Journal of The American Leather Chemists Association最新文献_第5页

High Performance Leather based on in Situ Formation of Reduced Graphene Oxide in Chrome Tanning 基于还原氧化石墨烯在铬鞣中原位形成的高性能皮革

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-29 DOI: 10.34314/jalca.v117i5.4917

Xinle Yang, Yanchun Li, Mao Yang, Xugang Dang, Shan Cao

{"title":"High Performance Leather based on in Situ Formation of Reduced Graphene Oxide in Chrome Tanning","authors":"Xinle Yang, Yanchun Li, Mao Yang, Xugang Dang, Shan Cao","doi":"10.34314/jalca.v117i5.4917","DOIUrl":"https://doi.org/10.34314/jalca.v117i5.4917","url":null,"abstract":"A novel method of high performance leather prepared via in situ reduction of graphene oxide after tanning was proposed in this research. First, nano-graphene oxide (GO) was prepared by an improved Hummers method. Then, the prepared GO was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Finally, GO was added during the chrome tanning process, and GO was reduced by ascorbic acid after the chrome tanning was completed. Moreover, the shrinkage temperature, tensile strength, tear strength and thermal conductivity of the finished leather were investigated. The results showed that the absorption of chrome tanning agent was significantly improved by the addition of GO. The tensile strength, tear strength, and the thermal conductivity of the resulted leather obviously surpassed the leather tanned by chrome tanning agent. Specifically, the tensile strength and tear strength of the leather reached 21.25 MPa and 163.95 N·mm-1 , respectively, when the amount of reducing agent was ten times the amount of GO. A combination of the tanning of leather and the in situ reduction of GO is expected to become a new processing method for preparation of high performance.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"45 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91071913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Manufacture of Exotic Leather and Small Leather Goods from Ovine Stomach 用羊胃制取异域皮革及小皮具

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-29 DOI: 10.34314/jalca.v117i5.4914

Peris N. Wainaina, B. Ongarora, Paul K Tanui

{"title":"Manufacture of Exotic Leather and Small Leather Goods from Ovine Stomach","authors":"Peris N. Wainaina, B. Ongarora, Paul K Tanui","doi":"10.34314/jalca.v117i5.4914","DOIUrl":"https://doi.org/10.34314/jalca.v117i5.4914","url":null,"abstract":"Leathers made from exotic skins or rare parts of animals have very good market value. The exotic leathers are usually preferred because of their patterns, naturally occurring marks and their unique structures. The objective of this study was to investigate the feasibility of tanning the ovine stomach into novelty leather and leather products. The ovine stomach was converted into an exotic leather using oil tanning methodology, with goat oil as a tanning agent. The rumen and reticulum parts of the stomach were taken through pre-tanning, tanning and post-tanning operation. The resultant leather had a different grain from the ordinary leather. Then mechanical operations like drying, toggling and staking were done. Physical properties of the leathers were analyzed by determining their thickness, tensile strength, elongation at break, tear strength, flex endurance and ball burst extension test. The grain structure of the leathers was analyzed using a light microscope. The results of physical tests were poor compared to the grains of conventional leathers since the composition of raw outer coverings of animals and those of the stomach are different. The leather processed from this non-conventional source has been found suitable for manufacturing fancy small leather goods like coin purse, key holders, purses and wallets.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"14 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83675158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ensemble of Fine-Tuned Deep Learning Networks for Wet-Blue Leather Segmentation 用于湿蓝皮革分割的微调深度学习网络集成

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-05 DOI: 10.34314/jalca.v117i4.4900

Masood Aslam, T. M. Khan, S. Naqvi, Geoff Holmes

引用次数: 1

Synthesis of Multi-Site Polyether Amine Triazine Derivative for Sustainable Leather Manufacturing

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-05 DOI: 10.34314/jalca.v117i4.4897

Xinju Jia, Ran Tan, B. Peng

引用次数: 0

Antibacterial Properties of Several Lichen Extracts against Two Moderately Halophilic Bacteria from Salted Sheepskins 几种地衣提取物对盐渍羊皮中两种中度嗜盐细菌的抑菌性能

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-05 DOI: 10.34314/jalca.v117i4.4898

