Determination of folates in vegetables and their retention during boiling
Holasova, M.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Fiedlerova, V.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Vavreinova, S.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic)
HPLC method for 5-methyltetrahydrofolate (5-MTHF) determination in vegetables was optimised for the folate release from the food matrix. Enzymatic hydrolyses using the subsequent addition of alpha-amylase, protease, and conjugase from hog kidney, or their combinations, were tested. The highest release values were obtained with the application of alpha-amylase and conjugase, amounting to 112.4-127.0% of the values obtained in the processing with the conjugase alone. The simultaneous addition of both enzymes and the incubation at pH 4.9 did not suppress the release of folates. Spinach, Chinese cabbage, lettuce, cauliflower, and broccoli contained more than 50 microg of 5-MTHF/100g, whereas less than 25 microg/100 g was found in potatoes, carrot, white cabbage, green and yellow pepper. Individual vegetables differed in the folate retention during their boiling under constant conditions. The highest retention was found in Brussels sprouts, cauliflower, and broccoli. After 8 min boiling more than 75% of the initial amount of 5-MTHF remained in these vegetables. Lower values of 5-MTHF retention (between 37% and 52% of their initial content) were found in spinach, savoy cabbage, and carrot.
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