Macro and microelements in determination of different forms of ellagic acid in by products from strawberry processing
2010
Klimczak, E. | Krol, B.,Politechnika Lodzka, Lodz (Poland). Inst. Chemicznej Technologii Zywnosci
The objective of the research was to select a solvent and the conditions for extracting ellagitanins (ET) from dried by-products from strawberry processing, as well as to develop a method for hydrolyzing allagic acid (EA) esters in glycerol solutions of trifluoroacetic acid(TFA). Another equal objective was to determine the free and bond EA in some selected by products from strawberry processing. The results obtained constituted a basis for the calculation of the ET content in the analyzed plant materials. It was evidenced that a 70 percent aqueous acetone solution, applied at a room temperature to at least three-step extraction, made it possible to satisfactorily isolate EA and ET from dried strawberry pomace and from post extraction, strawberry achenes defatted under a supercritical CO2 extraction process. It was found that, in the dried industrial seedless strawberry pomace, the content of free EA was below 100mg/100g and the content of released EA was about 900mg/100g, whereas the percent content of ET was 1,4 percent m/m
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