Comparison of the Physicochemical and Interfacial Properties of the Polysaccharides from Notarchus leachii freeri Eggs
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Abstract:
The structural characteristics, physicochemical properties, and interfacial properties of the polysaccharide from Notarchus leachii freeri eggs (NLFE) were studied in this work. Polysaccharides from NLFE were prepared by cold water extraction and hot water extraction, respectively. The chemical composition analysis and phenol-sulfuric acid method were used to determine the chemical composition and content of the polysaccharide; the structure of polysaccharide was characterized by X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). Furthermore, the interfacial properties (including foaming properties and emulsifying properties) of the polysaccharides were studied by the traditional homogenization method. The results experimental showed that the extraction rate of the polysaccharide from NLFE treated by the hot water extraction was higher than that by the cold water extraction, with their extraction rates being 16.31% and 12.52%, respectively. Both extracts were semi-crystalline amorphous substances composed of polysaccharides and a small amount of protein with their polysaccharide contents up to 84.73 and 85.46%, respectively. With the increase of pH level, the foaming index of the polysaccharide extracted by the cold water gradually decreased (from 270% to 180%, which were still significantly higher than those for the hot water method), and their foam stability was 55.85% on average (which was lower than that for the hot water extraction method i.e. 92.47% on average). Compared with the emulsion stabilized by the polysaccharides extracted via cold water extraction, the emulsion stabilized by the polysaccharides obtained via hot water extraction had a smaller particle size under various conditions, thereby being more conducive to the formation of a stable emulsion. In summary, the polysaccharide obtained from NLFE demonstrates certain foaming ability and emulsion stabilizing ability. This study aims to offer a theoretical reference for the development and utilization of polysaccharides derived from NLFE.
