Boosting TAG Accumulation with Improved Biodiesel Production from Novel Oleaginous Microalgae Scenedesmus sp. IITRIND2 Utilizing Waste Sugarcane Bagasse Aqueous Extract (SBAE).

Abstract

This investigation utilized sugarcane bagasse aqueous extract (SBAE), a nontoxic, cost-effective medium to boost triacylglycerol (TAG) accumulation in novel fresh water microalgal isolate Scenedesmus sp. IITRIND2. Maximum lipid productivity of 112 ± 5.2mg/L/day was recorded in microalgae grown in SBAE compared to modified BBM (26 ± 3%). Carotenoid to chlorophyll ratio was 12.5 ± 2% higher than in photoautotrophic control, indicating an increase in photosystem II activity, thereby increasing growth rate. Fatty acid methyl ester (FAME) profile revealed presence of C14:0 (2.29%), C16:0 (15.99%), C16:2 (4.05%), C18:0 (3.41%), C18:1 (41.55%), C18:2 (12.41), and C20:0 (1.21%) as the major fatty acids. Cetane number (64.03), cold filter plugging property (-1.05°C), and oxidative stability (12.03h) indicated quality biodiesel abiding by ASTM D6751 and EN 14214 fuel standards. Results consolidate the candidature of novel freshwater microalgal isolate Scenedesmus sp. IITRIND2 cultivated in SBAE, aqueous extract made from copious, agricultural waste sugarcane bagasse to increase the lipid productivity, and could further be utilized for cost-effective biodiesel production.