51. Microwave-assisted extraction of phenolic compounds from grape seed.
- Author
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Hong N, Yaylayan VA, Raghavan GS, Paré JR, and Bélanger JM
- Subjects
- Antioxidants analysis, Fats analysis, Fats isolation & purification, Fruit chemistry, Fruit radiation effects, Hydrolyzable Tannins analysis, Methanol, Microwaves, Plant Extracts chemistry, Polyphenols, Seeds radiation effects, Time Factors, Vitis radiation effects, Water analysis, Antioxidants isolation & purification, Flavonoids, Phenols analysis, Phenols isolation & purification, Polymers analysis, Polymers isolation & purification, Seeds chemistry, Vitis chemistry
- Abstract
A microwave-assisted extraction technique was developed to optimize the extraction of phenolic compounds from grape seeds. The microwave power (300-150W) and time of extraction (20-200s) were varied during the optimization process. The polyphenol content of the resulting extracts were measured as mg of tannic acid equivalent per gram of crude extract (mg TAE/g of crude extract), using a Folin-Ciocalteau reagent. In general, neither the time nor the power had a significant effect on the overall % yield (average of 13.5%) and on the polyphenol content (392 mg TAE/g of crude extract) of the extracts. However, when the solvent polarity was changed by the addition of 10% water, the yield increased to 15.2% and the polyphenol content increased to 429 mg TAE/g of crude extract.
- Published
- 2001
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