STUDY ON POTENTIAL USE OF GREEN COFFEE BEAN EXTRACT, SYNTHETIC NANO SILVER – GREEN COFFEE BEAN EXTRACT, BIOCHAR FROM DAK LAK ROBUSTA COFFEE WASTE

Abstract

Vietnam is a major coffee exporter in the world with an estimated annual output of more than one
million tons. From the production of green coffee, a large amount of defective green coffee beans are
discarded. The collection of these defective green coffee beans for medicinal purposes has made full
use of natural resources, bringing great value in both economy and environment. The study was carried
out with the following methods: Recovering of green coffee extract by impregnating in ethanol; Testing
for antimicrobial activity; Syntheticing nano silver - green coffee AgNPs-GCB. The results showed that
the high amount of extract obtained from discarded coffee beans reached 28.5-29.1%. Green coffee
extract (GCB) has chlorogenic acid (CGA) reaching 6.7%, caffeine 2.7% and could be used in
pharmaceutical chemicals and cosmetics. Green coffee extract, in addition to the known traditional
medicinal effects, is also a biologically active substance, reducing sugar, a stable emulsifying support
system in the production of nano-biomaterials to create nano-AgNPs-GCB for creating added value
from waste for coffee production