Polyphenolic content and antimutagenicity of the methanol extracts prepared from 22 cultivars of sweet potato with different flesh colors were investigated using Folin-Ciocalteu's phenol reagent method and Ames test, respectively. There was a remarkable cultivar difference in the polyphenolic content of sweet potato. Su, Hayanmi and Shinhwangmi among 17 cultivars of non-purple sweet potato had higher polyphenolic contents of 21.4, 21.5 and 20.3 μg (GAE/g dried sweet potato), respectively, whereas Manami and Yeonhwangmi were very much lower at 4.6 and 4.8 μg. Mokpo No.62, Borami, Sinjami, Jami and Ayamurasaki had much higher polyphenolic contents of 67.7, 76.9, 44.9, 128.3 and 93.2 μg, respectively, than non-purple sweet potato. The methanol extract from the sweet potato effectively inhibited the reverse mutation induced by 1-NP, daunomycin, Trp-P-1, Trp-P-2 and 2-AA on S. Typhimurium TA 98, and by 1-NP on S. Typhimurium TA 100. These results suggest that the antimutagencity properties may be influenced by the tested mutagen and strain rather than the polyphenolic content of non-purple and purple sweet potato. However, in the purple sweet potatoes, a high polyphenolic content may influence the antimutagencity properties.
A high resolution LC-ESI-QTOF-MS, LC-MS/MS, and HPLC-DAD analysis were conducted to isolate, identify and quantify the chlorogenic acids in 17 sweet potato varieties cultivated in Korea. The impacts of extracting solvent mixture system on the quantity and composition chlorogenic acids of the extracts were studied. It was found that extracting solvent mixture system greatly affected the quantity and quality of chlorogenic acids in the extracts of sweet potato. The optimum extracting solvent system was selected for extracting the chlorogenic acids from sweet potatoes. The profiles and quantities of chlorogenic acids in sweet potatoes were greatly different with variety, showing about 30-fold variation in quantity. Juhwangmi contained the highest quantity of chlorogenic acid (2393.65 μg/g dry weight), while Matnami contained the least quantity of chlorogenic acid (68.62 μg/g dry weight). High correlations (>0.97) were observed between chlorogenic acid contents and antioxidant potential data from DPPH, ABTS, FARP, and total phenolic assays. Sweet potatoes were statistically classified in 4 well defined groups in terms of their similarity in chlorogenic acid profile and quantity. This represents the first report on the profiles and quantity of chlorogenic acids as well as antioxidative potentials of several unreported sweet potato varieties.
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