Growth characteristics and antioxidant properties of the benthic diatom Navicula incerta (Bacillariophyceae) from Jeju Island, Korea SCIE SCOPUS

Cited 11 time in WEB OF SCIENCE Cited 11 time in Scopus
Title
Growth characteristics and antioxidant properties of the benthic diatom Navicula incerta (Bacillariophyceae) from Jeju Island, Korea
Author(s)
Affan, A.; Karawita, R.; Jeon, Y.-J.; Lee, J.-B.
Publication Year
2007-08
Abstract
Benthic diatoms are a commonly used food source in shellfish aquaculture. Diatoms of the genus Navicula are the most abundant benthic diatoms occurring year-round on the coast of Jeju Island, Korea. We isolated an axenic strain of N. incerta Grunow; estimated its growth characteristics under 27 different combinations of temperature, salinity, and nutrients; and determined its biochemical composition and antioxidant activities. The maximum specific growth rate (μmax), defined as the increase in cell density per unit time, was 0.81-1.04·d-1, and the maximum cell density, 7.99 × 105 cells·mL-1, was reached at 0.88·d-1 μmax, 20°C, 30 psu salinity, and F/2 nutrient concentration on day 12 of the culture period. The approximate cellular composition was as follows: 7.0 ± 0.04% protein, 1.7 ± 0.28% lipid, 12.8 ± 0.85% carbohydrate, 68.4 ± 0.09% ash, and 10.1 ± 0.44% moisture. The antioxidant properties of N. incerta were determined for various extracts. The rates of 1,1-diphenyl-2-picrylhydrazyl (DPPH) free-radical scavenging for Neutrase and methanol extracts were 81.6% and 62.8%, respectively. Flavourzyme extract had a superoxide-scavenging rate of 57.7%. Kojizyme and Ultraflo extracts had nitric-oxide-scavenging rates of 42.2% and 40.6%, respectively, significantly higher than commercial antioxidants, such as α-tocopherol and butylated hydroxytoluene (BHT). The metal-chelating activities of the methanol, Neutrase, and Termamyl extracts were 68.5%, 45.2%, and 41.2%, respectively, four to six times higher than commercial antioxidants. The Termamyl extract showed the highest linoleic acid peroxidation inhibition, exceeding α-tocopherol and on par with BHT. © 2007 Phycological Society of America.
ISSN
0022-3646
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4660
DOI
10.1111/j.1529-8817.2007.00367.x
Bibliographic Citation
Journal of Phycology, v.43, no.4, pp.823 - 832, 2007
Publisher
Blackwell Publishing Inc.
Keywords
Antioxidant activities; Benthic diatoms; Growth characteristics; Mass culture; Navicula
Type
Article
Language
English
Document Type
Article
Publisher
Blackwell Publishing Inc.
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