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Quantification of cranberry proanthocyanidins by normal‐phase high‐performance liquid chromatography using relative response factors
Author(s) -
Sintara Marsha,
Wang Yifei,
Li Lin,
Liu Haiyan,
Cunningham David G.,
Prior Ronald R.,
Chen Pei,
Chang Tony,
Wu Xianli
Publication year - 2020
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.2952
Subject(s) - chemistry , proanthocyanidin , chromatography , high performance liquid chromatography , detection limit , mass spectrometry , vaccinium , cranberry juice , reversed phase chromatography , urinary system , biochemistry , polyphenol , antioxidant , botany , medicine , biology , endocrinology
American cranberries ( Vaccinium macrocarpon ) contain primarily A‐type proanthocyanidins (PACs), which have been shown to prevent urinary tract infection. Currently, the accurate quantification of cranberry PACs is still lacking. Objective A normal‐phase high‐performance liquid chromatography (NP‐HPLC) method using relative response factors was developed and validated to quantify cranberry PAC oligomers and polymers. Materials and Methods PAC oligomers with degree of polymerisation (DP) 3–9 and total polymers were isolated from the cranberry juice concentrate. Characterisation of the isolated PAC oligomers was performed by ultra‐performance liquid chromatography‐high resolution mass spectrometry. The relative response factors of oligomers from DP 2–9 and total polymers were determined against procyanidin A2. Method validation was conducted to assess limit of detection, limit of quantification, the linearity and working range, precision and accuracy. In addition, quantifications of PACs by NP‐HPLC using relative response factors and two other commonly used methods were conducted in three cranberry food products. Results Cranberries PACs oligomers contained both A‐type and B‐type linkage, with epicatechin and epigallocatechin as basic units. Method validation results suggested this method is reliable and reproducible. Quantifications of PACs by NP‐HPLC using relative response factors yielded higher values than that by the other two methods. Conclusion A NP‐HPLC method using the relative response factors was developed and validated. This method provides a more accurate approach in determining cranberry PACs. It can be used to quantify individual oligomers from DP 2–9, total polymers and total PACs in cranberries and cranberry products.