{'fraction_non_alphanumeric': 0.06370875995449374, 'fraction_numerical': 0.04323094425483504, 'mean_word_length': 4.641025641025641, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Separation and purification of four tannins from Potentilla parvifolia Fisch. (Rosaceae) using high-speed counter-current chromatography

ABSTRACT Four tannins were isolated and identified from Potentilla parvifolia using high-speed counter-current chromatography (HSCCC) in this study. A two-phase solvent system composed of n-hexane-ethyl acetate-methanol-water (1:11:1.2:11, v/v/v/v) was chosen and yielded 18.8 mg of procyanidin B3, 9.8 mg of procyanidin B6, 9.1 mg of procyanidin B7, and 6.9 mg of 2,3,4,6-tetra-O-galloyl-D-glucose, all at over 95% purity, from 120 mg of the crude sample powder. The identifications were performed with 1H NMR and 13C NMR. This is the first report showing the presence of procyanidin B7 and 2,3,4,6-tetra-O-galloyl-D-glucose in the genus Potentilla, and procyanidin B3 and procyanidin B6 were isolated from P. parvifolia for the first time.