title: Effect of CO2Concentration on Growth and Biochemical Composition of Newly Isolated Indigenous Microalga Scenedesmus bajacalifornicus BBKLP-07.
abstract: Photosynthetic mitigation of CO2through microalgae is gaining great importance due to its higher photosynthetic ability compared to plants, and the biomass can be commercially exploited for various applications. CO2fixation capability of the newly isolated freshwater microalgae Scenedesmus bajacalifornicus BBKLP-07 was investigated using a 1-l photobioreactor. The cultivation was carried at varying concentration of CO2ranging from 5 to 25%, and the temperature and light intensities were kept constant. A maximum CO2fixation rate was observed at 15% CO2concentration. Characteristic growth parameters such as biomass productivity, specific growth rate, and maximum biomass yield, and biochemical parameters such as carbohydrate, protein, lipid, chlorophyll, and carotenoid were determined and discussed. It was observed that the effect of CO2concentration on growth and biochemical composition was quite significant. The maximum biomass productivity was 0.061 ± 0.0007 g/l/day, and the rate of CO2fixation was 0.12 ± 0.002 g/l/day at 15% CO2concentration. The carbohydrate and lipid content were maximum at 25% CO2with 26.19 and 25.81% dry cell weight whereas protein, chlorophyll, and carotenoid contents were 32.89% dry cell weight, 25.07 μg/ml and 6.15 μg/ml respectively at 15% CO2concentration.
authors.affiliation: Department of Microbiology and Biotechnology, Karnatak University, Dharwad, Karnataka, 580003, India.
authors.forename: Lakkanagouda
authors.initials: L
authors.lastname: Patil
authors.affiliation: Department of Microbiology and Biotechnology, Karnatak University, Dharwad, Karnataka, 580003, India. b_kaliwal@yahoo.com.|Department of Microbiology, Davangere University, Davangere, Karnataka, 577002, India. b_kaliwal@yahoo.com.
authors.forename: Basappa
authors.identifier: http://orcid.org/0000-0002-2545-5621
authors.initials: B
authors.lastname: Kaliwal
mesh_terms: D020418:Algal Proteins / Q000096:biosynthesis; D018533:Biomass; D057486:Carbon Cycle / Q000187:drug effects* / Q000502:physiology; D002245:Carbon Dioxide / Q000378:metabolism / Q000494:pharmacology*; D002338:Carotenoids / Q000096:biosynthesis; D002734:Chlorophyll / Q000096:biosynthesis; D005618:Fresh Water; D008027:Light; D008055:Lipids / Q000096:biosynthesis; D058433:Photobioreactors; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology / Q000528:radiation effects; D044444:Scenedesmus / Q000187:drug effects* / Q000378:metabolism / Q000528:radiation effects; D013696:Temperature
chemical_list: D020418:Algal Proteins; D008055:Lipids; D002734:Chlorophyll; D002245:Carbon Dioxide; D002338:Carotenoids
keywords: Biochemical parameter; CO2 fixation; Green algae; Growth kinetics; Scenedesmus bajacalifornicus