Biotechnological potential of microorganisms isolated from the salar del hombre muerto, Argentina

被引:2
作者
Lopez, Marta Florencia [1 ,2 ]
Martinez, Fabiana Lilian [1 ]
Rajal, Veronica Beatriz [1 ,2 ,3 ]
Irazusta, Veronica Patricia [1 ,4 ]
机构
[1] Univ Nacl Salta UNSa, Consejo Nacl Invest Cient & Tecn CONICET, Inst Invest Ind Quim INIQUI, RA-4400 Salta, Argentina
[2] Univ Nacl Salta UNSa, Fac Ingn, RA-4400 Salta, Argentina
[3] Nanyang Technol Univ, Singapore Ctr Environm Life Sci Engn SCELSE, Singapore 637551, Singapore
[4] Univ Nacl Salta UNSa, Fac Ciencias Nat, RA-4400 Salta, Argentina
来源
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS | 2023年 / 95卷 / 01期
关键词
Halotolerant; enzymes; carotenoids; bioemulsifiers; exopolysaccharides; HALOPHILIC BACTERIA; CAROTENOID PRODUCTION; ENVIRONMENTS; DIVERSITY; OIL; EXOPOLYSACCHARIDES; BIODEGRADATION; BIOREMEDIATION; DEGRADATION; ADAPTATION;
D O I
10.1590/0001-3765202320211199
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Bacterial strains were isolated from soil and aqueous solution samples from the Salar del Hombre Muerto, Argentina. A total of 141 strains were characterized and the tolerance to sodium chloride was evaluated. We performed a screening to search for molecules of biotechnological interest: carotenoids (11%), emulsifiers (95%), and exopolysaccharides (6%), and to assess the production of enzymes, including proteolytic (39%), lipolytic (26%), hemolytic (50%), and catalase activities (99%); 25 bacterial strains were selected for further studies. Some of them produced biofilms, but only Bacillus sp. HA120b showed that ability in all the conditions assayed. Although 21 strains were able to form emulsions, the emulsifying index Kocuria sp. M9 and Bacillus sp. V3a cultures were greater than 50% and, emulsions were more stable when the bacteria grew in higher salt concentrations. Only pigmented Kocuria sp. M9 showed lipolytic activity on olive oil medium and was able to produce biofilms when cultured without and with 4 M of NaCl. Yellow pigments, lipase activity, and biosurfactant production were observed for Micrococcus sp. SX120. Summarizing, we found that the selected bacteria produced highly interesting molecules with diverse industrial applications and, many of them are functional in the presence of high salt concentrations.
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页数:16
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