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Gas chromatographic analysis of alkylresorcinols in rye ( Secale cereale L) grains
Author(s) -
Ross Alastair B,
KamalEldin Afaf,
Jung Charlotta,
Shepherd Martin J,
Åman Per
Publication year - 2001
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.956
Subject(s) - secale , extraction (chemistry) , acetone , chromatography , ethyl acetate , chemistry , gas chromatography , endosperm , gas chromatography–mass spectrometry , solvent , mass spectrometry , methanol , palm kernel , food science , biology , botany , organic chemistry , biochemistry , palm oil
A method was established for fast and easy analysis of 5‐ n ‐alkylresorcinols in rye grains, considering effects of milling (intact grains versus flour), extraction solvent (ethyl acetate, methanol and acetone), extraction volume per gram of sample (20 and 40 ml) and extraction time (3, 6, 18 and 24 h). For intact kernels, extraction of 1 g samples with ethyl acetate (40 ml, 24 h) is recommended. The ease of extraction is consistent with the presence of alkylresorcinols in the outer layers of the kernel and their absence in the endosperm. The extracts were analysed (without further purification or derivatisation) by gas chromatography using methyl behenate (C22:0, fatty acid methyl ester) as internal standard. Alkylresorcinols were identified by gas chromatography/mass spectrometry, and the major homologues were found to contain alkyl chains of C17:0, C19:0, C21:0, C23:0 and C25:0. The methodology was then applied to analyse the alkylresorcinol content in 15 rye cultivars grown at two locations in Sweden. Total alkylresorcinol contents varied within the range 549–1022 µg g −1 , and the average percentages of the different alkylresorcinols were: 17:0, 23%; 19:0, 32%; 21:0, 26%; 23:0, 11%; and 25:0, 8%. © 2001 Society of Chemical Industry