Eleven major phenolic compounds (hyperoside, isoquercitrin, chlorogenic acid, ideain, epicatechin, two procyanidin (PA) dimers, three PA trimers and a PA dimer-hexoside) were quantified in the fruits of 22 cultivars/origins of three species of the Chinese hawthorn (Crataegus spp.) by HPLC-ESI-MS-SIR. Hyperoside (0.1-0.8mg/g dry mass [DM]), isoquercitrin (0.1-0.3mg/g DM), chlorogenic acid (0.2-1.6mg/g DM), epicatechin (0.9-11.7mg/g DM), PA B2 (0.7-12.4mg/g DM), PA dimer II (0.1-1.5mg/g DM), PA trimer I (0.1-2.7mg/g DM), PA trimer II (0.7-6.9mg/g DM), PA trimer III (0.01-1.2mg/g DM) and a PA dimer-hexoside (trace-1.1mg/g DM) were detected in all the samples. Ideain (0.0-0.7mg/g DM) was found in all the samples except Crataegus scabrifolia. Significant correlations between the contents of individual PA aglycons were observed (r>0.9, P<0.01). A strong correlation between flavonols was also shown (r=0.71, P<0.01). Fruits of Crataegus pinnatifida var. major had higher contents of PAs but lower contents of flavonols compared with Crataegus brettschneideri. The fruits of C. scabrifolia contained the highest level of PA dimer-hexoside, which was present in trace amounts in the fruits of C. pinnatifida.
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