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All Journal Biodiversitas Journal of Biological Diversity
AIYA CHANTARASIRI
Faculty of Science, Energy and Environment, King Mongkut's University of Technology North Bangkok. Rayong Campus, Rayong 21120, Thailand
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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The oleaginous yeast Pichia manshurica isolated from Lansium domesticum fruit in Thailand and its fatty acid composition of single cell oil SONGSAK PLANONTH; AIYA CHANTARASIRI
Biodiversitas Journal of Biological Diversity Vol. 23 No. 2 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d230226

Abstract

Abstract. Planonth S, Chantarasiri A. 2022. The oleaginous yeast Pichia manshurica isolated from Lansium domesticum fruit in Thailand and its fatty acid composition of single cell oil. Biodiversitas 23: 801-809. Oleaginous microbes can accumulate intracellular lipids or single cell oils (SCOs) in quantities higher than 20% of their biomass. They can be a sustainable alternative to fossil fuels, biofuels, and oleochemicals. Studies concerning efficient oleaginous yeasts isolated from the natural environments remain scarce. Therefore, this study isolated and screened for efficient oleaginous yeasts from the surfaces of longkong fruit (Lansium domesticum) samples in Thailand. Their intracellular SCOs were extracted using an ultrasonic-assisted extraction (UAE) method and quantitatively analyzed. The SCO-accumulating yeasts (produce the amount of SCOs <20 % of their biomass) genetically identified were Candida jaroonii, Meyerozyma caribbica, Kodamaea ohmeri, and Pichia sp., while the oleaginous yeasts (produce the amount of SCOs >20% of their biomass) identified were Pichia manshurica and Hanseniaspora opuntiae. Several isolated yeasts were designated as rare oleaginous microbes. The P. manshurica strain Y2 was considered as the most effective oleaginous yeast with a SCO content of 43.03% (w/w). The fatty acids in the accumulated SCO of this strain were analyzed by gas chromatography (GC) that consisted of palmitic, stearic, oleic, linoleic, and palmitoleic acids. These fatty acids could be further applied in the production of third-generation biodiesel, cocoa butter equivalents, and related high-value oleochemicals.
Diversity and activity of amylase-producing bacteria isolated from mangrove soil in Thailand RATIMA KLINFOONG; CHANUNLAYA THUMMAKASORN; SUNISA UNGWIWATKUL; PARIMA BOONTANOM; AIYA CHANTARASIRI
Biodiversitas Journal of Biological Diversity Vol. 23 No. 10 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d231064

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Abstract. Klinfoong R, Thummakasorn C, Ungwiwatkul S, Boontanom P, Chantarasiri A. 2022. Diversity and activity of amylase-producing bacteria isolated from mangrove soil in Thailand. Biodiversitas 23: 5519-5531. Mangrove forests are a potential ecosystem for the isolation of various economic enzymes derived from mangrove-associated bacteria. The knowledge of amylase-producing bacteria isolated from mangrove forests in the Southeast Asian region has been scarce. This study aimed to investigate the isolation, genetic identification, and activity characterization of amylase-producing bacteria from mangrove soils in Thailand. The amylase-producing bacteria isolated from mangrove soils in the present were genetically belong to the genera Bacillus, Desulfurella, Peribacillus, Priestia, and Pseudomonas. Several amylase-producing bacteria such as Bacillus proteolyticus, Desulfurella, Pseudomonas entomophila, and Pseudomonas putida found in this study have hardly ever been reported. The Bacillus paralicheniformis strain DNP0507 was the most active amylolytic bacterium with 2.395 ± 0.133 U/mg of amylase activity. The optimum temperature and pH for amylolytic activity were determined to be 50°C at a pH of 7.0 with a thermal stability range of 20-60°C at a neutral pH of 7.0-8.0. The enzyme activity was significantly enhanced by Cu2+, Co2+, and Pb2+ and was inhibited considerably by a chelating agent EDTA. Finally, the most active amylolytic B. paralicheniformis strain DNP0507 could be applied in baking industries, food industries, and starchy waste valorization.
Co-Authors CHANUNLAYA THUMMAKASORN PARIMA BOONTANOM RATIMA KLINFOONG SONGSAK PLANONTH SUNISA UNGWIWATKUL