The Effect of Citric Acid on Physicochemical Properties of Hydrophilic Carboxymethyl Starch-Based Films

Wilpiszewska, Katarzyna; Antosik, Adrian Krzysztof; Zdanowicz, Magdalena

doi:10.1007/s10924-019-01436-9

Cited by 60 publications

(30 citation statements)

References 33 publications

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“…Chitosan is insoluble in deionized water at neutral pH, however starch, because of its hydrophilicity, may be partially soluble. The low gel content of starch hydrogel indicates that probably some amount of unreacted CA and its excess were present leading to CA‐modified starch acidolysis . It has been reported that the reduction of starch chains could occur at low pH .…”

Section: Resultsmentioning

confidence: 99%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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Citric acid (CA)-modified hydrogels from corn starch and chitosan were synthesized using a semidry condition. This strategy has great benefits of friendly environment because of the absence of organic solvents and compatible with the industrial process. The hydrogel blends were prepared with starch/chitosan ratios of 75/25, 50/50, and 25/75. The thermal stability, morphology, water absorption, weight loss in water, and methylene blue absorption were determined. Multi-carboxyl structure of CA could result in a chemical cross-linking reaction between starch, chitosan, and CA. The cross-linking reaction between free hydroxyl groups of starch, amino groups of chitosan, and carboxyl groups of CA has been confirmed by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analysis. The water absorption properties of CA-modified hydrogel blends were increased significantly compared with the native starch and chitosan. Moreover, the hydrogel blends modified with CA showed good water resistance and gel content. The morphology study confirmed the complete chemical cross-linking and porous structure of hydrogel blends. The hydrogel blend with the starch/chitosan ratio of 50/50 presented powerful absorption of methylene blue as well as chemical cross-linking reaction and dense structure. In sum, the hydrogel blend comprising 50% starch and 50% chitosan has the potential to be applied for water maintaining at large areas, for example, in agriculture. K E Y W O R D S chitosan, citric acid, crosslinking, hydrogel, starch 1 | INTRODUCTION Hydrogels are extremely hydrophilic polymer networks, either synthetic (petrochemical based) or natural (biopolymers), which are usually stabilized through covalent bonds or noncovalent interactions among the macromolecule chains known as cross-linking. 1-4 Hydrogels will swell when placed in water and can retain an extensive fraction of water within their spatial structures without dissolving. 5 A gel structure forms within the polymer melt after cross-linking. Currently, a wide range of natural polymer hydrogels such as starch, chitosan, collagen, and cellulose have been described as suitable biomaterials for pharmaceutical and biomedical applications because of their biocompatibility, low-toxicity, and biodegradability. 6-10Starch and its derivatives have attracted many researchers for expanding biopolymer industries since they are cost-effective, renewable, abundant in nature, and biodegradable. 11-14 However, some limitations exist in the properties of starch including poor mechanical properties, high hydrophilicity, fragility, and poor dimensional stability. [15][16][17][18][19] To improve the quality and also broaden the application areas of starch, these drawbacks need to be reduced significantly.Chitosan, isolated from chitin, is another polysaccharide that is abundant in nature and available in large quantities. Chitosan is biocompatible, biodegradable, biofunctional, and antimicrobial. [20][21][22] Mo...

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Section: Resultsmentioning

confidence: 99%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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“…318,324 It is also used for the development of different materials as biodegradable polymers whose properties including the mechanical ones have been investigated. [325][326][327][328][329][330][331][332][333][334][335][336][337][338][339][340][341] 2.4.1 Crystal structure. The optimized crystal structure of anhydrous citric acid, COOH-CH 2 -C(OH)(COOH)-CH 2 -COOH, is drawn in Fig.…”

Section: Anhydrous Citric Acidmentioning

confidence: 99%

Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Colmenero

2020

Mater. Adv.

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“…In‐situ crosslinking can increase mechanical strength by forming ester bonds between CA and citric acid. However, higher concentration of citric acid (15%) causes excess crosslinking and limited mobility of polymer chain which results in reduced tensile modulus of the fibers 53 …”

Section: Resultsmentioning

confidence: 99%

Morphology, mechanical, and physical properties of wet‐spun cellulose acetate fiber in different solvent‐coagulant systems and in‐situ crosslinked environment

Swapnil

Datta

Mahmud

et al. 2020

J of Applied Polymer Sci

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Wet spinning is a popular fiber manufacturing process where the effects of solvent and coagulant on the wet‐spun fiber are significant. In this study, we have explored the effect of solvent‐coagulant interaction and in‐situ crosslinking on the wet‐spun cellulose acetate (CA) fiber. Investigation on 12 different solvent‐coagulant systems revealed that variation in the systems resulted in significant variance in morphology and mechanical property of the fiber. Remarkable increase in mechanical property was observed after in‐situ crosslinking with citric acid and polyethylene glycol (PEG). Inclusion of sodium hypophosphite (NaH2PO2) as catalyst further increased tensile modulus (~407%) and crystallinity index (~46%) compared to CA fiber crosslinked with only citric acid. It was established that fiber from CA‐DMSO solution crosslinked with 10% citric acid and 10% PEG extruded in ethanol showed the highest tensile modulus (~30 MPa). This in‐depth study found an appropriate combination of solvent‐coagulant for forming stable CA fiber, with the addition of crosslinkers and catalyst further increasing the strength and usability of the fiber.

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The Effect of Citric Acid on Physicochemical Properties of Hydrophilic Carboxymethyl Starch-Based Films

Cited by 60 publications

References 33 publications

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Morphology, mechanical, and physical properties of wet‐spun cellulose acetate fiber in different solvent‐coagulant systems and in‐situ crosslinked environment

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