New bitter phenolic glycosides and a steroid glucoside have been isolated from the fresh bulbs of Lilium Henryi. On the basis of spectroscopic data, chemical evidence and X-ray crystallographic analysis, their structures have been elucidated as (2S)-1-O-p-methoxycinnamoyl-3-O-β-D-glucopyranosylglycerol (methylregaloside A), (2S)-1-O-caffeoyl-3-O-β-D-glucopyranosylglycerol (regaloside C), 3-O-feruloyl-6'-O-(4-O-β-D-glucopyranosylferuloyl)sucrose, and (25R)-3β, 26-dihydroxy-5α-cholestane-6, 22-dione 3-O-β-D-glucopyranoside. Several known components have also been isolated and identified.
We found that hydroxycinnamic acid (HA) glycerol esters such as 1-sinapoyl glycerol and 1-p-coumaroyl glycerol can be synthesized through a direct esterification reaction using a type A feruloyl esterase from Aspergillus niger. The water solubilities of HA glycerol esters were higher than those of the original chemicals. HA glycerol esters absorbed ultraviolet light and scavenged 1,1-diphenyl-2-picrylhydrazyl radicals.
我们发现羟基肉桂酸(HA)甘油酯,如 1-鞘氨醇甘油酯和 1-对香豆酰甘油酯,可通过使用黑曲霉的 A 型阿魏酰酯酶进行直接酯化反应合成。HA 甘油酯的水溶性高于原始化学品。HA 甘油酯可吸收紫外线并清除 1,1-二苯基-2-苦基肼自由基。