Rodríguez Galdón B, Rodríguez Rodríguez E M, Díaz Romero C
Dept. of Analytical Chemistry, Food Science and Nutrition, Univ. of La Laguna, Avda. Astrofísico Francisco Sánchez s/n, 38201, La Laguna, Santa Cruz de Tenerife, Spain..
J Food Sci. 2008 Oct;73(8):C599-605. doi: 10.1111/j.1750-3841.2008.00903.x.
Total phenol and flavonoid contents were analyzed by HPLC coupled with a diode array detector in 5 traditional onion cultivars from Tenerife (Guayonje, San Juan de la Rambla, Carrizal Alto, Carrizal Bajo, and Masca) and a commercial cultivar (Texas Early Grano 502). Five quercetin chemical species (isoquercetin, quercetin diglucoside, quercetin monoglucoside 1, quercetin monoglucoside 2, and free quercetin) and kaempferol were identified and quantified in the onion samples. Quercetin monoglucoside 1 and quercetin diglucoside were the major flavonoids accounting for 80% of the total quercetin content. The mean quercetin monoglucoside 1: quercetin diglucoside ratio (QMG/QDG) was 1: 2.2. There were differences between the onion cultivars in the cases of total phenol, quercetin diglucoside, isoquercetin, QMG/QDG ratio, and kaempferol. The Texas cultivar had a higher QMG/QDG ratio and a higher kaempferol content than the traditional cultivars. The correlation study showed significant correlations between the analyzed phenolic components.
采用高效液相色谱法结合二极管阵列检测器，对来自特内里费岛的5个传统洋葱品种（瓜永耶、圣胡安德拉兰布拉、卡里萨尔阿尔托、卡里萨尔巴霍和马斯卡）和1个商业品种（得克萨斯早粒502）中的总酚和黄酮含量进行了分析。在洋葱样品中鉴定并定量了5种槲皮素化学物质（异槲皮素、槲皮素二糖苷、槲皮素单糖苷1、槲皮素单糖苷2和游离槲皮素）以及山奈酚。槲皮素单糖苷1和槲皮素二糖苷是主要的黄酮类化合物，占总槲皮素含量的80%。槲皮素单糖苷1与槲皮素二糖苷的平均比例（QMG/QDG）为1:2.2。在总酚、槲皮素二糖苷、异槲皮素、QMG/QDG比例和山奈酚方面，洋葱品种之间存在差异。得克萨斯品种的QMG/QDG比例和山奈酚含量高于传统品种。相关性研究表明，所分析的酚类成分之间存在显著相关性。
