Screening of Poly-ε-lysine-producing Strain and its Fermentation Technology

Abstract:

A strain with 2 g/L yield of poly-ε-lysine was firstly screened from soil on an agar plate containing methylene blue and then further selected by a flask experiment. The strain was preliminarily identified as Streptomyces albulus. The experiment about medium optimization showed that glucose was the best carbon sources and yeast extract and (NH₄)₂SO₄ were the best compound nitrogen sources. The yield of ε-PL reached 3.9 g/L with optimal medium.