I. Türkmenoğlu, Orçun Toksöz, D. Berber, P. Çağlayan, M. Birbir, N. C. Sesal

{"title":"Antibacterial Properties of Several Lichen Extracts against Two Moderately Halophilic Bacteria from Salted Sheepskins","authors":"I. Türkmenoğlu, Orçun Toksöz, D. Berber, P. Çağlayan, M. Birbir, N. C. Sesal","doi":"10.34314/jalca.v117i4.4898","DOIUrl":"https://doi.org/10.34314/jalca.v117i4.4898","url":null,"abstract":"It is well known that possible undesirable defects in finished leathers can result from microbial activities on the salted raw hides/skins during storage. The traditionally used salt curing method can control bacterial activities on the raw stock, but it does not seem possible to completely eliminate microbial attacks. Moderately halophilic bacteria can cause serious damage to hides/skins. From this point of view, potential procedures such as applying new antibacterialagents in the leather industry should be considered. Since some lichen species have been indicated for their promising biological efficacies in the literature; most researchers have focused on their potencies in various fields including leather industry from ancient times. In this study, the bacterial growth of proteolytic and lipolytic Gram-negative moderately halophilic bacteria, Chromohalobacter canadensis (YN6) and Halomonas eurihalina (BL5), from saltedsheepskin samples were tested with the extracts of Usnea sp., Plastismatia glauca, Ramalina farinacea, Evernia divaricata, Bryoria capillaris, Hypogymnia tubulosa, Pseudevernia furfuracea and Lobaria pulmonaria. Some of these lichen species were found to be successful to inhibit the bacterial growth of C. canadensis (YN6) and H. eurihalina (BL5). In conclusion, lichen extracts may be utilized in stacked raw hides/skins in tanneries or warehouses to control moderately halophilic bacteria which causes several defects on leather.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"9 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85230364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Novel Ester-bonded Gemini Quaternary Ammonium Salt with Good Antimicrobial Activity and Anti-mold Performance for Wet Blue Leather 新型双基酯键季铵盐具有良好的抗菌和防霉性能

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-05 DOI: 10.34314/jalca.v117i4.4896

Tao Zhang, Chunhua Wang, Jun Sang, Long Zhang, Yuanhang Xiao, Wei Lin

{"title":"Novel Ester-bonded Gemini Quaternary Ammonium Salt with Good Antimicrobial Activity and Anti-mold Performance for Wet Blue Leather","authors":"Tao Zhang, Chunhua Wang, Jun Sang, Long Zhang, Yuanhang Xiao, Wei Lin","doi":"10.34314/jalca.v117i4.4896","DOIUrl":"https://doi.org/10.34314/jalca.v117i4.4896","url":null,"abstract":"Herein, we have developed a kind of novel ester-bonded gemini quaternary ammonium salts microbicides named QAS(n+m) for leather application, in which n and m denotes the number of −CH2 between the ester groups on the spacer, and the length of alkyl chain connected to ester groups on the hydrophobic tail chain, respectively. Results indicate that the hydrophobic tail lengths and the spacer lengths in the QAS(n+m) structures affect their antimicrobial activities very differently. QAS(4+10) was used to investigate the antimicrobial mechanism, cytotoxicity, and antimold performance for wet blue leather as it exhibits the strongest antimicrobial effect. It shows QAS(4+10) is capable of inactivating microorganisms mainly by disrupting the integrity of their cell membranes. Compared to commercial leather microbicide product 2-thiocyanomethylthiobenzothiazole (TCMTB), QAS(4+10) exhibits comparable mold resistance and lower toxicity. The present work gives positive insight into the development of novel candidate microbicides for the preservation of wet blue leather.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84824971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient Removal of Ammonia-Nitrogen from Deliming Effluent by using Magnesium Ammonium Phosphate Precipitation Method 磷酸铵镁沉淀法高效去除污水中的氨氮

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-01 DOI: 10.34314/jalca.v117i3.4891

Hao Wang, Chao Lei, Yunhang Zeng, Hongguang Guo, Bi Shi

{"title":"Efficient Removal of Ammonia-Nitrogen from Deliming Effluent by using Magnesium Ammonium Phosphate Precipitation Method","authors":"Hao Wang, Chao Lei, Yunhang Zeng, Hongguang Guo, Bi Shi","doi":"10.34314/jalca.v117i3.4891","DOIUrl":"https://doi.org/10.34314/jalca.v117i3.4891","url":null,"abstract":"Ammonia nitrogen (NH 3 -N) pollutant has received much attention in the leather industry. An efficient strategy for removal of NH 3 -N from tannery wastewater was proposed by using a magnesium ammonium phosphate (MAP) precipitation method to remove NH 3 -N from deliming effluent with the highest NH 3 -N concentration among all leather-making effluents. Results showed that approximately 80% of NH 3 -N was removed from deliming effluent when reacting at P/Mg/N mole ratio of 1.2:1.2:1.0 and pH 9.5 for 20 min. The NH 3 -N and total nitrogen concentrations of tannery wastewater (a composite wastewater of all leather-making effluents) sharply decreased by treating deliming effluent with MAP precipitation, which greatly improved the biological treatment efficiency of tannery wastewater. The residual concentration of NH 3 -N in the treated tannery wastewater was less than 2 mg/L. The total phosphorus concentration of tannery wastewater increased by less than 0.4 mg/L, indicating that secondary pollution of phosphorus did not occur after MAP precipitation treatment.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"50 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91280496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Novel Approach of Removing Externally Attached Debris from Animal Carcass to Ensure Meat Safety and Byproduct Quality 去除动物胴体外部附着碎片以确保肉类安全和副产品质量的新方法

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-01 DOI: 10.34314/jalca.v117i3.4888

