Affiliation:
1. Department of Drug Sciences University of Pavia viale Taramelli 12 Pavia Italy
2. Department of Chemistry in Pharmaceutical Sciences Complutense University of Madrid Plaza de Ramon y Cajal s/n Madrid Spain
3. Department of Biology and Biotechnology University of Pavia via Ferrata 1 Pavia Italy
4. Department of Chemistry University of Milan via Golgi 19 Milano Italy
Abstract
Abstractl‐Theanine (l‐Th) was synthesized by simply mixing the reactants (l‐glutamine and ethylamine in water) at 25 °C and Bacillus subtilis γ‐glutamyl transferase (BsGGT) covalently immobilized on glyoxyl‐agarose according to a methodology previously reported by our research group; neither buffers, nor other additives were needed. Ratio of l‐glutamine (donor) to ethylamine (acceptor), pH, enzymatic units (IU), and reaction time were optimized (molar ratio of donor/acceptor=1 : 8, pH 11.6, 1 IU mL−1, 6 h), furnishing l‐Th in 93 % isolated yield (485 mg, 32.3 g L−1) and high purity (99 %), after a simple filtration of the immobilized biocatalyst, distillation of the volatiles (unreacted ethylamine) and direct lyophilization. Immobilized BsGGT was re‐used (four reaction cycles) with 100 % activity retention. This enzymatic synthesis represents a straightforward, fast, high‐yielding, and easily scalable approach to l‐Th preparation, besides having a favorable green chemistry metrics.
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry
Cited by
1 articles.
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