Effects of acidity, number of hydroxyl group, and carbon chain length of carboxylic acids on starch cross-linking

Gebresas, Gerezgiher Alula; Szabó, Tamas; Marossy, Kálmán

doi:10.1016/j.crgsc.2022.100354

Cited by 6 publications

(4 citation statements)

References 48 publications

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“…The appearance of an additional peak at 1729 cm −1 confirms that the reaction between –OH of CMC and –COOH of SA has successfully taken place, forming an ester linkage. This finding is in accord with previous literature, where crosslinking of bio polysaccharides resulted in the formation of additional peaks due to C O stretching [ 42 , 43 ]. Both CMC-SA- β -CD and CMC-SA- β -CD/NCO exhibit similar peaks to those of CMC-SA except for some shifting and pattern of appearance of these peaks between 1800 and 1200 cm −1 .…”

Section: Resultssupporting

confidence: 93%

Artificial neural network modelling and experimental investigations of malachite green adsorption on novel carboxymethyl cellulose/β-cyclodextrin/nickel cobaltite composite

Sirach,

Dave

2024

Heliyon

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Section: Resultssupporting

confidence: 93%

Artificial neural network modelling and experimental investigations of malachite green adsorption on novel carboxymethyl cellulose/β-cyclodextrin/nickel cobaltite composite

Sirach,

Dave

2024

Heliyon

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“…Gebresas G.A. et al [34] have already described a similar morphology of films of polysaccharides cross-linked with succinic acid, where a relatively smooth granular structure is observed.…”

Section: Scanning Electron Microscopy Of the Arabinogalactan Filmsmentioning

confidence: 73%

“…Gebresas G.A. et al [34] have already described a similar morphology of films of polysaccharides cross-linked with succinic acid, where a relatively smooth granular structure is observed. As for the samples obtained by sublimation of the solvent, the output materials are reminiscent of a certain frame with many elongated channels (Figure 7).…”

Section: Scanning Electron Microscopy Of the Arabinogalactan Filmsmentioning

confidence: 73%

Preparation and Characterization of di- and Tricarboxylic Acids-Modified Arabinogalactan Plasticized Composite Films

et al. 2023

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To ensure the high quality of water, it is necessary to remove toxic pollutants. At present, purification of water is implemented using various sorbents. The efficient sorption materials are modified polysaccharides. In this study, we report on a new environmentally friendly method for modifying larch hemicellulose—arabinogalactan (AG)—with polybasic carboxylic acids (citric, succinic, oxalic, and adipic) to obtain composite materials. The synthesized AG derivatives have been explored by a complex of physicochemical methods, including gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), scanning electron microscopy (SEM), and sorption capacity investigations. It is shown that the heat treatment results in the formation of additional inter- and intramolecular bonds between carboxylic acids and polysaccharide molecules. The formation of ester bonds has been confirmed by the appearance of absorption bands in the IR spectra in the range of 1750–1690 cm−1. It has been found, using the TGA study, that the most thermally stable (up to 190 °C) sample is arabinogalactan oxalate obtained under heat treatment. The SEM study of the synthesized AG films has shown that the modified samples have the homogeneous film surface ensured by cross-linking. It has been established, when studying the sorption properties of the AG derivatives, that AG succinate (82.52%) obtained by lyophilization has the highest sorption capacity, due to the developed mesoporous surface, which, in turn, makes the synthesized films promising eco-friendly materials for use as drug carriers, sorbents, and water treatment agents.

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“…13,14 TPS chains are highly susceptible to crosslinked reaction with carboxylic acid as they readily contain highly reactive hydroxyl group to react with carboxyl group from carboxylic acid for esterification reaction. 15 Several research showed that the citric acid and tartaric acid could form crosslinked TPS films in acidic conditions. [16][17][18] Furthermore, the citric acid and tartaric also been recognized as safe material according to FDA and EFSA and thus, suitable for use in food packaging applications.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic starch hybrid biocomposite films with improved strength and flexibility produced through crosslinking via carboxylic acid

Lai

Osman

Adnan

et al. 2023

Journal of Thermoplastic Composite Materials

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Thermoplastic starch (TPS) suffers from its intrinsic low mechanical strength and high brittleness due to its strong hydrogen bonding and low chain mobility. The conventional way to crosslink the TPS film can improve the strength and stiffness of the films, but usually reduces the flexibility of the film, and increases its brittleness. In this study, the incorporation of the hybrid nanofiller [1 wt% nanocellulose (C) and 4 wt% nano bentonite (B)] into the TPS proved to improve greatly the films’ strength and flexibility. The hybrid nanofillers with ratio 4B:1C was incorporated into the crosslinked thermoplastic corn starch (CR-TPCS) film to increase the its flexibility and toughness and produced a high mechanical strength fully biodegradable film. Two different aqueous carboxylic acids: citric acid (CA) and tartaric acid (TA) with different pH values (2,4,6) as the green crosslinker were employed. Substantial increase of tensile strength (3.98 to 9.17 MPa), Young’s modulus (9.10 to 46.30 MPa) and elongation at break (55.2 to 135.7%) was observed for the CA- 4B1C/pH2 films compared to the CR-TPCS films. The melting temperature (Tm) of the CA-4B1C/pH2 improved compared to the TPCS/4B1C (un-crosslinked) film due to its crosslinking effect. Meanwhile, the CA-4B1C films exhibited the highest degree of substitution and di-esterification with the lowest swelling and water solubility properties due to the formation of a special “bridge” structure between the CA, nanocellulose and plasticizer. The “bridge” structure developed between the TPCS chains serves as the toughener to motivate higher chain stress relaxation and load endurance. The crosslinked “bridge structure” also proved to effectively reduce the retrogradation phenomenal in the TPCS films. This combination method of hybridization and crosslinking is an efficient, low cost, and environmentally friendly technique to overcome the low flexibility and brittleness problem of the TPS based packaging film.

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Effects of acidity, number of hydroxyl group, and carbon chain length of carboxylic acids on starch cross-linking

Cited by 6 publications

References 48 publications

Artificial neural network modelling and experimental investigations of malachite green adsorption on novel carboxymethyl cellulose/β-cyclodextrin/nickel cobaltite composite

Artificial neural network modelling and experimental investigations of malachite green adsorption on novel carboxymethyl cellulose/β-cyclodextrin/nickel cobaltite composite

Preparation and Characterization of di- and Tricarboxylic Acids-Modified Arabinogalactan Plasticized Composite Films

Thermoplastic starch hybrid biocomposite films with improved strength and flexibility produced through crosslinking via carboxylic acid

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