Extraction of catechins from decaffeinated green tea for development of nanoemulsion using palm oil and sunflower oil based lipid carrier systems.

Pravin Vasantrao, Gadkari and Manohar, B. (2015) Extraction of catechins from decaffeinated green tea for development of nanoemulsion using palm oil and sunflower oil based lipid carrier systems. Journal of Food Engineering, 147. pp. 14-23.

PDF Journal of Food Engineering, Volume 147, February 2015, Pages 14-23.pdf - Published Version Restricted to Registered users only Download (1MB)

Abstract

Catechins were extracted using hot water at various temperatures from supercritical CO2 decaffeinated green tea. The catechins extract were encapsulated at a concentration of 0.1% (w/w) in lipid based nanoemulsion delivery systems using sunflower oil and palm oil with the combination of hydrophilic and lipophilic emulsifiers. Four different formulations were prepared in a two-step process involving high shear and high pressure homogenization. The formulations were characterized for their physicochemical properties such as mean emulsion size, pH, conductivity, refractive index, peroxide value and physical stability under accelerated aging. The presence of catechins in the encapsulated matrix was confirmed by conducting different chemical assays. The oxidation of nanoemulsions was successfully arrested by the catechins in all the formulations. Physically and chemically stable emulsions were obtained from sunflower oil with no significant variation in droplet diameter, conductivity, refractive index and pH up to 14 days.

Item Type:	Article
Uncontrolled Keywords:	Supercritical CO2 decaffeinated green tea Catechins High pressure homogenizer Nanoemulsion Physicochemical stability
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 18 Flavonoid Chemistry 600 Technology > 07 Beverage Technology > 08 Tea
Divisions:	Food Engineering
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	16 Oct 2014 09:52
Last Modified:	16 Oct 2014 09:52
URI:	http://ir.cftri.res.in/id/eprint/11662

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