title: Influence of daily collection and culture medium recycling on the growth and beta-carotene yield of Dunaliella salina.
abstract: The halophilic green alga Dunaliella salina has the potential to be cultivated for beta-carotene-rich biomass, however, open-air systems need to be further improved in order to become more competitive and more economical, rather than leave the major beta-carotene consuming market derived from artificially synthesis. A set of daily collection ratios was designed and scaled up with the aim to harvest cell biomass and beta-carotene from D. salina at logarithmic phase; the yields were comparable to the normal culture without daily removal of culture. Daily collection of 1/7.5 volume of algal culture was found to be appropriate to keep the balance between the cell biomass and beta-carotene accumulation. Light intensity as one of the important factors would affect both cell growth and beta-carotene content synchronously. Further, the method of recycling 1/7.5 volume of culture after removal of algae cells was developed in order to decrease input cost for the effective production of beta-carotene, and both the resulting yields of the cell biomass and beta-carotene gained an advantage over those from the normal D. salina culture.
authors.affiliation: College of Food and Bioengineering, South China University of Technology, Guangzhou, China.
authors.forename: Yue-Hui
authors.initials: YH
authors.lastname: Zhu
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Jiang
authors.forename: Qian
authors.initials: Q
authors.lastname: Chen
mesh_terms: D018533:Biomass; D002455:Cell Division; D000460:Chlorophyta / Q000254:growth & development* / Q000378:metabolism*; D003470:Culture Media; D008027:Light; D013696:Temperature; D013997:Time Factors; D019207:beta Carotene / Q000096:biosynthesis*
chemical_list: D003470:Culture Media; D019207:beta Carotene