ĐÁNH GIÁ HÀM LƯỢNG TỔNG FLAVONOID TRÊN MỘT SỐ LOẠI RAU ĐƯỢC TRỒNG TẠI HAI ĐỊA BÀN ĐÀ NẴNG VÀ QUẢNG NAM

Abstract

Vegetables are an important component of the daily diet, being rich in nutrients and antioxidants, particularly flavonoids. The flavonoid content in vegetables can vary significantly depending on cultivation conditions, environmental factors, and processing methods. Currently, there is limited research specifically evaluating flavonoid levels in common vegetables from the regions of Da Nang and Quang Nam. Therefore, this study aims to assess the differences in flavonoid content among vegetables from these two regions and compare the findings with existing studies. Flavonoid content was determined using UV-Vis spectrophotometry at 420 nm after complexation with AlCl₃ in an acetate buffer (pH 3.4), with quantification based on quercetin as the standard. The vegetables studied include Centella asiatica Urb, Glebionis coronaria L., Plantago major L., and Houttuynia cordata Thunb., collected from four locations: Cam Le District and Hoa Vang District in Da Nang, and Hoi An City and Dai Loc District in Quang Nam. The results showed significant variation in flavonoid content among regions, influenced by cultivation conditions, vegetable species, and the methods of extraction and complexation. These findings provide a scientific basis for dietary recommendations, with potential applications in medicine and pharmaceuticals, as well as improvements in vegetable production and preservation techniques. The research will be further expanded to include more vegetable species in order to establish a flavonoid database for the Central Vietnam region.