Oxyalkylation modification as a promising method for preparing low-melting-point agarose

Zhang, Na; Wang, Jianglin; Ye, Jing; Zhao, Peng; Xiao, Mingqing

doi:10.1016/j.ijbiomac.2018.05.171

Cited by 45 publications

(26 citation statements)

References 27 publications

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“…The storage modulus (G') and loss modulus (G") were obtained by the TRIOS software (v4.3.1, TA Instruments, New Castle, DE, USA) of TA Instruments. The gelling temperature and melting temperature values of gel could be confirmed by the crossover point of G' and G" curve during the heating and cooling processes [31]. The loss tangent was the ratio of G" to G', initial loss tangent (tanδ 0 ) was the loss tangent at the lowest temperature, and gelation rate was the change rate of G' with time [32,33].…”

Section: Rheological Measurementsmentioning

confidence: 89%

Effect of Gellan Gum and Xanthan Gum Synergistic Interactions and Plasticizers on Physical Properties of Plant-Based Enteric Polymer Films

Zhang

et al. 2020

Polymers

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The mechanical and barrier properties of plant-based enteric polymer films were enhanced by synergistic interactions between binary gum mixtures and adding plasticizers. The results indicated that the best ratio of gellan gum (GG) and xanthan gum (XG) was 7:3 by comparing tensile strength, tensile elongation, transmittance, and water vapor permeability of plant-based enteric polymer films and rheological properties of solutions. Polyethylene glycol 400 (PEG-400) was an effective plasticizer in improving plasticity and water vapor barrier property of the plant-based enteric polymer film. Rheology measurement and different characterization methods, including Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy, were used to explain interactions between GG and XG as well as PEG-400 and components of the film. The new mixed system, composed of GG/XG mixture with ratio of 7:3 as a novel gelling agent and PEG-400 as a plasticizer, was applied to prepare plant-based enteric hard capsules, which have potential applications in medicines and functional food preparations.

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Section: Rheological Measurementsmentioning

confidence: 89%

Effect of Gellan Gum and Xanthan Gum Synergistic Interactions and Plasticizers on Physical Properties of Plant-Based Enteric Polymer Films

Zhang

et al. 2020

Polymers

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“…It averages equal about three -CH 2 -groups. The closed results were obtained and for other heterogeneous catalysts [12,16].…”

Section: Resultsmentioning

confidence: 83%

Mercarbide Catalyst for Alcohol Ethoxylation

Butenko

Капустин

2020

Journal of Siberian Federal University. Chemistry

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Mercarbide catalyst was studied for the ethoxylation of methanol and 1-heptanol. Mercarbide catalyst is very active for the narrow-range ethoxylation of 1-heptanol. The narrow distribution of ethoxylation units in the ethoxylates is elucidated by the constrained reaction on the mercarbide catalyst. In the proposed surface reaction scheme, the following points are presented. The relatively basic reactants, ethylene oxide and alcohols or ethoxylates, are adsorbed on the relatively acidic sites of the surface. There is a decrease of ethoxylation rate in each additional ethylene oxide insertion step, due to a smaller number of the ethylene oxide molecules adsorbed near the growing point of alcohol ethoxylates. The difference in ethylene oxide insertion rates with the numbers of oxyethylene units in the ethoxylate products causes peaking of the distribution

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“…The weight of AHG was almost unchanged at 125–200 °C, and the weight decreased rapidly at 240–434 °C. This was mainly due to the single structure of the agarose chain [ 43 ]. For CAHG, the weight of the composite water was reduced after evaporation at 25–143 °C.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Agarose Fluorescent Hydrogel Inserted by POSS and Its Application for the Identification and Adsorption of Fe3+

et al. 2021

Gels

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After entering in water, Fe3+ is enriched in the human body and along the food chain, causing chronic poisoning and irreversible harm to human health. In order to solve this problem, we synthesized citric acid POSS (CAP) from aminopropyl POSS (OAP) and citric acid. Then, we synthesized fluorescent hydrogels (CAP-agarose hydrogel, CAHG) with CAP and agarose. The luminescence mechanism of CAP was investigated by theoretical calculation. CAP plays a dual role in composite hydrogels: one is to give the gels good fluorescence properties and detect Fe3+; the second is that the surface of CAP has a large content of carbonyl and amide groups, so it can coordinate with Fe3+ to enhance the adsorption properties of hydrogels. The experimental results show that the lowest Fe3+ concentration that CAHG can detect is 5 μmol/L, and the adsorption capacity for Fe3+ is about 26.75 mg/g. In a certain range, the fluorescence intensity of CAHG had an exponential relation with Fe3+ concentration, which is expected to be applied to fluorescence sensors. Even at a lower concentration, CAHG can effectively remove Fe3+ from the solution. The prepared fluorescent hydrogel has great potential in the field of fluorescent probes, fluorescent sensors, and ion adsorption. Besides, CAHG can be used as photothermal material after adsorbing Fe3+, allowing for material recycling and reducing material waste.

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Oxyalkylation modification as a promising method for preparing low-melting-point agarose

Cited by 45 publications

References 27 publications

Effect of Gellan Gum and Xanthan Gum Synergistic Interactions and Plasticizers on Physical Properties of Plant-Based Enteric Polymer Films

Effect of Gellan Gum and Xanthan Gum Synergistic Interactions and Plasticizers on Physical Properties of Plant-Based Enteric Polymer Films

Mercarbide Catalyst for Alcohol Ethoxylation

Preparation of Agarose Fluorescent Hydrogel Inserted by POSS and Its Application for the Identification and Adsorption of Fe3+

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