Synthesis of Carboxymethyl Starch with High Degree of Substitution by a Modified Dry Process

Li, Sifang; Mujyambere, Jean Marie Vianney; Liu, Miao

doi:10.4028/www.scientific.net/amr.233-235.306

Cited by 12 publications

(18 citation statements)

References 13 publications

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“…CMS aqueous solutions are non‐Newtonian liquids 28. Generally, higher substituted CMS gave aqueous solutions of higher viscosities than low substituted derivatives 11. This is possibly caused by higher density of negatively charged carboxymethyl groups and therefore greater electrostatic repulsion between high DS polysaccharide chains, molecules tended to exist in a more expanded state, resulting in higher viscosity value 4.…”

Section: Methods Of Structure and Physicochemical Properties Of Cms Dmentioning

confidence: 99%

“…However, addition of small amounts of alcohols (ethanol, isopropanol) allowed to obtain CMS with DS up to ca. 0.7–0.8 11, 12.…”

Section: Synthesis Of Carboxymethyl Starchmentioning

confidence: 99%

“…Recently, Li et al 11 have obtained CMS with DS up to 0.8 with RE of 39%; carboxymethylation of potato starch was carried out in an electric blender. First, starch (15 wt% of water) and solid NaOH were added and mixed together to form an uniform powder mixture.…”

Section: Synthesis Of Carboxymethyl Starchmentioning

confidence: 99%

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Medium and high substituted carboxymethyl starch: Synthesis, characterization and application

2012

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Carboxymethyl starch (CMS) could find application in many areas of industry. A review of synthesis methods of medium and high substituted CMS was presented. The influence of synthesis parameters on degree of substitution (DS) as well as reaction efficiency was described. The methodology of CMS physicochemical properties determination as well as the relation between CMS chemical characteristics (e.g. DS, amylose/amylopectin ratio) and its physicochemical properties was presented. Moreover, reported CMS applications were submitted.

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Section: Methods Of Structure and Physicochemical Properties Of Cms Dmentioning

confidence: 99%

“…However, addition of small amounts of alcohols (ethanol, isopropanol) allowed to obtain CMS with DS up to ca. 0.7–0.8 11, 12.…”

Section: Synthesis Of Carboxymethyl Starchmentioning

confidence: 99%

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Medium and high substituted carboxymethyl starch: Synthesis, characterization and application

2012

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“…47 Highly substituted CMPS has higher viscosity than the low substituted one. 48 The electrostatic effect between polysaccharide chains with a high DS increases the viscosity by further widening the molecules. 47 It is also known that the viscosity of the polysaccharides depends on the molecular weight.…”

Section: Viscosity Of Cmps Aqueous Solutionsmentioning

confidence: 99%

Synthesis, Characterization and Application of Carboxymethyl Potato Starch Obtained From Waste

Akarsu¹,

Dolaz²

2019

Cellulose Chem. Technol.

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Waste potato starch (WPS) was obtained from the food industry during slicing, peeling and washing potatoes in the process of producing potato chips. After it was purified with H 2 O 2 and NaOH at the desired temperature, carboxymethyl potato starch (CMPS), with the DS in the range from 0.04 to 1.24, was synthesized in isopropanol (IPA) and NaOH solution by adding monochloroacetic acid (MCA). Considering all the studied conditions, the best results were achieved when IPA was used as solvent at 45 °C for 180 min and at a NaOH/MCA molar ratio of 2.2:1. CMPS-2, obtained under these conditions, reached a viscosity of 14200 mPa. s (for 2% CMPS in water at 1 rpm) for the highest DS. The samples were investigated by determining their DS and by SEM, FTIR, XRD, NMR and thermal analyses. Moreover, the viscosity of the CMPS aqueous solutions was measured. 100% cotton yarns with different numbers (10/1, 20/1 and 30/1 Ne) were sized with CMPS-29, CMPS-27, CMPS-25 and CMPS-22, and then their tensile strength and elongation at break were measured. The tensile strength of the sized samples increased by 87.65%, compared with that sized with WPS. Also, CMPS with DS 0.04 exhibited considerably better sizing properties, compared to WPS.

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“…Carboxymethyl starch (CMS) is a kind of water‐soluble anionic etherified starch, and can be obtained by the etherification reaction of starch with chloroacetic acid in alkaline conditions . The introduced carboxyl group can provide starch with good solubility in water and improved mechanical properties by ways of increasing hydrophilicity of starch molecules and decreasing its structural regularity.…”

Section: Introductionmentioning

confidence: 99%

High‐Efficient Preparation of Carboxymethyl Starch via Ball Milling With Limited Solvent Content

et al. 2018

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Carboxymethyl starch (CMS) is successfully prepared via ball milling in the presence of limited amounts of solvent, monochloro acetate, or dichloroacetic acid. In the process, several factors affecting carboxymethylation reaction such as solvent, NaOH/ClCH2COONa ratio, ClCH2COONa/anhydroglucose unit (AGU) ratio, reaction time, and amount of dichloroacetic acid are investigated in terms of the degree of substitution (DS) for the CMS and the optimum conditions are established. Under this condition, the substitution degree of the prepared CMS is 0.65 and the reaction efficiency can reach up to 80%. Additionally, crosslinked carboxymethyl starch is prepared by using dichloroacetic acid as crosslinking agent in the same condition in order to increase the viscosity of CMS. The crystallinity of CMS is measured by X‐ray diffraction. And the results shows that the crystallinity of the product is decreased with the increasing milling time and substitution degree. FTIR and 1HNMR spectra indicates that the hydroxyl groups of starches are substituted by carboxymethyl groups. Our work provides a simple method for high‐efficient preparation of CMS via ball milling in the presence of monochloro acetate and dichloroacetic acid and has great potential for broadening the application of starch.

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Synthesis of Carboxymethyl Starch with High Degree of Substitution by a Modified Dry Process

Cited by 12 publications

References 13 publications

Medium and high substituted carboxymethyl starch: Synthesis, characterization and application

Medium and high substituted carboxymethyl starch: Synthesis, characterization and application

Synthesis, Characterization and Application of Carboxymethyl Potato Starch Obtained From Waste

High‐Efficient Preparation of Carboxymethyl Starch via Ball Milling With Limited Solvent Content

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