Department of Viticulture and Enology, University of California, Davis CA, 95616, United States; Food Safety and Measurement Facility, University of California, Davis CA, 95616, United States.
Department of Viticulture and Enology, University of California, Davis CA, 95616, United States.
J Chromatogr A. 2022 Jul 5;1674:463130. doi: 10.1016/j.chroma.2022.463130. Epub 2022 May 8.
Monoterpenes contribute to the characteristic aroma of several hop varieties and may occur as nonvolatile glycosides. Upon hydrolysis, the volatile terpenes are released from the glycoside precursors. Little is known, however, about the glycoside composition of hops. Seven pentose-hexose monoterpene alcohol glycosides from dried Humulus lupulus L. cv. Citra cones were isolated using high performance liquid chromatography separation and fractionation on a reverse phase phenyl-hexyl column. Further evaluation of each isolated fraction through HPLC qTOF MS with porous graphitic carbon (PGC) showed that the seven isolated monoterpenyl glycoside fractions could be further resolved into 20 isomers. Isolation on phenyl-hexyl followed by separation on PGC was needed to distinguish each isomer present. Additionally, the hop cones were screened for potential aroma glycosides. Using the PGC column combined with a database of over 900 potential glycosides, the identification of 21 additional monoterpene-polyol, norisoprenoid, volatile phenol, and aliphatic alcohol glycosides is reported.
单萜类化合物为几种啤酒花品种的特征香气做出贡献,并且可能以非挥发性糖苷的形式存在。在水解过程中,挥发性萜类化合物从糖苷前体中释放出来。然而,关于啤酒花的糖苷组成知之甚少。使用高效液相色谱分离和反相苯基-己基柱对干燥的蛇麻草 cv.西塔锥体中的七种戊糖-己糖单萜醇糖苷进行了分离。通过带有多孔石墨碳(PGC)的 HPLC qTOF MS 对每个分离的馏分进行进一步评估表明,这 7 种分离的单萜基糖苷馏分可以进一步分解为 20 种异构体。需要使用苯基-己基进行分离,然后使用 PGC 进行分离,以区分存在的每种异构体。此外,还对啤酒花锥体进行了潜在香气糖苷的筛选。使用 PGC 柱结合超过 900 种潜在糖苷的数据库,报告了 21 种额外的单萜-多元醇、异戊二烯、挥发性苯酚和脂肪醇糖苷的鉴定。
J Agric Food Chem. 2020-3-17
J Agric Food Chem. 2021-11-17