Candas Adiguzel Zengin | Ege University (original) (raw)

Papers by Candas Adiguzel Zengin

WOS: 000322802600010The effect of Quillaja saponaria saponin, a plant-derived biosurfactant, as a... more WOS: 000322802600010The effect of Quillaja saponaria saponin, a plant-derived biosurfactant, as an antimicrobial soaking agent in leather manufacturing was investigated in terms of microbial load, total protein content and chemical oxygen demand of residual floats. The antimicrobial activities of three different commercially available saponins (Saponin A, R and S) were tested by using different concentrations of sapogenin (0.125-1g) in soaking process. The concentration of 0.125g Saponin S and 0.25g Saponin R showed the highest similarity to Biocide 1 and 2 for 8h of soaking process respectively. Comparable results to synthetic biocides were obtained from 1g sapogenin treatments of Saponin A and R applications after 24h of soaking process. The total protein content of soaking liquor was increased at higher sapogenin contents in spite of decreased microbial growth which was a well indication of antimicrobial soaking character of saponins. The results showed that Quillaja saponins hav...

Anilin, pigment ve rugan finisaj tipleri yuzluk derilerin uretiminde kullanilan en yaygin finisaj... more Anilin, pigment ve rugan finisaj tipleri yuzluk derilerin uretiminde kullanilan en yaygin finisaj teknikleridir. Yuzluk derilere uygulanan farkli finisaj tipleri, derilerin fiziksel, fonksiyonel ozelliklerine ilaveten konfor ve gorunum ozelliklerini etkilemektedir. Yuzluk derilerin fiziksel karakterizasyonu uzerine farkli finisaj turlerinin etkisini degerlendirmek icin bu calismada dana ve keci derileri kullanilmistir. Anilin, pigment ve rugan finisaj islemi gormus mamul derilerin su buhari gecirgenligi, hava gecirgenligi ve isil direnc testleri yuzluk derilerin konfor ozelliklerinin belirlenmesi icin finisaj islemi oncesi ve sonrasi gerceklestirilmistir. Morfolojik karakterizasyon icin masaustu taramali elektron mikroskobu (TSEM) kullanilmistir. Su buhari ve hava gecirgenligi degerleri finisaj islemi oncesi onemli olcude yuksek bulunmasina ragmen finisaj islemleri sonrasi daha dusuk sonuclar elde edilmistir. Sadece su buhari gecirgenligi istatistiksel olarak etkili bulunurke...

The main causes of leather goods damage is fading as well as the damages caused by sweat and body... more The main causes of leather goods damage is fading as well as the damages caused by sweat and body grease, mechanical deformation and ageing. Tanning agents have varied efficiency on the UV durability and stabilization of collagen. It is because they have different bond strengths and binding mechanisms with leather. In this study, light fastness properties of the leathers tanned with the most commonly used white tanning agents were aimed to evaluate by using ATLAS XENOTEST ALPHA+ test instrument according to ISO 105-B02 standard test method and the leathers tanned with chromium tanning agent were used as a comparison. Blue wool test references were evaluated according to grey scale, and the evaluation of the color change for the tanned and dyed leathers against UV application of an artificial light source representative of natural daylight was carried out. In addition to light fastness test, colorimetric measurements of the treated samples and color changes before and after the UV application were also spectrophotometrically determined by Konica Minolta CM-3600d test device. The results showed that chromium tanned leathers provided the best light fastness results compared to other leathers tanned with white tanning materials. Zirconium and phosphonium tanned leathers had the same values and better than aluminum and vegetable tanned leathers.

Leather and Footwear Journal, 2016

In this study, possibility of using Skipjack Tuna (Katsuwonus pelamis) fish skins as a new and al... more In this study, possibility of using Skipjack Tuna (Katsuwonus pelamis) fish skins as a new and alternative raw material source for leather industry was investigated. The structural and chemical properties of fish skins have a high impact on the preparation of special production recipes and the manufacturing of high performance valuable fish leathers. For this purpose, characteristic properties of Skipjack Tuna fish skins were evaluated by histological, histochemical and chemical methods. The chemical characteristics of fish skins were determined by analyzing fat content (%), total Kjeldahl nitrogen (%), hide substance (%), volatile matter (%), total ash (%) and fatty acid methyl esters and total amino acid content through instrumental analysis. Histological and histochemical analyses were carried out by Hematoxylin-Eosin and Van Gieson staining techniques. As a result of histological and histochemical investigations, fish skins were found thin and tough due to their surface characteristics, had less collagen content compared to other raw materials commonly used in leather industry and the fibers were orientated in parallel but opposite to striated muscles differently from the other skins. Besides, the fat content, Kjeldahl nitrogen, hide substance, volatile matter and total ash of Katsuwonus pelamis fish skins were found 24.47±1.76%, 10.20±0.28%, 57.32±1.55%, 37.33±4.01% and 1.23±0.0002% respectively. The results of the study revealed that Katsuwonus pelamis fish skins could be an alternative raw material to be used in the production of high value added luxury leathers.

