Production of ethanol and polyethanol by yeasts isolated from date (Phoenix dactylifera L.) wastes

Abstract

The production of dates (Phoenix dactylifera L.) in Algeria generates each year, considerable quantities of waste that weaken the balance of our environment and are very rich in organic matter. Their valuation by biotechnological processes enables the production of high value added materials with low cost. In this regard, the objective of this study focused on the selection of yeasts that can be used to produce ethyl alcohol from this waste used in many industries and phenylethanol, an aroma popular in food, cosmetic and pharmaceutical. Among the three selected yeasts, RAM.20 generated up to 8 g/L of ethanol and excess of 800 mg/L of phenylethanol, and three sugars found in dates of the waste, namely glucose, fructose and sucrose. It is distinguished by its resistance to 18% ethanol (v/v) and 3 g/L phenylethanol. This strain naturally tolerates these products and is easy to handle and has a fundamental economic interest.

Keywords: Yeasts, dates, waste, value, resistance, ethanol, phenylethanol