Atomic Force Microscopic Study of Morphological Changes for Treated and Untreated Collagen Fibers of Mongolian Goatskins
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Atomic Force Microscopic Study of Morphological Changes for Treated and Untreated Collagen Fibers of Mongolian Goatskins Enkhbaatar Ankhbayar1, Byamba Itgel2, Byambadembrel Batkhuu1, Dashnyam Urnaa3, and Chimed Ganzorig1 1
Center for Nanoscience and Nanotechnology and Department of Chemical Technology, School of Chemistry and Chemical Engineering, National University of Mongolia, Ulaanbaatar, Mongolia 2
School of Biological Resource and Management, Mongolian State University of Agriculture, Ulaanbaatar, Mongolia 3
Research and Experimental Center of the ARMONO, Ulaanbaatar, Mongolia
ABSTRACT In this study, the morphological changes of chemically treated (or preserved) with aqueous solutions of 1) a sodium chloride (NaCl) and 2) a compound containing sodium silicate, so called “wasserglass”, and untreated I-type collagen fibers of Mongolian goatskin are investigated by atomic force microscopy in ambient condition and at room temperature. The experimental results show that the difference between D period for both chemically treated and untreated collagen fibers are a relatively stable for morphological behavior. However, we find that the width of collagen fibers treated with the NaCl solution is more increasing with approximately 112 nm than those of samples (untreated and treated with wasserglass solution) for the range 93.4-94.8 nm. We also observe that a typically structure of the collagen fibers generally, a dense packing of the untreated and treated by wasserglass collagen fibers in bundles in a nearly parallel arrangement, with little changes in orientation can be seen. The collagen fibers treated by NaCl are a more destructive than untreated and treated by wasserglass for collagen fibers. INTRODUCTION Goatskin is one of the most important biomaterials in the natural resources for leather production. In order to keep the natural properties of the goatskin before the leather production, a treatment is needed for the tanning process using eco-friendly chemical compounds. The method of application of the preservatives including salts such as sodium chloride (NaCl) for hides and skins is a relatively simple, low cost and effective in the tanning process. However, in practical term such salt cannot be removed completely from a solution in the industrial effluent treatment. A European Community funded project to reduce the volume of solid tannery wastes by transferring them into by product has led to the Testing & Research Institute, Vienna, Austria, the LGR, Reutlingen, Germany, the SSIP, Naples, Italy, and tanneries from Austria, Germany, and Italy to develop procedures using aqueous solutions of alkali silicates, so called “wasserglass”, in beamhouse and tanning processing [1]. Wasserglass is a 50% aqueous solution of sodium silicate and sodium hydroxide and is a basic and inexpensive chemical that can be used in a number of applications [1]. The main
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advantage of using wasserglass seems to be that nearly all the shavings from the limiting processing can be utilized in other ways. Another advantage from
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