Archives of Environmental Protection, 2014

Eco-friendly leather processes based on the usage of natural products have become a potentially a... more Eco-friendly leather processes based on the usage of natural products have become a potentially attractive issue for leather industry during the last few decades. Synthetic protective chemicals like bactericides used in most soaking process are known as hazardous substances and cause tannery effluents with high concentrations of Chemical Oxygen Demand (COD). In the present study, the effect of tannic acid on microorganisms, skin, wool and effluent were investigated in order to demonstrate the applicability of tannic acid in soaking process instead of commonly used bactericides. The bacterial load (cfu/ml), COD and Nitrogen Content (N) of the soaking effluents and Total Kjeldahl Nitrogen (TKN) content of skins and wools were investigated. Application of 0.5 and 1 wt% tannic acid concentrations was more effective than commercial bactericide, while comparable results were achieved by 0.1 and 0.3 wt% tannic acid. The application of tannic acid for soaking process resulted in lower COD a...

WOS: 000391519400006Thermochromic dyes and pigments offer significant potential for functional an... more WOS: 000391519400006Thermochromic dyes and pigments offer significant potential for functional and aesthetic design of smart textile materials and in the area of the leather industry potential application of thermochromic pigment dispersions opens up a new issue. In this study, thermochromic pigments were applied in the leather finishing process in order to obtain leathers changing colour with temperature and their potential for innovative design concepts accompanied with an evaluation of technical features of the materials is presented. Two thermochromic pigments, providing colour change at 15 degrees C and 31 degrees C were applied at different proportions in the base coat of the finishing process. The colour measurements and colour change of the thermochromic leathers were determined by a Minolta CM-3600d spectrophotometer both prior to and subsequent to the rubbing fastness tests. To and fro rubbing, crockmeter and light fastness properties of leathers were examined according to...

Journal of The American Leather Chemists Association, 2011

Environmental Engineering and Management Journal

Leather processing is one of the highly polluting industries, due to generation of significant qu... more Leather processing is one of the highly polluting industries, due to generation of significant quantities of tanned and untanned wastes. Untanned wastes are less contaminated with chemicals and a better source of high value products such as collagen rather than tanned or finished leather wastes. In the present study, collagen dissolution substances (CDS) were prepared from bovine limed split wastes as value added products, by treating leather wastes with sodium hydroxide and fermented dairy by-product. After dissolution processes, the samples were lyophilized and their morphologies were examined with table top scanning electron microscopy (TSEM). The structures of CDS were characterized by X-Ray Diffraction (XRD), differential scanning calorimeter (DSC), and Fourier Transform Infrared Spectrometer (FTIR). In addition to the organoleptic evaluation of CDS, total Kjeldahl nitrogen and fat content, distribution of fatty acid methyl esters and spectrophotometric color determination of CDS were also investigated. The characteristics of CDS revealed that the alkali treatment caused a high degree of dissolution and led to deformation of the collagen structure. In comparison to alkali dissolution, CDS obtained with fermented dairy by product were found to have acceptable chemical and colloidal properties due to the conservation of collagen polypeptide bond structure. Following the results obtained, it may be concluded that fermented dairy by-product may find use for the hydrolyzation of collagen.

The use of high amount water in the industries such as leather, textile and paper causes hazardou... more The use of high amount water in the industries such as leather, textile and paper causes hazardous wastewater for the environment due to the contents of organic compounds and heavy metals. Discharging high amount of leather dyes such as acid and metal complex to ecosystem pose a problem due to their resistance to biological treatments. Vine stem and Turkish red pine sawdust are agricultural wastes and could be an alternative bio-sorbents for the leather industry due to their cost effectiveness. For this purpose, it was aimed to determine the removal efficiencies of the dyestuff Acid Brown 282 SGR by the use of vine stem and Turkish red pine sawdust. The batch adsorption technique was used for the study and the effect of the pH, biosorbent amount and contact time was investigated. The functional groups of the bio-sorbents were determined by attenuated total reflectance spectra (ATR-IR). The biosorption data showed that Langmuir model was the best fitted model for the sorption of Acid Brown 282 SGR. The maximum adsorption capacities were found as 25.91and 26.67 for vine stem and Turkish pine sawdust respectively. The results revealed that vine stem and Turkish red pine sawdust could be used as low-cost biosorbents for the removal of dyestuff remaining after the dyeing process of leathers.

