, which led us to conclude that these studies have limited relevance for extrapolation to dietary human intake of MSG risk exposure. Clinical trials have focused mainly on MSG effects on food intake and energy expenditure. Besides its well‐known impact on food palatability, MSG enhances salivary secretion and interferes with carbohydrate metabolism, while the impact on satiety and post‐meal recovery of hunger varied in relation to meal composition. Reports on MSG hypersensitivity or links of its use to increased pain sensitivity and atopic dermatitis were found to have little supporting evidence. Many of the reported negative health effects of MSG have little relevance for chronic human exposure and are poorly informative as they are based on excessive dosing that does not meet with levels normally consumed in food products. We conclude that further clinical and epidemiological studies are needed, with an appropriate design, accounting for both added and naturally occurring dietary MSG. 相似文献
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木糖生产过程中产生大量的木糖结晶母液。由于其杂糖含量较高,仅通过常规的浓缩,结晶等步骤,很难从中回收得到结晶木糖。本研究采用酵母发酵技术,先脱除木糖母液中的葡萄糖等杂糖,再结合真空浓缩与冷却结晶工艺,可以再析出晶体木糖,收率约25%。微生物脱除葡萄糖技术同样可用于玉米芯水解液中葡萄糖的有效去除,以提高木糖的结晶得率。 相似文献
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谷氨酸钠(MSG,谷氨酸一钠)、5'-肌苷酸二钠(IMP)和5'-鸟苷酸二钠(GMP),是主要增味成分。I+G是IMP和GMP按照1∶1混合的物质。研究谷氨酸钠及I+G的热处理稳定性,在食品烹调和食品加工过程中具有重要意义。实验主要采用高效液相色谱法测定杀菌温度、杀菌时间、pH对谷氨酸钠和I+G含量的影响。实验发现:杀菌时间为30 min时,经85℃,100℃,121℃杀菌,谷氨酸钠浓度分别损失3.16%,13.21%和30.10%;I+G浓度分别损失8.18%,12.91%和22.97%。在100℃下,经5,15,30 min杀菌,谷氨酸钠浓度分别损失1.43%,7.25%和8.63%;I+G浓度分别损失6.08%,8.78%和10.12%。在100℃下加热15 min,pH分别为7,6,5,4,3时,谷氨酸钠浓度分别损失2.2%,10.30%,22.4%,39.09%,52.50%;I+G浓度分别损失7.59%,9.30%,10.60%,12.89%,26.33%。 相似文献