β-Carotene Production by Sporobolomyces pararoseus TISTR5213 Using Crude Glycerol as the Sole Carbon Source

• Main Authors: Atchara Manowattana", Charin Techapun, Phisit Seesuriyachan, Prasert Hanmoungjai, Thanongsak Chaiyaso
• Language: English
• Published: Science Faculty of Chiang Mai University 2019
• Subjects: biodiesel by-products; carotenoids; central composite design (CCD); Plackett-Burman design; red yeasts
• Online Access: http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=5512; http://cmuir.cmu.ac.th/jspui/handle/6653943832/66823
• Institution: Chiang Mai University

Recycling crude glycerol obtained from biodiesel production process has challenges, particularly as this glycerol is not suitable for foods and cosmetics applications. Therefore, nine strains of red yeasts from the culture collection of the Thailand Institute of Scientific and Technological Research (TISTR) were screened for β-carotene production in the basal medium supplemented with either pure glycerol (BMP) or crude glycerol (BMC) as the sole carbon source. The results revealed that Sporobolomyces pararoseus TISTR5213 showed the maximum β-carotene production yield of 0.62±0.05 and 1.17±0.01 mg/L in BMP and BMC, respectively. Variable medium components of BMC were selected in accordance with the Plackett-Burman experimental design with only one factor of crude glycerol being significant. The optimal conditions for physical factors (pH and temperature levels) were then combined in further studies through the response surface methodology approach. A quadratic model was constructed by central composite design (CCD). Using this experimental design, the β-carotene production yield increased from 1.17 to 27.41 mg/L or about 23 times higher than non-optimized BMC. The optimal conditions to achieve the maximum β-carotene yield were; crude glycerol 55.04 g/L, initial pH at 5.63 and 24.01°C for 5 days.