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Volume 48 Number 5
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Volume 48 Number 4 Volume 48 Number 5

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Research articles

ScienceAsia 48 (2022): 509-517 |doi: 10.2306/scienceasia1513-1874.2022.072

Enhanced production of poly-3-hydroxybutyrate and carotenoids by Arthrospira platensis under combined glycerol and phosphorus supplementation

Khomson Satchasataporna, Chanchanok Duangsria, Winai Charunchaipipata, Surasak Laloknamb, Surachet Burut-Archanaic,d, Sorawit Powtongsookc,d, Nattaphong Akrimajirachootee, Wuttinun Raksajita,*

ABSTRACT:     Arthrospira platensis is one of the most beneficial cyanobacteria due to its high protein content and highvalue compounds such as poly-3-hydroxybutyrate (PHB) and carotenoids which can be used in promoting health in many sectors. A. platensis cultivation can be performed using urban or industrial wastewater as a source of nutrients, including glycerol and phosphorus. The objective of this study was to enhance biomass, pigments, and partial PHB in A. platensis IFRPD1182 grown under different glycerol and phosphorus concentrations. The highest values of biomass, carotenoids, and PHB production were observed in cells grown in the G3 P3 medium supplemented with 4.6 g/l glycerol and 356 mg/l phosphorus on the fifth day of cultivation with maximal values of 1.90?0.03 mg/ml, 6.30?0.12 mg/l, and 34.76?2.71 mg/l, respectively. In addition, RT-PCR analysis revealed that the cells grown in G3 P3 medium increased crtB and crtP transcripts, encoding phytoene synthase and phytoene desaturase, respectively, and involved in carotenoid biosynthesis with 1.47- and 1.50-fold increases, respectively. This indicates that the increased expression of crtB and crtP genes in the cells can be achieved by a combination of glycerol and phosphorus, where the carotenoids were highly accumulated.

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a Program of Animal Health Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900 Thailand
b Department of General Science, Faculty of Science, Srinakharinwirot University, Bangkok 10110 Thailand
c Center of Excellence for Marine Biotechnology, Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
d National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathum Thani 12120 Thailand
e Department of Physiology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900 Thailand

* Corresponding author, E-mail: cvtwnr@ku.ac.th

Received 6 Aug 2021, Accepted 27 Feb 2022