title: Citric acid production from extract of Jerusalem artichoke tubers by the genetically engineered yeast Yarrowia lipolytica strain 30 and purification of citric acid.
abstract: In this study, citric acid production from extract of Jerusalem artichoke tubers by the genetically engineered yeast Yarrowia lipolytica strain 30 was investigated. After the compositions of the extract of Jerusalem artichoke tubers for citric acid production were optimized, the results showed that natural components of extract of Jerusalem artichoke tubers without addition of any other components were suitable for citric acid production by the yeast strain. During 10 L fermentation using the extract containing 84.3 g L(-1) total sugars, 68.3 g L(-1) citric acid was produced and the yield of citric acid was 0.91 g g(-1) within 336 h. At the end of the fermentation, 9.2 g L(-1) of residual total sugar and 2.1 g L(-1) of reducing sugar were left in the fermented medium. At the same time, citric acid in the supernatant of the culture was purified. It was found that 67.2 % of the citric acid in the supernatant of the culture was recovered and purity of citric acid in the crystal was 96 %.
authors.affiliation: Unesco Chinese Center of Marine Biotechnology, Ocean University of China, Yushan Road, No. 5, Qingdao, Shandong, 266003, China.
authors.forename: Ling-Fei
authors.initials: LF
authors.lastname: Wang
authors.forename: Zhi-Peng
authors.initials: ZP
authors.lastname: Wang
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Liu
authors.forename: Zhen-Ming
authors.initials: ZM
authors.lastname: Chi
mesh_terms: D000645:Ammonium Sulfate / Q000032:analysis; D019343:Citric Acid / Q000378:metabolism*; D005285:Fermentation; D005818:Genetic Engineering; D006368:Helianthus / Q000378:metabolism*; D008274:Magnesium / Q000737:chemistry; D010936:Plant Extracts / Q000378:metabolism*; D013831:Thiamine / Q000737:chemistry; D025062:Yarrowia / Q000378:metabolism*
chemical_list: D010936:Plant Extracts; D019343:Citric Acid; D008274:Magnesium; D000645:Ammonium Sulfate; D013831:Thiamine