Martorano Toni-Ann, Ferguson Kyle L, Cameron Randall G, Zhao Wei, Hotchkiss Arland T, Chau Hoa K, Dorado Christina
U.S. Horticultural Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Fort Pierce, FL 34945, USA.
Eastern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Springfield, PA 19038, USA.
Foods. 2024 Nov 22;13(23):3738. doi: 10.3390/foods13233738.
Steam explosion (STEX) of peel from commercially juice-extracted oranges was used to convert peel pectin into pectic oligosaccharides (POSs). Surprisingly uniform populations, based on the polydispersity index (PDI; weight-average molecular weight (M)/number-average molecular weight (M)) of POSs, were obtained from the Hamlin and Valencia varieties of . The POSs from Hamlin and Valencia peel had PDI values of (1.23 ± 0.01, 1.24 ± 0.1), respectively. The M values for these samples were 14.9 ± 0.2 kDa for Hamlin, and 14.5 ± 0.1 kDa for Valencia, respectively. The degree of methyl-esterification (DM) was 69.64 ± 3.18 for Hamlin and 65.51 ± 1.61 for Valencia. The composition of the recovered POSs was dominated by galacturonic acid, ranging from 89.1% to 99.6% of the major pectic sugars. Only the Hamlin sample had a meaningful amount of rhamnose present, indicating the presence of an RG I domain. Even so, the Hamlin sample's degree of branching (DBr) was very low (2.95).
将商业榨汁后的橙子皮进行蒸汽爆破（STEX）处理，以将皮果胶转化为果胶寡糖（POSs）。基于POSs的多分散指数（PDI；重均分子量（M）/数均分子量（M）），从哈姆林和巴伦西亚品种的橙子中获得了惊人均匀的群体。哈姆林和巴伦西亚橙皮的POSs的PDI值分别为（1.23±0.01，1.24±0.1）。这些样品的M值，哈姆林为14.9±0.2 kDa，巴伦西亚为14.5±0.1 kDa。哈姆林的甲酯化程度（DM）为69.64±3.18，巴伦西亚为65.51±1.61。回收的POSs的组成以半乳糖醛酸为主，占主要果胶糖的89.1%至99.6%。只有哈姆林样品含有大量鼠李糖，表明存在RG I结构域。即便如此，哈姆林样品的分支度（DBr）非常低（2.95）。
