Effects of subcritical water extraction microenvironment on the structure and biological activities of polysaccharides from Lentinus edodes

Zhang, Jixian; Wen, Chaoting; Gu, Jinyan; Ji, Chenchen; Duan, Yuqing; Zhang, Haihui

doi:10.1016/j.ijbiomac.2018.11.194

Cited by 124 publications

(57 citation statements)

References 49 publications

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“…The average molecular weight of QPs obtained by gradient ethanol precipitation gradually decreased as the ethanol concentration increased ( Table 1 ). In addition, the polydispersity index (Mw/Mn) of five polysaccharides were less than 2, which means that molecules were less dispersed in the aqueous solution [ 16 ]. Furthermore, the polysaccharide molecules start to dehydrate when ethanol was added to a solution containing polysaccharide, and then polysaccharide conformation was transformed and assembled, due to the enhancement of intramolecular hydrogen bonding [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Properties, Antioxidant and Antidiabetic Activities of Polysaccharides from Quinoa (Chenopodium quinoa Willd.) Seeds

et al. 2020

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Quinoa is known for its rich nutrients and bioactive compounds. In order to elucidate the preliminary structural characteristics and biological activity of polysaccharides from quinoa (QPs), five crude polysaccharides (QPE50, QPE60, QPE70, QPE80 and QPE90) were successively fractionated by gradient ethanol, and their physicochemical properties, antioxidant and antidiabetic activities were analyzed. The results implied that their total sugar contents were 52.82%, 63.69%, 67.15%, 44.56%, and 41.01%, and their weight-average molecular weights were 13,785 Da, 6489 Da, 4732 Da, 3318 Da, and 1960 Da, respectively. Glucose was a predominantly monosaccharide in these QPs, which together in QPE50, QPE60, QPE70, QPE80, and QPE90, respectively, made up 94.37%, 87.92%, 92.21%, 100%, and 100% of the total polysaccharide. Congo red test showed that all five QPs contained triple-helix structure. The Fourier transform-infrared spectroscopy (FT-IR) and X-ray diffractometry (XRD) results suggest that the QPs form a semi-crystalline polymer constituted typical functional groups of polysaccharide including CO, CH and OH. The thermogravimetric analysis (TGA) of QPs showed that weight loss was at about 200 °C and 320 °C. The observation from scanning electron microscope (SEM) and atomic force microscope (AFM) image indicated that the morphology of QPs exhibited spherical shape. Antioxidant and antidiabetic assay exhibited that all five QPs samples had certain antioxidant and antidiabetic activities, and QPE90 showed the best antioxidant and antidiabetic activity. Overall, QPs present a promising natural source of food antioxidants and antidiabetic agents.

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Section: Resultsmentioning

confidence: 99%

Physicochemical Properties, Antioxidant and Antidiabetic Activities of Polysaccharides from Quinoa (Chenopodium quinoa Willd.) Seeds

et al. 2020

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“…In milder temperatures the hydrogen bonds are stronger and the dielectric constant (ε) is higher (Carr, Mammucari, & Foster, 2011). Under subcritical conditions, the hydrogen bonds rupture and the dielectric constant decreases (ε = 80 to 25 C for ε = 36 to 190 C), which makes the water close to those of organic solvents such as methanol (ε = 33 at 25 C) and ethanol (ε = 24 at 25 C) (Lu, Chen, Wang, Yang, & Qi, 2016;Teo, Tan, Yong, Hew, & Ong, 2010;Zhang et al, 2019). The solubility of water can be altered with increasing temperature, as the viscosity decreases, favoring solubility and increasing the rate of diffusion (Vladi c et al, 2017;Zakaria & Kamal, 2016).…”

Section: Data Analysesmentioning

confidence: 99%

Effect of subcritical water processing on the extraction of compounds, composition, and functional properties of asparagus by‐product

Iwassa

Ribeiro

Meurer

et al. 2019

J Food Process Engineering

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The aim of this study was to submit the asparagus by‐product to the subcritical water treatment, evaluating the extraction of antioxidants compounds (AC) and total reducing sugars (TRS), as well as, the composition and technological properties of the residual material. The effects of temperature (100–160 °C) and pressure (100–200 bar) on extraction were evaluated, for total extraction time of 120 min. The results showed that the increase in temperature favored the removal of AC and this variable did not cause modification of most of the compounds identified by mass spectra analysis. The highest removal of AC was observed up to 30 min. The increase in temperature decreased the TRS content. The pressure did not affect the extraction of sugars and AC in the conditions evaluated. The treatment was efficient for the modification of the physico‐chemical composition and technological properties of residual material, reducing the TRS content and improving the ratio of soluble fiber to insoluble fiber. Practical applications Asparagus by‐product can be an interesting source of nutrients, like dietary fiber and antioxidant compounds. To maximize the antioxidant yield obtained from this by‐product, it can be used the subcritical water extraction (SWE) that is considered a green solvent. Besides this, the SWE promotes the concentration of dietary fibers of the treated material, due to the sugars removal, and improves the functional properties, which can facilitate the utilization of this material in the development of new food products.

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“…The absorption bands at 1140 cm −1 and 1072 cm −1 indicated the existence of a pyranose configuration in JC-PS1 [23]. The absorption at 890 cm −1 indicated a β-configuration in JC-PS1 [24].…”

Section: Resultsmentioning

confidence: 99%

Structural Characterization and Anti-Proliferation Activities Against Tumor Cells of an Arabinogalactan from Juniperus convallium

Dong

et al. 2019

Molecules

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As a hyperproliferative disorder, cancer has continued to be a major public health challenge. In the present study, a polysaccharide JC-PS1 was isolated and purified from Juniperus convallium. JC-PS1 is a heteropolysaccharide composed of Ara, Gal, GalA and Rha with the average molecular weight of 280 kDa. Based on the methylation and 2D NMR analysis, JC-PS1 was elucidated as a backbone of →5)-α-Araf-(1→ and →3,5)-α-Araf-(1→, and three kinds of branches attached to the O-3 position of →3,5)-α-Araf-(1→, including β-GalpA-(1→3)-β-Galp-(1→, α-Araf-(1→3)-α-Rhap-(1→ and α-Araf-(1→3)-β-Galp-(1→. Accordingly, the atomic force microscopy of JC-PS1 showed a linear filamentous structure with small proportion of branches. Furthermore, JC-PS1 exhibited significant anti-proliferation activities against PANC-1, A431, MDA-MB-231, U118MG and H1975 cells with the IC50 values of 296.8, 477.9, 657.4, 686.7 and 862.1 μg/mL, respectively. This indicated that JC-PS1 could be a potential therapeutic agent for the treatment of cancer.

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Effects of subcritical water extraction microenvironment on the structure and biological activities of polysaccharides from Lentinus edodes

Cited by 124 publications

References 49 publications

Physicochemical Properties, Antioxidant and Antidiabetic Activities of Polysaccharides from Quinoa (Chenopodium quinoa Willd.) Seeds

Physicochemical Properties, Antioxidant and Antidiabetic Activities of Polysaccharides from Quinoa (Chenopodium quinoa Willd.) Seeds

Effect of subcritical water processing on the extraction of compounds, composition, and functional properties of asparagus by‐product

Structural Characterization and Anti-Proliferation Activities Against Tumor Cells of an Arabinogalactan from Juniperus convallium

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