Utilizing Coffee Cherry Husk to Produce Greener Deep Eutectic Solvent-Based Active Compound Extract Kanchana Watla-iad*, Thitipone Suwunwong, Patcharanan Choto
1) School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand- 2) Center of Chemical Innovation for Sustainability, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand- 3) Coffee Quality Research group, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
*kanchana.wat[at]mfu.ac.th
Abstract
Coffee production produces a huge amount of waste including coffee cherry husks (CCHs). However, it was previously reported that bioactive compounds are significantly present in CCHs. The extracts of active compounds from CCHs are interesting. Deep Eutectic Solvents (DESs) are an alternative solvent for green extraction due to non-toxicity and biodegradability. This work studied the optimal extraction of active compounds from CCHs using DES composed of choline chloride (ChCl) and citric acid monohydrate (CA). DES was prepared by heating ChCl and CA with a 1 to 2 molar ratio, at 80 degrees Celsius until it became homogeneous. The obtained homogeneous mixture was quite vicious. Thus, the percentage of water additions varied from 20-50 was studied. The extraction process used ultrasound waves at room temperature (30 degrees Celsius) for 60 min. The extraction efficiency was determined in terms of total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activity (AA) presented in the crude extracts. It was found that the DES with 40 percent by weight water addition is the optimum condition for extraction. The levels of TPC, TFC, and AA measured from this condition were reported. The active compounds from CCHs extracted by DES could be developed for value-added products such as supplementary food and cosmetics.
Keywords: Utilizing, Coffee Cherry Husk, Deep Eutectic Solvent, Active Compound Extract
Topic: Coffee agroforestry, science and technology
