Application of low pentosan rye potable ethanol production

Abstract

The study demonstrates new applications of Yantarnaya winter rye bred in n. i. Vavilov Horticultural Institute to potable ethanol production. This variety of rye is particularly low in water-soluble pentosans (0.5–0.8%; comparable to the usual 0.5–1.0% pentosan content in wheat). The object of the study was Yantarnaya winter rye containing 0.53% pentosans, while the control material was forage rye with 3.60% pentosans. After the two rye samples were crushed by a dezi­15 disintegrator with 5-row rotors, sieve analysis of the grist showed 97±2% through for forage rye and 95±2% through for Yantarnaya. The grist was mixed with water at a 1∶3 ratio and infusion mashed without exogenous enzymes at 60°c for 2.5 hours during constant agitation. Throughout the process, mash samples were probed by a Visco Basic Plus viscosimeter fitted with the r2 spindle at a shear rate of 50 s⁻¹ and also had their extractivity uptake monitored. The cooked mashes were fermented with reactivated dry Thermosacc yeast (Lallemand), with supplemental nitrogen introduced as DistilaVitevm (Lallemand) additive, at 30°c for 62 hours. Quality criteria of distilled washes were assayed using a Kristall­2000m gas chromatograph, while the components of the ddg such as crude protein, fat, fibre, and ash were determined according to the applicable Russian standards. The experimental results demonstrate considerable applicability of Yantarnaya winter rye to potable ethanol production.