Journal of Leather Science and Engineering最新文献

英文中文

Essential role of isoelectric point of skin/leather in leather processing 皮革等电点在皮革加工中的重要作用

Journal of Leather Science and Engineering

Pub Date : 2022-08-25 DOI: 10.1186/s42825-022-00099-y

Ya-nan Wang, Longyu Hu

引用次数: 7

Functional non-glutaraldehyde treated porcine pericardium for anti-coagulation, anti-calcification, and endothelial proliferation bioprosthetic heart valves 功能性非戊二醛处理的猪心包用于抗凝血、抗钙化和内皮细胞增殖生物人工心脏瓣膜

Journal of Leather Science and Engineering

Pub Date : 2022-08-20 DOI: 10.1186/s42825-022-00098-z

Xiaotong Chen, Tao Yu, Qunshou Kong, Dajun Kuang, Hong Xu, Zhiyu Zhao, Li Yang, Gaocan Li, Haojun Fan, Yunbing Wang

In the last decade, the number of transcatheter heart valve replacement for severe heart valve disease has increased exponentially. Although the bioprosthetic artificial heart valve (BHV) has similar fluid dynamics performance to the original heart valve compared with mechanical heart valve so that there is no need to take long-term anticoagulant drugs to prevent thromboembolism, transcatheter BHV replacement are still at risk for thrombosis during the first few months according to the clinical data. However, the use of antithrombotic drugs can also increase the risk of bleeding. Therefore, it is particularly important to improve the anticoagulant properties for the BHV itself. In this work, a kind of non-glutaraldehyde cross-linked BHV material with excellent antithrombotic ability has been prepared from carboxylated oxazolidine treated porcine pericardium (consisting of collagen, elastin and glycoprotein) with the further graft of the anticoagulant heparin sodium via hydrophilic modified chitosan. Along with the similar mechanical properties and collagen stability comparable to the glutaraldehyde cross-linked porcine pericardium (PP), these functional non-glutaraldehyde cross-linked PPs exhibit better biocompatibility, promoted endothelial proliferation and superior anti-calcification ability. More importantly, excellent anticoagulant activity can be observed in the hematological experiments in vivo and in vitro. In summary, these excellent performances make these functional non-glutaraldehyde cross-linked PPs great potentialities in the BHV applications.

Graphical abstract

在过去的十年中，经导管心脏瓣膜置换术治疗严重心脏瓣膜疾病的数量呈指数增长。虽然生物假体人工心脏瓣膜(BHV)与机械心脏瓣膜相比具有与原心脏瓣膜相似的流体动力学性能，因此不需要长期服用抗凝药物来预防血栓栓塞，但根据临床资料，经导管BHV置换术在最初几个月内仍存在血栓形成的风险。然而，使用抗血栓药物也会增加出血的风险。因此，提高BHV本身的抗凝性能就显得尤为重要。以羧化恶唑烷处理过的猪心包(由胶原蛋白、弹性蛋白和糖蛋白组成)为原料，经亲水性改性壳聚糖接枝抗凝剂肝素钠，制备了一种具有良好抗凝能力的非戊二醛交联BHV材料。这些功能性非戊二醛交联猪心包具有与戊二醛交联猪心包相似的力学性能和胶原稳定性，具有更好的生物相容性、促进内皮细胞增殖和抗钙化能力。更重要的是，在体内和体外的血液学实验中可以观察到良好的抗凝活性。综上所述，这些优异的性能使得这些功能性非戊二醛交联PPs在BHV中具有很大的应用潜力。图形抽象

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引用次数: 3

An exploration of enhancing thermal stability of leather by hydrophilicity regulation: effect of hydrophilicity of phenolic syntan 通过亲水性调节提高皮革热稳定性的探索:酚类化合物亲水性的影响

Journal of Leather Science and Engineering

Pub Date : 2022-08-15 DOI: 10.1186/s42825-022-00096-1

Qingyong Sun, Yunhang Zeng, Yue Yu, Ya-nan Wang, Bi Shi

Effect of retanning on the thermal stability of leather is eliciting increasing attention. However, the relationship between the hydrophilicity of retanning agents and the heat resistance of leather and the corresponding mechanism remain unclear. Herein, phenolic formaldehyde syntans (PFSs) were selected as models to explore the effect of the hydrophilicity of retanning agents on the thermal stability of retanned leather. The thermal stability of leather was closely correlated to the hydrophilic group content (sulfonation degree) of PFSs. As the sulfonation degree increased, the water absorption rate of PFSs and their retanned leathers decreased, whereas the thermal stability of leather increased. Molecular dynamics simulation results proved that the introduction of PFSs could reduce the binding ability of collagen molecules with water and thus decreased the water molecules around the PFS-treated collagen. These results may provide guidance for the tanners to select retanning agents reasonably to improve the thermal stability of leather.

Graphical Abstract

复鞣对皮革热稳定性的影响日益引起人们的关注。然而，复鞣剂的亲水性与皮革耐热性之间的关系及其机理尚不清楚。本文以酚醛鞣剂(pfs)为研究对象，探讨了复鞣剂的亲水性对复鞣革热稳定性的影响。皮革的热稳定性与pfs的亲水基团含量(磺化度)密切相关。随着磺化程度的增加，pfs及其复鞣皮革的吸水率降低，而皮革的热稳定性提高。分子动力学模拟结果证明，pfs的引入降低了胶原分子与水的结合能力，从而减少了经pfs处理的胶原周围的水分子。研究结果可指导制革企业合理选择复鞣剂，提高皮革的热稳定性。图形抽象

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引用次数: 4

Technical and technological constraints facing Tanzania leather value chain: a snapshot of intervention measures 坦桑尼亚皮革价值链面临的技术和技术限制:干预措施的快照

