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Secretagogue and bacteriostatic active fractions derived from a peptic hydro‐ lysate of alfalfa RuBisCO small purified subunit
Author(s) -
Trovaslet Marie,
Kapel Romain,
RavallecPlé Rozenn,
Mouni Fadoua,
Clarisse Martine,
Faille Christine,
Dhulster Pascal,
Guillochon Didier,
VercaigneMarko Dominique
Publication year - 2007
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.2754
Subject(s) - chromatography , chemistry , sodium dodecyl sulfate , sephadex , polyacrylamide gel electrophoresis , biochemistry , lysis , enzyme
For the first time a purification process for small RuBisCO (ribulose‐1,5‐bisphosphate carboxylase/oxygenase) subunit (SRS) was developed from an industrial by‐product of alfalfa, taking advantage of its solubility at low pH. Only one protein strip (14 kDa) was clearly detected in the sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS‐PAGE) profile of the supernatant at pH 2. The recovery of SRS was 48% by this method, with a purity estimated as 98% by densitometry and reverse phase high‐performance liquid chromatography (RP‐HPLC). Moreover, most polyphenolic compounds were discarded, as confirmed by spectrophotometry and RP‐HPLC. SRS hydrolysis was performed for 20 h at 37 °C using pepsin in ammonia/formic acid buffer at pH 3. The hydrolysate was fractionated on a Sephadex G25 column equilibrated with ethanolamine/HCl buffer. Biological activities were found in two fractions. The first fraction showed slight bacteriostatic properties against two pathogenic bacteria, Salmonella arizonae and Shigella sonnei . The second fraction, tested by radioimmunoassay (RIA), presented a secretagogue activity comparable to that of gastrin. Copyright © 2006 Society of Chemical Industry