CHAO-TIAN LINYOU-CHENG SHEN2026-10-162026-10-162011-12-01Pure ID: 15007625Pure UUID: d0d65fbe-7052-4980-ae9d-42a225925d1810.1007/s12161-011-9204-6https://www.scopus.com/pages/publications/80955134389https://scholars.csmu.edu.tw/handle/123456789/31444An ion-exclusion liquid chromatography with mobile phase 0. 005 mol L -1 H 2SO 4 and step flow rate gradient (0. 2 mL min -1 in the first 40 min and 0.5 mL min -1 from 41 to 60 min) was used to determine 20 organic acids simultaneously at 17 °C within 51 min. The peak resolutions (Rs) were 0.45~3.02 and separation factors (α) were all higher than 1. Impurities in fruit vinegar executed with direct injection or C18 cartridge clean-up for analysis would influence the glutaric and oxalic acid measurement; however, SAX cartridge extraction could reduce the interferences (organic acid recoveries were 93.93~99.98%). Acetic, ascorbic, citric, malic, and malonic acids were the major organic acids in fruit vinegars (apple, apple sparkling, plum, cranberry, and grape).9enjournal article