Majher I. Sarker, Cheng‐Kung Liu

{"title":"Novel Approach of Removing Externally Attached Debris from Animal Carcass to Ensure Meat Safety and Byproduct Quality","authors":"Majher I. Sarker, Cheng‐Kung Liu","doi":"10.34314/jalca.v117i3.4888","DOIUrl":"https://doi.org/10.34314/jalca.v117i3.4888","url":null,"abstract":"In this study, a formulation and technique are developed to be used for cattle carcass decontamination prior to removal of hide in a commercially preferred time-frame to ensure meat safety and byproduct quality. This formulation offers deep cleaning on carcass surface by removing debris including manure/mud balls which are firmly attached to the hair of animal hide harboring pathogens like Salmonella and Escherichia coli. Survival of such pathogens can facilitate cross-contamination of the underlying meat and meat-processing equipment in the packing plant posing a challenge to the meat industry as well as public-health. Also, the attached adobe type mud/manure balls have potential to create holes on the hide during leather processing which degrades byproduct’s quality. Formulation was sprayed on cattle’s hide and the attached debris were brushed off from the surface. The formulation was found very efficient in cleaning the hide surface both at 5 and 8 min treatments. The highest of aerobic, Escherichia coli and Salmonella populations were reduced by 8.71, 3.63 and 3.19 Log CFU/50 in 2 , respectively when compared to water-wash. The efficacy of formulation can be optimized by adjusting its concentration and treatment time. Post-leather analysis showed no detrimental impact on byproduct caused by the formulation.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"2 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90289891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterologous Expression of Alkaline Metalloproteinases in Bacillus Subtilis SCK6 for Eco-Friendly Enzymatic Unhairing of Goatskins 碱性金属蛋白酶在枯草芽孢杆菌SCK6中生态脱毛的异源表达

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-01 DOI: 10.34314/jalca.v117i3.4892

Shihao Zhang, Ruoshi Zhang, Xiaoguang Li, Zhe Xu, Yongqiang Tian

{"title":"Heterologous Expression of Alkaline Metalloproteinases in Bacillus Subtilis SCK6 for Eco-Friendly Enzymatic Unhairing of Goatskins","authors":"Shihao Zhang, Ruoshi Zhang, Xiaoguang Li, Zhe Xu, Yongqiang Tian","doi":"10.34314/jalca.v117i3.4892","DOIUrl":"https://doi.org/10.34314/jalca.v117i3.4892","url":null,"abstract":"In this study, alkaline metalloprotease gene 1067 was cloned from Planococcus halotolerans SCU63T and heterologously expressed in Bacillus subtilis SCK6. Using Luria Bertani (LB) broth medium as the initial medium, the optimal medium was obtained through a series of fermentation and culture optimization (g/L): yeast extract (10), soybean powder (15), urea (20), potassium chloride (6.7), calcium chloride (13.3), NaCl (10). On the basis of the optimal medium, the highest enzymatic activity of 1259.21 U/mL could be obtained by culturing at 30°C for 40 h. with pH 8, inoculation amount of 4% and filling amount of 50 mL. EDTA inhibits protease activity and PMSF promotes it, indicating that it was a metalloprotease rather than a serine protease. The optimum reaction temperature of the protease is 70°C, and the optimum pH is 9. The metal ions Zn 2+, Co2+ and surfactant β-ME, Tween 80 can improve the activity of the protease. The results of unhairing, SEM and staining show that this metalloprotease can completely dehair goatskin. Compared with the conventional chemical method, the goatskin after enzymatic unhairing has softer texture and smoother surface, and there is no obvious damage to the goatskin.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"68 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89501327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Construction of a Chrome-free Tanning System Based on Highly-oxidized Starch–Zirconium Complexes 基于高氧化淀粉-锆配合物的无铬鞣体系的构建

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2022-04-01 DOI: 10.34314/jalca.v117i3.4887

Yue Yu, Hui Wang, Ya-nan Wang, Jianfei Zhou, Bi Shi

{"title":"Construction of a Chrome-free Tanning System Based on Highly-oxidized Starch–Zirconium Complexes","authors":"Yue Yu, Hui Wang, Ya-nan Wang, Jianfei Zhou, Bi Shi","doi":"10.34314/jalca.v117i3.4887","DOIUrl":"https://doi.org/10.34314/jalca.v117i3.4887","url":null,"abstract":"Chrome-free leather manufacture is one of the major focuses of leather industry. In this work, a chrome-free tanning system based on highly-oxidized starch–zirconium complexes (HOS–Zr) was constructed. Particle size and charge properties analyses revealed that the small size (2.5 nm) and the low cationic species content (45.1%) of HOS–Zr at low pH facilitated its uniform penetration in leather at the initial stage of tanning, and the large size (89–169 nm) and the high cationic species content (77.5%) of HOS–Zr after basification contributed to its stable crosslinking between collagen fibers. A 3% HOS–Zr offer (based on the weight of ZrO2) imparted wet white with sufficient tanning effect. The physical properties of HOS–Zr crust leather were remarkably better than those of lactic acid–zirconium crust leather and were comparable to those of chrome crust leather. Wastewater in HOS–Zr tanning system showed a reduction in TOC load by 40.0% and higher biodegradability compared with chrome tanning system. As a result, this work provided a practical and sustainable approach to eliminate chrome in leather manufacture.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":"161 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75406533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2