Production of Carboxymethyl Starches from Oxidized Starches and Determination of Their Tanning Characteristics

IF 0.6 4区工程技术 Q4 CHEMISTRY, APPLIED

Journal of The American Leather Chemists Association Pub Date : 2021-06-03 DOI:10.34314/jalca.v116i6.4311

Cigdem Ozkan, H. Ozgunay

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Abstract

Hydrogen peroxide and sodium metaperiodate oxidation of starch and their possible utilization in tanning/retanning were examined in our previous studies. In the present part, accordingly with our previous findings, hydrogen peroxide and sodium metaperiodate oxidation products having appropriate molecular weight/size were selected and additionally carboxymethylated. The yields of the processes (carboxymethyl starches) were characterized comprehensively and the effect of carboxymethylation process on structures and tanning abilities were tried to be identified. The characterization results revealed that the carboxymethyl groups were successfully included into the structure and the water solubility of oxidized starches (especially periodate oxidized ones) increased by carboxymethylation process. From the evaluation of the tanning results and considering its properties i.e. gentle tanning effect with less astringency and correspondingly a relatively soft leather handle and smooth grain, it is concluded that dialdehyde carboxymethyl starch (CMS 1:0.7) can be utilized as yet another good alternative sustainable green tanning/retanning agent from starch.

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氧化淀粉制备羧甲基淀粉及其鞣制特性的测定

我们在之前的研究中探讨了过氧化氢和偏碘酸钠对淀粉的氧化作用及其在鞣制/再鞣制中的应用。在本部分中，根据我们之前的发现，选择了具有适当分子量/大小的过氧化氢和偏碘酸钠氧化产物，并进行了羧甲基化。对羧甲基淀粉的收率进行了综合表征，并试图确定羧甲基化过程对其结构和鞣制性能的影响。表征结果表明，羧基甲基被成功地包含在结构中，羧基甲基化过程提高了氧化淀粉(特别是高碘酸盐氧化淀粉)的水溶性。通过对鞣制效果的评价，并考虑到其鞣制效果温和，涩味少，相应的革柄相对柔软，纹理光滑等特性，得出结论:双醛羧甲基淀粉(CMS 1:7 . 0)可以作为另一种良好的可持续绿色鞣制/复鞣剂。

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来源期刊

Journal of The American Leather Chemists Association 工程技术-材料科学：纺织

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

3 months

期刊介绍： The Journal of the American Leather Chemists Association publishes manuscripts on all aspects of leather science, engineering, technology, and economics, and will consider related subjects that address concerns of the industry. Examples: hide/skin quality or utilization, leather production methods/equipment, tanning materials/leather chemicals, new and improved leathers, collagen studies, leather by-products, impacts of changes in leather products industries, process efficiency, sustainability, regulatory, safety, environmental, tannery waste management and industry economics.