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Development of a Cranberry Standard for Quantification of Insoluble Cranberry ( Ait.) Proanthocyanidins. | LitMetric
Cranberry proanthocyanidins (PACs) can be partitioned into soluble PACs, which are extracted with solvents, and insoluble PACs, which remain associated with fibers and proteins after extraction. Most research on cranberry products only quantifies soluble PACs because proper standards for quantifying insoluble PACs are lacking. In this study, we evaluated the ability of a cranberry PAC (c-PAC) standard, reflective of the structural heterogeneity of PACs found in cranberry fruit, to quantify insoluble PACs by the butanol-hydrochloric acid (BuOH-HCl) method. For the first time, a c-PAC standard enabled conversion of BuOH-HCl absorbance values (550 nm) to a weight (milligram) basis, allowing for quantification of insoluble PACs in cranberries. The use of the c-PAC reference standard for sequential analysis of soluble PACs by the method of 4-(dimethylamino)cinnamaldehyde and insoluble PACs by the method of BuOH-HCl provides analytical tools for the standardization of cranberry-based ingredients.
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