The present invention relates to methods of isomerisation of X (xanthohumol) into IX (isoxanthohumol), by incubating a dry spent hop material containing polyphenols under inert conditions at a temperature of between 20 and 100 °C, until a product is obtained with a ratio of IX (w/w %) / X (xanthohumol) (w/w %) which is above 0,035.
Typically the dry spent hop material which is used in this method is the residual fraction obtained after the extraction in whole or in part of the soft resins and the hop oil from hops and wherein said dry spent hop material conditions is kept under inert conditions in the period after the extraction and before the isomerisation.
本发明涉及将 X(
黄腐醇)异构化为 IX(异黄腐 醇)的方法,具体方法是在 20 至 100 °C的惰性条件 下,将含有多
酚的干酒花废料进行培养,直到得到 IX(重量比)/X(
黄腐醇)(重量比)之比高于 0.035 的产品。
该方法中使用的干酒花废料通常是全部或部分从酒花中提取软
树脂和酒花油后的残留物,在提取后和异构化前的一段时间内,上述干酒花废料在惰性条件下保存。