PHYTOCHEMICAL SCREENING AND SPECTROPHOTOMETRIC DETERMINATION OF TOTAL POLYPHENOLS IN POTATOES
Клучни зборови:
potatoes, Solanum tuberosum L., total phenolic content (TPC), phytochemical screening.Апстракт
Potato (Solanum tuberosum L.) is an important food crop recognized not only for its nutritional value but also for its content of bioactive compounds with potential health benefits. This study aimed to evaluate the phytochemical composition and total polyphenolic content (TPC) in potato core and peel extracts. Samples were subjected to drying, followed by ultrasonic extraction using 80% methanol. Qualitative phytochemical screening was performed to identify major classes of bioactive compounds, while TPC was determined using the Folin-Ciocâlteu method. The results revealed variability in phytochemical composition depending on the sample type and drying conditions. Terpenoids, saponins, tannins, and glycosides were detected in most samples, while flavonoids and phenolic compounds were not identified using qualitative assays, likely due to low concentrations or degradation during processing. A strong linear relationship was obtained for the calibration curve (R² = 0.9994), confirming the reliability of the method. Quantitative analysis showed significantly higher TPC in potato peel (1.67 mg GAE/100 g) compared to the core (1.02 mg GAE/100 g), highlighting the peel as a richer source of phenolic compounds. These findings emphasize the potential of potato by-products as valuable sources of natural antioxidants for applications in functional foods and sustainable food systems.
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