Recently, with the advent of modern technologies, various marine organisms are being studied for their bioactive compounds. Antimicrobial substances secreted by algae are attracting considerable attention due to the necessity of finding new substances effective on both classical microorganisms and new pathogens In the present study the antimicrobial activity of the lipidic extract of the green seaweed Cladophora rupestris collected in a Mediterranean area in two sampling periods (January and April) was assayed. The chemical characterization of the lipidic fractions was performed by gas-cromatatography and multinuclear and multidimensional NMR spectroscopy. In the lipidic extract of C. rupestris collected in January an antibacterial activity against Enterococcus sp., Streptococcus agalactiae and Vibrio cholerae non-O1 was recorded; by contrast, bacterial inhibition was measured on several Vibrio species only in April. The fatty acid profile of C. rupestris lipidic extract, analyzed by gas chromatography, resulted mainly composed of palmitic, myristic, oleic, ? linolenic, palmitoleic and linoleic acids. Moreover, since ?-linolenic acid was the predominant ?3 fatty acid in April, we suggest its involvement in the antibacterial activity observed in this month, taking also into account that pure ?-linolenic acid resulted effective towards vibrios strains. Cladophora rupestris fatty acid profile revealed also an interesting composition in polyunsaturated fatty acids in both the considered periods with the ?6/?3 ratio lower than 1, leading to conclude that this macroalga may be employed as a natural source of ?3. Finally, the 1H NMR spectrum in CDCl3 of algal lipid fractions showed the characteristic signals of saturated (SAFAs) and unsaturated fatty acids (UFAs) as well as other metabolites and a marked difference in free fatty acids (FFAs) content for the two examined algal lipid fractions. It is noteworthy that C. rupestris lipidic extracts show, by NMR spectroscopy, the signal pattern of poly hydroxy butirrate, a natural biocompatible and biodegradable polymer. In conclusion, on account of its antimicrobial activity, nutritional value and bioplastic content, C. rupestris lipidic extract can be considered a promising source for future biotechnological applications.
Biotechnological potential of the seaweed Cladophora rupestris (Chlorophyta, Cladophorales) lipidic extract
Stabili L;Acquaviva MI;Biandolino F;Cavallo RA;Narracci M;Cecere E;Petrocelli A
2014
Abstract
Recently, with the advent of modern technologies, various marine organisms are being studied for their bioactive compounds. Antimicrobial substances secreted by algae are attracting considerable attention due to the necessity of finding new substances effective on both classical microorganisms and new pathogens In the present study the antimicrobial activity of the lipidic extract of the green seaweed Cladophora rupestris collected in a Mediterranean area in two sampling periods (January and April) was assayed. The chemical characterization of the lipidic fractions was performed by gas-cromatatography and multinuclear and multidimensional NMR spectroscopy. In the lipidic extract of C. rupestris collected in January an antibacterial activity against Enterococcus sp., Streptococcus agalactiae and Vibrio cholerae non-O1 was recorded; by contrast, bacterial inhibition was measured on several Vibrio species only in April. The fatty acid profile of C. rupestris lipidic extract, analyzed by gas chromatography, resulted mainly composed of palmitic, myristic, oleic, ? linolenic, palmitoleic and linoleic acids. Moreover, since ?-linolenic acid was the predominant ?3 fatty acid in April, we suggest its involvement in the antibacterial activity observed in this month, taking also into account that pure ?-linolenic acid resulted effective towards vibrios strains. Cladophora rupestris fatty acid profile revealed also an interesting composition in polyunsaturated fatty acids in both the considered periods with the ?6/?3 ratio lower than 1, leading to conclude that this macroalga may be employed as a natural source of ?3. Finally, the 1H NMR spectrum in CDCl3 of algal lipid fractions showed the characteristic signals of saturated (SAFAs) and unsaturated fatty acids (UFAs) as well as other metabolites and a marked difference in free fatty acids (FFAs) content for the two examined algal lipid fractions. It is noteworthy that C. rupestris lipidic extracts show, by NMR spectroscopy, the signal pattern of poly hydroxy butirrate, a natural biocompatible and biodegradable polymer. In conclusion, on account of its antimicrobial activity, nutritional value and bioplastic content, C. rupestris lipidic extract can be considered a promising source for future biotechnological applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
