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      Structural Characteristics, Rheological Properties, and Antioxidant Activity of Novel Polysaccharides from “Deer Tripe Mushroom”

      1 , 2 , 1 , 3 , 1 , 4 , 1 , 2 , 1 , 1 , 4
      Journal of Food Quality
      Hindawi Limited

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          Abstract

          The polysaccharide was extracted by water extraction and alcohol precipitation method from “deer tripe mushroom,” which was domesticated and bred from wild Auricularia delicata in Zambia. The structure of the deer tripe mushroom polysaccharide (DTMP) was characterized by gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), scanning electron microscope (SEM), and other analytical techniques. And the rheological and gel properties and antioxidant capacities of the polysaccharide were studied. The results showed that DTMP was mainly composed of mannose, fructose, glucose, and galacturonic acid, of which the galacturonic acid was the main component. By calculation, the molar ratio of mannose : fructose : glucose : galactoacid in DTMP is 0.8 : 14.8 : 1.0 : 26.32. The polysaccharide was mainly composed by α-1,4-glycosidic bond. DTMP solution showed a shear-thinning (pseudoplastic) behaviour, and its pseudoplasticity was more obvious at a concentration of 2%. The power law model was used to evaluate the viscosity curves of DTMP, and its viscosity and consistency indices both increased as the concentration increased, whereas both indices decreased as the concentration decreased. The viscosity of the polysaccharide solution changed as the pH changed: the polysaccharide solutions had a higher viscosity at pH = 10. DTMP showed gel-like behaviour (G′ > G″), and the gel strength enhanced with the increase of concentration (2%–10%). In addition, the antioxidant experiment of DTMP showed that it had good antioxidant activity, and there was a significant dose-effect relationship between its activity and concentration in the low concentration range.

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          Some methodological problems in the determination of antioxidant activity using chromogen radicals: a practical case

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            Antioxidant Activity and Total phenolic content of Essential Oils and Extracts of Sweet Basil (Ocimum basilicum L.) plants

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              Comparison of different extraction methods for polysaccharides from Dendrobium officinale stem

              The purpose of this study was to screen the optimum extraction of polysaccharides (DOP) from Dendrobium officinale stem. Firstly, different methods, including hot water extraction (HWE), cold-pressing (CP), freeze-thawing cold-pressing (FTCP), ultrasonic-assisted hot water extraction (UHWE), microwave-assisted hot water extraction (MHWE) and enzyme-assisted hot water extraction (EHWE), were employed to extract DOP under their respective best parameters. Then, the extraction yield, structure and antioxidant activity of the polysaccharides from different extraction methods were compared under the same condition. The data implied that UHWE and FTCP possessed higher extraction yield than the other extraction methods. Besides, DOPCP and DOPFTCP had higher molecular weight than the other polysaccharide samples. More importantly, DOPFTCP had the highest antioxidant activity. Overall, DOPFTCP exhibit high extraction yield, well-preserved molecular chains and best antioxidant activity, all these indicated FTCP was the most suitable method to extract DOP.
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                Author and article information

                Contributors
                Journal
                Journal of Food Quality
                Journal of Food Quality
                Hindawi Limited
                1745-4557
                0146-9428
                October 15 2021
                October 15 2021
                : 2021
                : 1-12
                Affiliations
                [1 ]School of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
                [2 ]Scientific Research Base of Edible Mushroom Processing Technology Integration of Ministry of Agriculture and Rural Affairs, Changchun 130118, China
                [3 ]Key Laboratory of Technological Innovations for Grain Deep-Processing and High-Effeciency Utilization of By-Products of Jilin Province, Changchun 130118, China
                [4 ]Engineering Research Center of Grain Deep-Processing and High-Effeciency Utilization of Jilin Province, Changchun 130118, China
                Article
                10.1155/2021/6593293
                2db981cc-ff7b-4340-bb9d-0434261783fa
                © 2021

                https://creativecommons.org/licenses/by/4.0/

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