Abstract:

In order to explore the effect of selenium enrichment on nutritional compositions of Rhodopseudomonas palustris, general nutrients, amino acids, vitamin B family, nicotinic acid, β-caroteneare, superoxide dismutase (SOD) and catalase (CAT) in selenium-enriched Rhodopseudomonas palustris (sRP) and normal Rhodopseudomonas palustris (nRP) were compared. Results indicated that the contents of protein, soluble sugar and crude fat of sRP were higher than those of nRP, which exhibited an enhancement by 9.10%, 5.13% and 42.86%, respectively. Whereas, the ash content of sRP was lower than that of nRP with a decrease by 23.73%. In addition, totally 17 amino acids were detected in sRP, while only 16 amino acids was detected in nRP. Moreover, the contents of amino acids in sRP were much higher than those in nRP, especially for methionine and lysine with an increase by 100% and 9.2%, respectively. Vitamin B2, vitamin B6, nicotinic acid and carotenoid in sRP were 6.45%, 5.77%, 7.20% and 45.08%, which were also higher than those in nRP, respectively. However, the content of vitamin B1 in sRP was lower than nRP. The activities of SOD and CAT in sRP exhibited an enhancement of 158.43% and 54.51% when compared with those in nRP. Therefore, selenium-enrichment can improve nutritional quality of Rhodopseudomonas palustris.

Key words: selenium-enrichment, Rhodopseudomonas palustris, nutritional component, evaluation