Fluorescent Tracing of Dialdehyde Sodium Alginate Tanning Agent in Leather Matrix

IF 0.6 4区 工程技术 Q4 CHEMISTRY, APPLIED Journal of The American Leather Chemists Association Pub Date : 2023-09-01 DOI:10.34314/jalca.v118i9.8189
Min Zhu, Yudan Yi, Jia Fu, Yunhang Zeng, Ya-nan Wang
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Abstract

Dialdehyde polysaccharides possess a sustainable nature and good tanning performance. However, the lack of specific detectable groups in their molecular structure results in the difficulty in the determination of the location of dialdehyde polysaccharides in leather fiber networks. In this study, dialdehyde sodium alginate (DSA) tanning agent was fluorescent labeled by 5-(4,6-dichlorotriazinyl) aminofluorescein (DTAF). The purified DTAF–DSA showed high and stable fluorescent intensity at emission wavelength of 515.2 nm when the pH was over 6.0, and the temperature was in the range of 20°C to 50°C. DTAF–DSA was used in tanning and tracked using fluorescence microscopy. Its penetration in the fiber network could be clearly visualized, and its distribution in leather differed with the molecular weight of DSA. As a result, this fluorescence tracing technique could display the mass transfer behavior of dialdehyde polysaccharide tanning agents in leather matrix, which will provide underlying data for tanning mechanism exploration.
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荧光追踪皮革基质中的海藻酸钠二醛鞣剂
二醛多糖具有可持续性和良好的鞣制性能。然而,由于其分子结构中缺乏特定的可检测基团,因此很难确定二醛多糖在皮革纤维网中的位置。在这项研究中,用 5-(4,6-二氯三嗪基)氨基荧光素(DTAF)对二醛海藻酸钠(DSA)鞣剂进行了荧光标记。纯化后的 DTAF-DSA 在 pH 值超过 6.0,温度在 20°C 至 50°C 之间时,在 515.2 nm 的发射波长处显示出较高且稳定的荧光强度。DTAF-DSA 被用于鞣制,并利用荧光显微镜进行跟踪。它在纤维网络中的渗透情况清晰可见,其在皮革中的分布随 DSA 的分子量而不同。因此,这种荧光追踪技术可以显示二醛多糖鞣剂在皮革基质中的传质行为,为探索鞣制机理提供基础数据。
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来源期刊
Journal of The American Leather Chemists Association
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
29
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.
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