Синтез екзополісахариду етаполану на суміші меляси та соняшникової олії залежно від способу підготовки меляси

Abstract

У статті досліджено вплив способу підготовки меляси (обробка розчином сульфатної кислоти перед стерилізацією для розкладання сахарози домоносахаридів з подальшою нейтралізацією після гідролізу або без нейтралізації) на синтез екзополісахариду етаполану штамом Acinetobacter sp. ІМВВ-7005 на суміші цього субстрату та рафінованої (або змішаної відпрацьованої соняшникової олії). Концентрацію етаполану визначали ваговим методом після осадження ізопропанолом. Екзополісахарид-синтезувальну здатність розраховували як відношення концентрації полісахариду до концентрації біомаси.The influence of molasses preparation method (treatment with solution of sulfate acid before sterilization for decomposition of sucrose to monosaccharides, followed by neutralization after hydrolysis, or without neutralization) on exopolysaccharide ethapolan synthesis by Acinetobacter sp. ІМV В-7005 on this substrate and refined (or waste) sunflower oil mixture has been studied. The amount of synthesized ethapolan was determined gravimetrically after precipitation with isopropanol. The exopolysaccharide-synthesizing ability was calculated as the ratio of the exopolysaccharide concentration to the concentration of biomass. It has been esthablished, that using neutralized after sterilization molasses in mixture with refined oil was accompanied by increase in amount of synthesized exopolysaccharide in 1.15—1.25 times, compared to using simple hydrolyzed molasses. In the case of refined oil replacing in a mixture with molasses on a various batches of mixed waste oil (after frying potatoes, meat, vegetables and mixed, from “RockerPub”, Kyiv) the ethapolan synthesis rates did not differ from those on a mixture of molasses and refined substrate. The highest amount of synthesized polysaccharide (15.3—16.0 g/l) was observed at 3.0% concentration of neutralized molasses and mixed waste oil in mixture with using inoculum, which was grown on the corresponding oil. At the same time the highest exopolysaccharide-synthesizing ability (3.6 g exopolysaccharide/g biomass) was observed at lower (1.5%) monosubstrates concentrations in mixture and with using nonneutralized after hydrolysis molasses. The obtained results confirm the possibility of universal technology development for obtaining microbal exopolysaccharide ethapolan on a mixture of molasses and waste (fried) sunflower oil.