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Determination of S‐ Adenosyl‐ l ‐methionine in Fruits by Capillary Electrophoresis
Author(s) -
Van de Poel Bram,
Bulens Inge,
Lagrain Pieter,
Pollet Jeroen,
Hertog Maarten L. A. T. M.,
Lammertyn Jeroen,
De Proft Maurice P.,
Nicolaï Bart M.,
Geeraerd Annemie H.
Publication year - 2010
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.1241
Subject(s) - chemistry , capillary electrophoresis , chromatography , trichloroacetic acid , glycine , extraction (chemistry) , methionine , detection limit , phosphate buffered saline , high performance liquid chromatography , amino acid , biochemistry
– S‐ adenosyl‐ l ‐methionine (SAM) plays an important role in many biochemical reactions in plants. It is mainly used as a methyl donor for methylation reactions, but it also participates in, for example, the biosynthesis of polyamines and the plant hormone ethylene. Objective – To develop a fast capillary electrophoresis technique to separate SAM in fruits and fruit juices without any pre‐purification steps. Methodology – Four different extraction solutions and two extraction times were tested, of which 5% trichloroacetic acid (TCA) for 10 min was found most suited. A glycine : phosphate buffer (200 : 50 m m , pH 2.5) was found optimal to analyse SAM in TCA extracts. Analyses were preformed on different climacteric and non‐climacteric fruits and fruit juices. The calibration curve was created in degraded tomato extract. The CE‐method was compared with a more conventional HPLC method described in literature. Results – The CE technique made it possible to completely separate the S , S‐ and R , S‐ diastereoisomeric forms of SAM. The CE method proved to be very fast (20 min total running time instead of 42 min) and more sensitive (limit of detection of 0.5 µ m instead of 1 µ m ) compared with the conventional HPLC method. Conclusion – Fast measurements of SAM in fruits and juices are favoured by capillary electrophoresis in a 200 : 50 m m glycine : phosphate (pH 2.5) buffer system.