Fractional Isolation and Structural Characterization of Hemicelluloses from Soybean Hull

Abstract

Hemicellulosic fractions were extracted from soybean hull with various concentrations of NaOH at 50 °C for 5 h. The chemical compositions and physicochemical properties were determined by high performance anion exchange chromatography (HPAEC), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and 13 C and 2D nuclear magnetic resonance (NMR) analysis. The crystallinity of soybean hulls treated and untreated by alkali liquid was examined by X-ray diffraction (XRD). The sugar analysis results indicated that all of the hemicellulosic preparations were heteropolysaccharides containing arabinose, galactose, glucose, xylose, and mannose. According to the spectral analysis, hemicelluloses from soybean hull were assumed to be L-arabino-4-O-methyl-D-glucurono-D-xylan. Xylose was the predominant monosaccharide in the hemicellulose fraction 1 (H1), and it ranged between 40.1% and 48.8% of the total neutral sugars. It was found that hemicellulose fraction 3 (H3) had the highest thermal stability and H1 had the lowest thermal stability. The crystallinity index (CrI) was found to be about 20.8%, 14.3%, 10.9%, and 4.7% for soybean hulls, untreated and treated with 1.5, 2.0, and 2.5 M NaOH, respectively.

Nanofibers from soybean hull insoluble polysaccharides as Pickering stabilizers in oil‐in‐water emulsions formulated under acidic conditions

“…As expected, the major monomer was glucose indicating that cellulose is the predominant polysaccharide in HIPS ch‐1000 . Minor amounts of xylose and mannose would correspond to soybean hull hemicelluloses monosaccharides 22 . Galactose, rhamnose, fucose and arabinose were not detected in HIPS ch‐1000 .…”

“…Minor amounts of xylose and mannose would correspond to soybean hull hemicelluloses monosaccharides. 22 Galactose, rhamnose, fucose and arabinose were not detected in HIPS ch-1000 . Also, proteins were not detected in HIPS ch-1000 .…”

Composition, morphology, interfacial rheology and emulsifying ability of soy hull polysaccharides extracted with ammonium oxalate and sodium citrate as extractants

“…Soy hull is carbohydrate‐based and has high cellulose (28.6–52.3%) and hemicellulose contents (18.5–33.8%). There is also the presence of pectin (4.2%) and protein (9.4%) 1,2 . It has been confirmed that soy hull polysaccharide (SHP) has excellent biological activity and a new type of natural dietary fiber energy 3 .…”

“…There is also the presence of pectin (4.2%) and protein (9.4%). 1,2 It has been confirmed that soy hull polysaccharide (SHP) has excellent biological activity and a new type of natural dietary fiber energy. 3 Recently, Han et al 4 indicated that SHP has the potential to be developed as a new functional food contributing to the alleviation of liver damage.…”