4 research outputs found
Recommended from our members
Development and characterisation of protein films derived from dried distillers’ grains with solubles and in-process samples
Polymer films were developed utilising proteins extracted from wheat distillers’ dried grains with solubles (DDGS) and in-process samples (wet solids), both by-products of bioethanol production process. Structural characterisation of DDGS and wet solids films indicated a change in the secondary structure of the proteins, reflecting the impact of DDGS production process such as effect of enzyme on protein properties and consequently on the film properties; whereas the developed films exhibited a rough surface with voids. Determination of moisture sensitivity indicated that DDGS films exhibited more hydrophilicity than wet solids films, with the same trend being observed for their water solubility and water uptake. The moisture content and solubility of DDGS films ranged from 10.2-14.2 % and 32.3-41.8 % respectively whereas those for wet solids’ film ranged from 18.9-19.8 % and 23.8-24.2 % respectively. The mechanical properties of DDGS and wet solids (ranging from 0.27-0.32 MPa) were comparatively lower than commercial wheat gluten film (0.6 MPa). The poor mechanical properties and high water vapour permeability of DDGS and the wet solids films limit their application as biodegradable packaging materials. However, based on their hydrophilicity, the developed films have potential applications in agriculture and horticulture as controlled release matrices and soil conditioners
Recommended from our members
Extractability and characteristics of proteins deriving from wheat DDGS
Wheat Distillers’ Dried Grains with Solubles (DDGS) and in-process samples were used for protein extraction. Prolamins were the predominant protein components in the samples. The absence of extractable α- and γ-gliadins in DDGS indicated protein aggregation during the drum drying processing stage. Prolamin extraction was performed using 70% (v/v) ethanol or alkaline-ethanol solution in the presence of reducing agent. DDGS extracts had relatively low protein contents (14-44.9%, w/w), regardless of the condition applied. The wet solids were the most suitable raw material for protein extraction, with recovery yields of ~ 55% (w/w) and protein content of ~58% (w/w) in 70% (v/v) ethanol. Protein extracts from wet solids were significantly rich in glutamic acid and proline. Mass balance calculations demonstrated the high carbohydrate content (~ 50%, w/w) of solid residues. Overall, the feasibility of utilising in-process samples of DDGS for protein extraction with commercial potential was demonstrated
Recommended from our members
Changes in the arabinoxylan fraction of wheat grain during 1 alcohol production
Laboratory produced DDGS samples were compared with commercial samples from a distillery and a
biofuel plant. Changes in structure, solubility and content of arabinoxylan (AX) was determined. The
distillation process results in a relative increase of AX content compared to the starting material. The
heating and drying processes involved in the production of DDGS lead to an increased solubility and
viscosity of water-extractable AX. Production of DDGS results in structural changes to the AX. There
is a decrease in 2-and 3-linked arabinose oligosaccharides, that contributes to around a 50%
reduction in arabinosylation in DDGS compared with the starting grains. The current study shows
that laboratory-scale DDGS provide an accurate representation of the commercial scale and that the
AX composition of DDGS is consistently uniform irrespective of starting material. The uniformity of
DDGS and thin stillage makes them a good potential source of AX for production of prebiotics or
other novel products