Production, Stability, and Antioxidative and Antimicrobial Activities of Two <scp>l</scp>-Ascorbate Analogues from Phycomyces blakesleeanus: <scp>d</scp>-Erythroascorbate and <scp>d</scp>-Erythroascorbate Glucoside
作者:Marta Gutierrez-Larrainzar、Cristina de Castro、Pilar del Valle、Javier Rúa、María Rosario García-Armesto、Félix Busto、Dolores de Arriaga
DOI:10.1021/jf102202e
日期:2010.10.13
than d-EAA and l-AA at acidic pH. d-EAAG is synthesized from d-erythroascorbate by a mycelial glucosyltransferase activity that uses UDP-glucose as glucose substrate donor with Km = 2.5 mM and 41.3 μM for d-EAA. This glucosyltransferase activity was maximal in the stationary growth phase in parallel with maximal production of d-EAAG. The presence of d-arabinose or d-arabinono-1,4-lactone in the culture
d -Erythroascorbate(d -EAA)的五碳类似物升-ascorbate(升-AA),和d -erythroascorbate单糖苷(d -EAAG)被累积在须霉属blakesleeanus在葡萄糖上生长(99.5和1084微克/克菌丝体干重),并排泄到培养基中。两种化合物均显示出类似于1- AA的UV光谱性质和电离常数。d -EAAG是更稳定的有氧氧化比d -EAA和升-AA在酸性pH。d -EAAG由d合成通过使用UDP-葡萄糖作为葡萄糖底物供体的菌丝体葡糖基转移酶活性生成抗坏血酸酯,K m = 2.5 mM,d -EAA为41.3μM。该葡萄糖基转移酶活性在稳定的生长期中最大,与最大的d -EAAG产生平行。的存在d -arabinose或d -arabinono -1,4-内酯在培养基中产生的最大积累d -EAA和d -EAAG(相对于在葡萄糖培养物中获得约30-和