Comparison of different extraction methods for simultaneous determination of B complex vitamins in nutritional yeast using LC/MS-TOF and stable isotope dilution assayHälvin, Kristel; Paalme, Toomas; Nisamedtinov, IldarAnalytical and bioanalytical chemistry2013 / p. 1213-1222 : ill Comparison of different extraction methods to determine free and bound forms of B-group vitamins in quinoaHälvin, Kristel; Nisamedtinov, Ildar; Paalme, ToomasAnalytical and bioanalytical chemistry2014 / p. 7355-7366 : ill