Tekstil ve Mühendis, 2016

Bitkisel tabaklama maddeleri ayakkabılık ve saraciyelik derilerin üretimi yanında ağır, sert ve d... more Bitkisel tabaklama maddeleri ayakkabılık ve saraciyelik derilerin üretimi yanında ağır, sert ve dolgun derilerin üretiminde de kullanılmaktadır. Krom ve diğer inorganik tabaklama maddelerinin ekolojik ikamesi olabilen bitkisel tabaklama maddeleri; hidrofil karakterdedirler, sürtmeye ve güneş ışınlarına karşı hassasiyet gösterirler. Bu özelliklerini geliştirmek için bitkisel tabaklanmış deriler, polimerik malzemelerle muamele edilirler. Çalışmada, farklı oranlarda yağlayıcı akrilik polimerlerin kullanıldığı saraciyelik derilere hızlandırılmış yaşlandırma işlemi uygulanmıştır. Yaşlandırmanın etkisi, derilerin çekme ve yırtılma mukavemeti, su buharı geçirgenliği, sürtme, renk ve ışık haslığı değerleri ile morfolojik özellikleri açısından değerlendirilmiştir. Sonuç olarak, yaşlanmanın olumsuz etkisinin %8 yağlayıcı akrilik uygulaması ile elimine edilebileceği belirlenmiştir.

Moderately halophilic and halotolerant bacteria were isolated from two different regions of Izmir... more Moderately halophilic and halotolerant bacteria were isolated from two different regions of Izmir Bird Paradise sea water ponds and commercial salt samples obtained from Çamaltı Saltern, Izmir. Proteolytic twenty one isolates, developed a transparent halo within the selected sixty nine (69) isolates, were chosen as extracellular protease producers and in the study, the potential usage of these proteolytic isolates in enzymatic dehairing process was investigated to reduce the negative environmental impact of conventional dehairing chemicals for leather industry.

Ekoloji, 2014

ABSTRACT In this research, a new titanium tanning agent (TMW/2) obtained from the wastes of the m... more ABSTRACT In this research, a new titanium tanning agent (TMW/2) obtained from the wastes of the metal industry was investigated in the production of chromium free eco-leather, by experimenting with various amounts of tanning agent and comparing the physical and chemical properties of the tanned leathers. The tanning process was performed with different concentrations of active titanium tanning material such as 1%, 2.5%, 5%, 7.5%, and 10%. The titanium content, chromium oxide content, formaldehyde content, shrinkage temperature, pH value, ash content, and fat content of the tanned leathers were investigated for the determination of chemical characterization. The tensile strength, elongation at break, tear strength, and colour measurement tests were also carried out for investigating the physical properties. The titanium tanned leathers had a mean shrinkage temperature of 79.5 degrees C and more yellowish colour than the chromium tanned leathers. Their tensile strength properties were found similar with chromium leathers, while the elongation at break was found to be lower and tearing resistance was higher. The usage amount of 2.5% could be perfectly advised for the tanning process based on the titanium tanning material for achieving optimal properties required from different leather types such as upholstery, automotive and shoe upper leathers. Consequently, our results showed that this new titanium tanning agent could be used as an alternative tanning material in the production of chromium free eco-leathers considering the visual, physical, and chemical properties of resultant leathers.

In timber production, only the 24% of trees could be turned into timber and used as an end produc... more In timber production, only the 24% of trees could be turned into timber and used as an end product, while the rest becomes the waste of forest goods. Although it is known that the wastes of timbers are utilized in different fields such as energy and composites production in general, their use in the leather industry as a tanning material is seemed to be a new concept. For this purpose, the usage possibilities of the timber wastes of red and black pine in the form of sawdust and bark were aimed to investigate for the leather manufacturing. The red and black pine wastes were extracted at Koch extractor at 90°C for 8 h and the tannin contents, influences on the shrinkage temperature, filling properties and final physical characteristics of the leathers such as tensile strength, elongation at break, tear strength and color measurements were investigated. The results revealed that the red pine barks (Pinus resinosa L.) could be an alternative source of vegetable tannins compared to other timber wastes for the leather industry due to the better extraction yield and tannin content. Besides similar results in terms of tanning properties were obtained with the commonly used vegetable tannins such as valonea and mimosa.

aaqtic.org.ar

Page 1. Potential Usage of Keratinolytic Enzymes isolated from Bacillus cereus in the Leather Ind... more Page 1. Potential Usage of Keratinolytic Enzymes isolated from Bacillus cereus in the Leather Industry Arife Candaş Adıgüzel Zengin*1, Behzat Oral Bitlisli1, Niels Thomas Eriksen2 1Department of Leather Engineering, Engineering ...

Prof. Floarea Nicolae, …

So, the Bioterra University review "Buletin of Scientific Information" works as a real platform f... more So, the Bioterra University review "Buletin of Scientific Information" works as a real platform for the information and exhibition of the most recent and valuable research in the agricultual field and connected sciences (food industry, agro-tourism, ecology, agricultural economics etc.). This way I express my gratitude the contributors to our review, authoritative academic and univeritary names of whose studies are found in the selection done by the scientific board of the review, co-workers with whom we have strong relations of partnership and mutual support in the development and course of some conjointed research projects.