Secretagogue and bacteriostatic active fractions derived from a peptic hydro- lysate of alfalfa RuBisCO small purified subunit
✍ Scribed by Marie Trovaslet; Romain Kapel; Rozenn Ravallec-Plé; Fadoua Mouni; Martine Clarisse; Christine Faille; Pascal Dhulster; Didier Guillochon; Dominique Vercaigne-Marko
- Book ID
- 102433372
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 359 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0022-5142
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
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