title: Optimization of culture conditions for flexirubin production by Chryseobacterium artocarpi CECT 8497 using response surface methodology.
abstract: Flexirubins are the unique type of bacterial pigments produced by the bacteria from the genus Chryseobacterium, which are used in the treatment of chronic skin disease, eczema etc. and may serve as a chemotaxonomic marker. Chryseobacterium artocarpi CECT 8497, an yellowish-orange pigment producing strain was investigated for maximum production of pigment by optimizing medium composition employing response surface methodology (RSM). Culture conditions affecting pigment production were optimized statistically in shake flask experiments. Lactose, l-tryptophan and KH2PO4 were the most significant variables affecting pigment production. Box Behnken design (BBD) and RSM analysis were adopted to investigate the interactions between variables and determine the optimal values for maximum pigment production. Evaluation of the experimental results signified that the optimum conditions for maximum production of pigment (521.64 mg/L) in 50 L bioreactor were lactose 11.25 g/L, l-tryptophan 6 g/L and KH2PO4 650 ppm. Production under optimized conditions increased to 7.23 fold comparing to its production prior to optimization. Results of this study showed that statistical optimization of medium composition and their interaction effects enable short listing of the significant factors influencing maximum pigment production from Chryseobacterium artocarpi CECT 8497. In addition, this is the first report optimizing the process parameters for flexirubin type pigment production from Chryseobacterium artocarpi CECT 8497.
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
authors.forename: Chidambaram Kulandaisamy
authors.initials: CK
authors.lastname: Venil
authors.affiliation: Institute of Bioproduct Development, UniversitiTeknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
authors.forename: Zainul Akmar
authors.initials: ZA
authors.lastname: Zakaria
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
authors.forename: Wan Azlina
authors.initials: WA
authors.lastname: Ahmad
mesh_terms: D061249:Batch Cell Culture Techniques; D019149:Bioreactors; D045247:Chryseobacterium / Q000254:growth & development / Q000378:metabolism*; D003470:Culture Media / Q000737:chemistry* / Q000378:metabolism; D005285:Fermentation; D007218:Industrial Microbiology / Q000295:instrumentation / Q000379:methods*; D007785:Lactose / Q000378:metabolism; D015233:Models, Statistical; D011090:Polyenes / Q000378:metabolism*; D015203:Reproducibility of Results; D014364:Tryptophan / Q000378:metabolism
chemical_list: D003470:Culture Media; D011090:Polyenes; C017313:flexirubins; D014364:Tryptophan; D007785:Lactose