Sorbus L. fruits are rich in phenolics, carotenoids, sugars and organic acids [1]. In this study the sugar and organic acid profiles were determined in the fruit samples of S. essezianii, ‘Alaja Krupnaja’, ‘Burka’, ‘Businka’, ‘Dodong’, ‘Fructo Lutea’, ‘Granatnaja’, ‘Kirsten Pink’, ‘Konzentra’, ‘Krasnaja Krupnoplodnaja’, ‘Likernaja’, ‘Miciurinskaja Desertnaja’, ‘Nevezinskaja’, ‘Pendula Variegata’, ‘Red Tip’, ‘Rosina Variegata’, ‘Rubinovaja’, ‘Sorbinka’, ‘Titan’, ‘White Swan’. HPLC-HILIC-ELSD method was applied for the analysis of xylose, fructose, glucose, sucrose, and sorbitol. HPLC-UV method was applied for the analysis of ascorbic and malic acid. Fructose, glucose and sorbitol were found in the profiles all Sorbus fruits. The greatest amount of sorbitol was determined in the fruit samples from ‘Pendula Variegata’ and ‘Koncentra’ (265.31±3.80 and 261.78±2.87 mg/g). The contents of malic acid ranged from 38.35 to 102.37 mg/g. The greatest amount of malic acid was determined in the fruit samples of ‘Rosina Variegata’ cultivar. Not all fruit samples of the tested Sorbus cultivars contained ascorbic acid. Ascorbic acid was absent in the fruit samples of ‘Burka’, ‘Businka’ and ‘Likernaja’ cultivars. The detected ascorbic acid content in rowanberry powders varied from 0.11 mg/g (‘Miciurinskaja Desertnaja) to 2.20 mg/g (‘Fructo Lutea’). In conclusion, the sugars and organic acids profiles are dependent on the cultivars.
References: 1. Mikulic-Petkovsek, et al., J. Food Sci. 2017, 82, 647–658.
Keywords: Sorbus L., HPLC-HILIC-ELSD, ascorbic acid, sugars.