Oxidized gum arabic cross-linked pectin/O-carboxymethyl chitosan: An antibiotic adsorbent hydrogel

Darvishi, Reza; Moghadas, Hajar; Moshkriz, Ali

doi:10.1007/s11814-021-1038-3

Cited by 12 publications

(2 citation statements)

References 32 publications

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“…23,29,39 The amount of aldehyde formed in the product was quantified using hydroxylamine hydrochloride, 3,37,38,[40][41][42] hydroxyl ammonium chloride, 43,44 and 2,4-dinitrophenylhydrazine 23,36,45 titrations, or a TNBS assay. 46 Removal of the iodate by-product is usually achieved by dialysis, 3,22,23,28,29,35,38,39,[41][42][43][44][45][46][47][48] or precipitation in ethanol 37 or acetone 36 and washing with water.…”

Section: Introductionmentioning

confidence: 99%

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

et al. 2023

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“…22,28 The amount of aldehyde formed in the product was quantified using hydroxylamine hydrochloride 3,[35][36][37][38] and 2,4-dinitrophenylhydrazine 22,34 titrations, or a TNBS assay. 39 Removal of the iodate by-product is usually achieved by dialysis, 3,21,22,27,28,33,36,[38][39][40][41] or precipitation in ethanol 35 or acetone 34 and washing with water.…”

Section: Introductionmentioning

confidence: 99%

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

Siebe

Sardjan

Massmann

et al. 2022

Preprint

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Renewable polysaccharide feedstocks are of interest in bio-based food packaging, coatings and hydrogels. Their physical properties often need to be tuned by chemical modification, e.g. by oxidation using periodate, to introduce carboxylic acid, ketone or aldehyde functional groups. The reproducibility required for application on an industrial scale, however, is challenged by uncertainty about the composition of product mixtures obtained and of the precise structural changes that the reaction with periodate induces. Here, we show that despite the structural diversity of gum arabic, primarily rhamnose and arabinose subunits undergo oxidation, whereas (inchain) galacturonic acids are unreactive towards periodate. Using model sugars, we show that periodate preferentially oxidises the anti 1,2-diols in the rhamnopyranoside monosaccharides present as terminal groups in the biopolymer. While formally oxidation of vicinal diols results in the formation of two aldehyde groups, only traces of aldehydes are observed in solution, with the main final products obtained being substituted dioxanes, both in solution and in the solid state. The substituted dioxanes form most likely by the intramolecular reaction of one aldehyde with a nearby hydroxyl group, followed by hydration of the remaining aldehyde to form a geminal diol. The absence of significant amounts of aldehyde functional groups in the modified polymer impacts crosslinking strategies currently attempted in the preparation of renewable polysaccharide-based materials.

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Carboxymethyl chitosan/alginate/polyethylene glycol composite hydrogel for nucleic acid lysis solution storage at the point of care

Tang,

Yan,

et al. 2024

Cellulose

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Oxidized gum arabic cross-linked pectin/O-carboxymethyl chitosan: An antibiotic adsorbent hydrogel

Cited by 12 publications

References 32 publications

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

Formation of substituted dioxanes in the oxidation of gum arabic with periodate

Carboxymethyl chitosan/alginate/polyethylene glycol composite hydrogel for nucleic acid lysis solution storage at the point of care

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