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首页> 外文期刊>Journal of the American Oil Chemists' Society >Lipase-catalyzed synthesis of saccharide-fatty acid esters using suspensions of saccharide crystals in solvent-free media.
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Lipase-catalyzed synthesis of saccharide-fatty acid esters using suspensions of saccharide crystals in solvent-free media.

机译：使用糖晶体在无溶剂介质中的悬浮液，进行脂肪酶催化的糖脂肪酸酯的合成。

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摘要

Saccharide-fatty acid esters, important biobased and biodegradable emulsifiers in foods, cosmetics, and pharmaceuticals, were produced with high yields and productivity via immobilized Rhizomucor miehei lipase-catalyzed esterification in solvent-free systems at 65 degrees C. Preliminary experiments demonstrated high rates of reaction occurred in the presence of acetone near or above its boiling point, due to the formation of 10-200 mum suspensions of saccharide particles. Subsequently, a two-step process was developed to produce a solvent-free supersaturated solution of 1.5-2.0 wt% saccharide that remained stable for >=10-12 h. The solvent-free suspensions were used in a bioreactor system at 65 degrees C, consisting of a reservoir open to the atmosphere that contained molecular sieves, a peristaltic pump, and a packed bed bioreactor, operated under continuous recirculation. At 10 h intervals, suspensions were re-formed by treating the substrate/product mixture with additional acyl acceptor and applying strong agitation. Using this system and approach, a product mixture containing 88% fructose oleate was formed, of which 92% was monoester, within 6 days. This equates to a productivity of 0.2 mmol h-1 g-1, which is similar to values reported for synthesis in the presence of solvent. (c)AOCS 2009.
机译：糖脂脂肪酸酯是食品，化妆品和药品中重要的生物基和可生物降解的乳化剂，通过固定化的Rhizomucor miehei脂肪酶催化的酯化反应在65°C的无溶剂体系中以高收率和高生产率生产。初步实验表明，在丙酮存在下接近或高于其沸点时，由于糖颗粒的10-200um悬浮液的形成，反应发生。随后，开发了两步法以生产1.5-2.0 wt％糖的无溶剂过饱和溶液，该溶液在> = 10-12 h的时间内保持稳定。无溶剂的悬浮液在65摄氏度的生物反应器系统中使用，该系统由向大气开放的储液罐组成，该储罐包含分子筛，蠕动泵和填充床生物反应器，在连续循环下运行。每隔10小时，通过用额外的酰基受体处理底物/产物混合物并强烈搅拌来重新形成悬浮液。使用该系统和方法，在6天内形成了包含88％果糖油酸酯的产物混合物，其中92％为单酯。这等于生产率为0.2 mmol h-1 g-1，这与报道的在溶剂存在下合成的值相似。 （c）2009年。

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