ABSTRACT

  This project is the use of natural substances to wash vegetables and fruits that have chemical residues. which divided the experiment into 4 parts

(1) tested the plant species with leaching properties from pesticides by selecting 2 plants with Thunbergia laurifolia and Yanang. It was found that the extracts from tung chut leached methomyl and parathion better than extracts from Yanang leaves.

(2) was to test the characteristics of the extracts from the leaves of the Thunbergia laurifolia trumpets, namely, the fresh and dried leaves. It was found that the extract from the leaves of the old Rangoon leaves was better at leaching the methomyl and parathion substances than the extract from the leaves of the old Rangoon leaves.

(3) Test the optimum extraction temperature of the substance. By choosing to test at a temperature of 30 ℃ 60 ℃ 90 ℃ found that. The best qualified extraction temperature of dried trumpet leaves was 90℃. 

(4) examined the appropriate timing for the extraction of dried trumpet leaves prior to rinsing. by selecting the duration as 0 minutes (immediate extraction) 60 minutes and 120 minutes, it was found that the optimal extraction time was 60 minutes.

MEMBER

Mr. Noppadol Kampang

Mr. Kamonchat Chardsawad

Mr. Natsakorn Liangsorn