TLC separation of carotenoid extracts from different inhibitor treated cultures of microalgae and standards. (lane I)Lutein standard, (lane II) β-carotene standard, (lane III) Astaxanthin standard, (lane IV) DPA, (lane V) Nicotene, (lane VI) Control, (lane VII) Basta, (lane VIII) DCMU, (lane IX) Caffeine and (lane X) Glyphosate respectively, [(a) represent light intensity of 35.0 ± 2.5 μmol m-2 s-1, (b) represent light intensity of 75.0 ± 2.5 μmol m-2 s-1]