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International Journal on Algae
SJR: 0.229 SNIP: 0.261 CiteScore™: 0.24

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v9.i4.40
pages 350-358

Antibacterial activity and biomolecular composition of certain fresh water microalgae collected from River Godavari (India)

M. Jaya Prakash Goud
Microbial culture collection laboratory, Department of Microbiology, Kakatiya University, Warangal-506 009, A.P., India
D. Seshikala
Microbial culture collection laboratory, Department of Microbiology, Kakatiya University, Warangal-506 009, A.P., India
M. A. Singara Charya
Microbial culture collection laboratory, Department of Microbiology, Kakatiya University, Warangal-506 009, A.P., India

ABSTRACT

The microalgae are of significant attraction as natural source of bioactive molecules. Twenty-four different fresh water algal species were screened for their antibacterial activity and biomolecules. Bactericidal activity was tested against two gram+ve and four gram−ve bacteria. Maximum antibacterial activity was observed in methanol extracts and least in aqueous extracts. Maximum activity (14 mm) was observed in the extracts of Nostoc, Lyngbya, Mougeotia and Pithophora sp. Gram-positive bacteria were more susceptible than gram-negative bacteria. Thirteen algal species are associated with tannins and phenols, 11 species with steroids, 5 species with flavonoids and 8 species with saponins. Maximum chlorophyll a was recorded with Ulothrix (5.6 mg/g) and least in Tolypothrix (0.5 mg/g). Chlorophyll b was recorded maximum in Vaucheria (4.2 mg/g) and least in Cylindrospermum (0.6 mg/g). Maximum carotenoid content is recorded in Ulothrix (4.5 mg/g) and least in Tolypothrix and Oscillatoria (0.6 mg/g). Range of protein content is 4−20% with maximum yield in Cylindrospermum sp. (20%) and least in Hydrodictyon (4%). Carbohydrate content ranged from 14−35% with maximum yield in Mougeotia (35%) and least in Tolypothrix (14%). Their pharmacological activities and bioactive molecules can be highly exploited.