Two Biotechnological Approaches to the Preparative Synthesis of Natural Dihydrocoumarin

化学 香豆素 产量(工程) 基质(水族馆) 克鲁维酵母 脱氢酶 生物催化 酵母 生物化学 催化作用 有机化学 生物 反应机理 材料科学 酿酒酵母 生态学 冶金
作者
Stefano Serra,Stefano Marzorati,Mario Valentino
出处
期刊:Catalysts [Multidisciplinary Digital Publishing Institute]
卷期号:12 (1): 28-28 被引量:2
标识
DOI:10.3390/catal12010028
摘要

In this work, we describe two different biotechnological processes that provide the natural flavour dihydrocoumarin in preparative scale. Both the presented approaches are based on the enzyme-mediated reduction of natural coumarin. The first one is a whole-cell process exploiting the reductive activity of the yeast Kluyveromyces marxianus, a Generally Recognized As Safe (GRAS) microorganism that possesses high resistance to the substrate toxicity. Differently, the second is based on the reduction of natural coumarin by nicotinamide adenine dinucleotide phosphate (NADPH) and using the Old Yellow Enzyme reductase OYE2 as catalyst. NADPH is used in catalytic amount since the co-factor regeneration is warranted employing an enzymatic system based on glucose oxidation, in turn catalysed by a further enzyme, namely glucose dehydrogenase (GDH). Both processes compare favourably over the previously reported industrial method as they work with higher coumarin concentration (up to 3 g/L for the enzymatic process) yet allowing the complete conversion of the substrate. Furthermore, the two approaches have significant differences. The microbial reduction is experimentally simple but the isolated dihydrocoumarin yield does not exceed 60%. On the contrary, the enzymatic approach requires the use of two specially prepared recombinant enzymes, however, it is more efficient, affording the product in 90% of isolated yield.
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