RRC ID 56520
Author Hwang SW, Choi HI, Sim SJ.
Title Acidic cultivation of Haematococcus pluvialis for improved astaxanthin production in the presence of a lethal fungus.
Journal Bioresour Technol
Abstract An acidic cultivation strategy was developed to prevent contamination of a lethal fungus Paraphysoderma sedebokerensis in Haematococcus pluvialis culture for astaxanthin production. Instead of generally used neutral pH, an acidic condition (pH 4) was applied to the cultivation, resulting in a significant inhibition of the fungal contamination. This could be ascribed to the acidity-associated denaturation of a surface protein of P. sedebokerensis, which plays an important role in recognition of H. pluvialis. Stress relief strategies including stepwise light irradiation and naturally occurring nitrogen deficiency were employed in the induction stage to minimize the reduction of astaxanthin production caused by acidic pH. Accordingly, an astaxanthin titer of 84.8 mg L-1 was obtained, which is 141-fold of that from the completely contaminated culture and double of that without the stress relief methods. This strategy provides a persistent contamination control method that can be used for practical astaxanthin production by H. pluvialis.
Volume 278
Pages 138-144
Published 2019-4-1
DOI 10.1016/j.biortech.2019.01.080
PII S0960-8524(19)30100-2
PMID 30685617
MeSH Acids Chlorophyceae / metabolism* Fungi, Unclassified / metabolism* Hydrogen-Ion Concentration Nitrogen / metabolism Xanthophylls / biosynthesis
IF 6.669
Times Cited 8
Algae NIES-144