INTRODUCTION: 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 mm, 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 µm instead of 1 µm) compared with the conventional HPLC method. CONCLUSION: Fast measurements of SAM in fruits and juices are favoured by capillary electrophoresis in a 200 : 50 mm glycine : phosphate (pH 2.5) buffer system.
INTRODUCTION: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 mm, 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 µm instead of 1 µm) compared with the conventional HPLC method. CONCLUSION: Fast measurements of SAM in fruits and juices are favoured by capillary electrophoresis in a 200 : 50 mm glycine : phosphate (pH 2.5) buffer system.
Authors: Bram Van de Poel; Inge Bulens; Aikaterina Markoula; Maarten L A T M Hertog; Rozemarijn Dreesen; Markus Wirtz; Sandy Vandoninck; Yasmin Oppermann; Johan Keulemans; Ruediger Hell; Etienne Waelkens; Maurice P De Proft; Margret Sauter; Bart M Nicolai; Annemie H Geeraerd Journal: Plant Physiol Date: 2012-09-13 Impact factor: 8.340
Authors: Inge Bulens; Bram Van de Poel; Maarten Latm Hertog; Maurice P De Proft; Annemie H Geeraerd; Bart M Nicolaï Journal: Plant Methods Date: 2011-06-23 Impact factor: 4.993
Authors: Aymerick Eudes; Nanxia Zhao; Noppadon Sathitsuksanoh; Edward E K Baidoo; Jeemeng Lao; George Wang; Sasha Yogiswara; Taek Soon Lee; Seema Singh; Jenny C Mortimer; Jay D Keasling; Blake A Simmons; Dominique Loqué Journal: Front Bioeng Biotechnol Date: 2016-07-19