Synthesis and physicochemical properties of carboxymethyl chestnut starch

Abstract

Carboxymethyl chestnut starch (CMCS) was synthesized by the reaction of chestnut starch and monosodium chloroacetate in an alkali environment. The hydroxyl groups of starch were etherized through carboxymethyl groups, and the crystallinity of starch was reduced after carboxymethylation. As degree of substitution (DS) increased from 0.22 to 0.63, the degree of amyloglucosidase hydrolysis decreased from 37.0 to 1.6%, which was markedly lower than that of native chestnut starch (NCS) (83.2%). The differential scanning calorimetry results revealed the absence of a transition peak in all CMCS samples. CMCS paste showed significant higher light transmittance and freeze‐thaw stability than those of NCS, and had no water release during storage at room temperature. CMCS with middle DS showed higher viscosity than NCS at high shear rate. The results demonstrated that CMCS can be applied in the industrial processing of paste foods and frozen food as a thickening agent. Practical applications Carboxymethylated starch can be used as an alternative thickener in a wide range of industrial applications. However, there is little information on the synthesis and physicochemical properties of carboxymethylated chestnut starch till now. In the present study, the carboxymethylated chestnut starch was synthesized by the optimization of process, and the microstructure, light transmittance, and freeze‐thaw stability of starch were studied. We believe that starch industry can utilize the results of this study in the synthesis and application of this modified starch.

Esterification of carboxymethyl debranched waxy corn starch, its characterization and performances

“…Carboxymethyl starch belongs to an etherified starch. After the carboxymethylation, the modified starch shows a low tendency of retrogradation (recrystallization), strong water solubility, high clarity, high thermal stability, good acid and alkali resistance due to the introduction of hydrophilic groups (Spychaj, Wilpiszewska, & Zdanowicz, 2013;Kan, Zhao, Hu, Wu, & Ouyang, 2017). The esterification is often used for the modification of starch.…”

Optimization of Porous Phosphorylated Chestnut Starch Synthesis by Response Surface Methodology and Characterization of its Properties

“…[18] The structure and function of CS after dry heat treatment and addition of xanthan gum (XG) provided new insights into the interaction between CS, dry heat treatment and XG, and may contribute to the design of healthy CS-XG gels with low digestibility and glycemic index. [19] Although there are many reports on the use of CS in food and medical applications, [20][21][22][23][24] there are very few on its application as an adsorbent for wastewater treatment.…”

Preparation and Characterization of Amphiphilic Composites Made with Double‐Modified (Etherified and Esterified) Potato Starches

“…Carboxymethyl starch sodium (CMS) is a non-toxic, odorless white or yellow powder material and a cold water soluble anionic polymer compound which can be used to thicken, bond, retain water, protect colloids, as well as for electric welding, textile, printing and dyeing, paper making, daily chemical, petroleum, and other fields. [8] In practical applications, hydrophobic groups are introduced on the original basis to obtain amphiphilic starch for expanding the scope of applications and change the limitations of its single hydrophilicity in the development of foods and daily chemicals. At the same time, the introduction of hydrophobic groups can lead to aggregation owing to hydrophobic association, which is beneficial to improve its emulsifying properties and surface activity.…”