ABSTRACT
Cyanobacterial pigments such as chlorophyll, carotenoids and phycobiliproteins are considered as ecofriendly natural colourants used in food and food additives as they have nutraceutical value, non-toxic and non-carcinogenic. The present study focused on extraction, partial characterization of extracellular polysaccharides (EPS), phycocyanin and mycosporin like amino acid (MAA) from a freshwater cyanobacterium Oscillatoria pseudogeminata G.Schmid.The purified isolate of O.pseudogeminatawas deposited and maintained in the NRMC-F, Bharathidasan University. The EPS was extracted withthe help of double volume of ice-cold acetone and confirmed by UV (260 and 280 nm), FTIR and XRD analyses.Phycocyanin and MAA were also extracted from O. pseudogeminata biomass using double distilled water. The UV-VisSpectrophotometric results revealed that 520 and 230 nm peaks represent phycocyanin and MAA, respectively. Further, theprocess of scaling-up the biomass and increase the productivity of EPS, Phycocyanin and MAA from Oscillatoriapseudogeminata is under raceway pond system, already initialed in our laboratory.
ABSTRACT
Se evaluaron las propiedades del color y la estabilidad a diferentes factores (temperatura y pH) de soluciones de los antranoides prenilados ferruginina A (FRA) y ?-hidroxiferruginina A (HFA), obtenidos a partir de las bayas de las especies Vismia guianensis y V. baccifera ssp. ferruginea. El estudio de la influencia de la temperatura sobre las características espectrales reveló que las soluciones en propilenglicol de la FRA y la HFA son relativamente estables al calor a las temperaturas de 50 y 80 °C , mientras que a 100 y 150 °C presentaron cambios ligeros en la intensidad (e) y tonalidad (?vis-max, coordenadas colorimétricas CIE L* a* b*). Adicionalmente, las variaciones del color (?vis-max, e) para los antranoides en el rango de pH 1,0-11,0 durante 60 días de almacenamiento a 4 y 25 °C , demostraron una mayor estabilidad del color en condiciones de refrigeración y pH 6,0 y 8,0, la cual fue superior para las soluciones de HFA. Las buenas características de los compuestos los hacen potencialmente útiles como colorantes naturales en la industria de los cosméticos, textil y farmacológica.
Colour properties and stability to different factors (temperature and pH) of solutions of prenylated anthranoids ferruginin A (FRA) and ? -hydroxyferruginin A (HFA), obtained from berries of Vismia guianensis and V. baccifera ssp. ferruginea, were evaluated. Spectral characteristics influenced by different temperatures, revealed that the solutions in propylenglycol of the FRA and HFA were relatively stable to the heat to temperatures of the 50 and 80 °C , whereas to temperatures of 100 and 150 °C they displayed slight changes in the intensity ( e ) and tonality ( ? vis-max, colorimetric co-ordinates in the CIE L* a* b* scale). Additionally, colour variation ( ? vis-max, e ) for both anthranoids in the pH range 1.0 - 11.0 during a period of 60 days storage at 4 and 25 °C , showed higher colour stability in refrigerated conditions and pH values of 6.0 and 8.0, being better for solutions of HFA. The good characteristics of compounds make them potentially useful like natural colourants in the textile, cosmetic and pharmacological industry.
Foram avaliadas as propriedades da cor e a estabilidade de fatores diferentes (temperatura e pH) de soluções dos antranoides prenilados ferruginina A (FRA) e ? -hidroxiferruginina A (HFA), obtidos das bagas das espécies Vismia guianensis e V. baccifera ssp. ferruginea. O estudo da influência da temperatura nas características espectrais mostra que as soluções em etilenglicol da FRA e a HFA foram relativamente estáveis ao calor para as temperaturas de 50 e 80 °C , enquanto para temperaturas de 100 e 150 °C apresentaram mudanças leves na intensidade ( e ) e tonalidade ( ? vis-max, coordenadas CIE L* a* b*). Além do mais, as variações da cor ( ? vis-max, e ) dos antranoides no rango de pH 1,0-11,0 durante 60 dias de armazenamento a 4 e 25 °C mostraram uma estabilidade maior em condições refrigerasão e em valores de pH de 6,0 e de 8,0, sendo melhor para soluções do HFA. As características boas dos compostos os fazem potencialmente úteis como corantes naturais nas indústrias das cosméticas, têxtil e farmacêutica.