Journal of Leather Science and Engineering

Pub Date : 2022-08-10 DOI: 10.1186/s42825-022-00095-2

Cecilia Rolence China, Rahel Elibariki, Jamal Msami, Stephen Mwombela, Lugano Wilson

The leather value chain starts with livestock, the key source of hides and skins, and the main raw materials for the industry. Despite having the second-largest livestock population in Africa, Tanzania is only the 11th largest exporter of leather on the continent, underlining the disproportionate contribution of the sector to the economy. This study presents the results of a recent assessment aimed at identifying performance bottlenecks in Tanzania's leather sector. The assessment took place in October–December 2020 and involved 10 tanneries, 30 leather goods factories and 11 service providers/institutions. Findings reveal that 90% of tanneries are dissatisfied with the quality of hides and skins due to brand marks, flay cuts, skin diseases, and inadequate curing. These supply chain bottlenecks are further compounded by skill deficiencies among processors, poor waste management, and limited awareness about laws, policies and regulations governing trade in the sector. At the downstream end of the value chain, the trade in leather and related articles is facing competition from high importation of low-grade products like plastic shoes and second-hand products. This paper recommends that efforts to increase leather's economic and trade value need to focus on upgrading Tanzania’s production, processing, branding and marketing capacities.

Graphical Abstract

皮革价值链从牲畜开始，牲畜是皮革和毛皮的主要来源，也是该行业的主要原材料。尽管坦桑尼亚拥有非洲第二大牲畜种群，但它只是非洲大陆第11大皮革出口国，这突显了该部门对经济的不成比例的贡献。本研究提出了最近评估的结果，旨在确定坦桑尼亚皮革部门的性能瓶颈。该评估于2020年10月至12月进行，涉及10家制革厂、30家皮具厂和11家服务提供商/机构。调查结果显示，90%的制革厂对皮革和皮的质量不满意，原因是品牌痕迹、剥皮割伤、皮肤病和处理不当。由于加工商的技能不足、废物管理不善以及对管理该行业贸易的法律、政策和法规的认识有限，这些供应链瓶颈进一步加剧。在价值链的下游，皮革及相关物品贸易面临着塑料鞋等低档产品的大量进口和二手产品的竞争。本文建议，提高皮革的经济和贸易价值的努力需要重点提升坦桑尼亚的生产、加工、品牌和营销能力。图形抽象

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引用次数: 1

Laccase-functionalized magnetic framework composite enabled chlorophenols degradation, a potential remediation for fungicides residues in leather 漆酶功能化的磁框架复合材料使氯酚降解成为一种潜在的皮革杀菌剂残留修复方法

Journal of Leather Science and Engineering

Pub Date : 2022-07-25 DOI: 10.1186/s42825-022-00094-3

Min Cao, Jie Yu, Xing Zhang, Yamei Lin, He Huang

Chlorophenols, used as the fungicides in leather, are strictly limited in leather products. In this work, a metal–organic framework material, zeolitic metal azolate framework-7 (MAF-7), was first used to encapsulate laccase (Lac) to prepare MAF-7/Lac bio-composites with 98.5% immobilization yield. Afterward, Lac/MNP@MOM was formed by introducing the magnetic nanoparticles (MNPs) into the Lac@MOM. MAF-7 with better hydrophilicity and stronger pH buffering ability, exhibits good compatibility with laccase, which can reserve the activity of laccase after immobilization. Moreover, the porous structure of MAF-7 is favorable for the sufficient contact between laccase and substrates. Lac/MNP@MOM exhibited excellent activity when exposed to high temperature, extreme pH, and organic solvents, which also simplified complex recovery steps. Furthermore, the degradation rate of 2,4-dichlorophenol (2,4-DCP) could reach as high as 97% within 24 h by immobilized laccase, and after nine consecutive cycles of operation, enzyme activity could remain over 80%, which gives it the potential for practical applications.

氯酚作为皮革中的杀菌剂，在皮革制品中的使用受到严格限制。本文首次采用金属有机骨架材料——沸石型金属偶氮盐骨架-7 (MAF-7)包封漆酶(Lac)，制备了固定化率为98.5%的MAF-7/Lac生物复合材料。随后，将磁性纳米颗粒(MNPs)引入Lac@MOM，形成Lac/MNP@MOM。MAF-7具有较好的亲水性和较强的pH缓冲能力，与漆酶具有良好的相容性，可以在固定后保留漆酶的活性。此外，MAF-7的多孔结构有利于漆酶与底物之间的充分接触。Lac/MNP@MOM在高温、极端pH和有机溶剂条件下均表现出良好的活性，简化了复杂的回收步骤。此外，固定化漆酶对2,4-二氯苯酚(2,4- dcp)的降解率在24 h内可达97%，连续9个循环后，酶活性可保持在80%以上，具有实际应用潜力。

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引用次数: 4

Advances on the modification and biomedical applications of acellular dermal matrices 脱细胞真皮基质的改性及其生物医学应用研究进展

Journal of Leather Science and Engineering

Pub Date : 2022-07-05 DOI: 10.1186/s42825-022-00093-4

Yining Chen, Xinhua Liu, Xin Zheng, Xuantao Huang, Weihua Dan, Zhengjun Li, Nianhua Dan, Yunbing Wang

Acellular dermal matrix (ADM) is derived from natural skin by removing the entire epidermis and the cell components of dermis, but retaining the collagen components of dermis. It can be used as a therapeutic alternative to “gold standard” tissue grafts and has been widely used in many surgical fields, since it possesses affluent predominant physicochemical and biological characteristics that have attracted the attention of researchers. Herein, the basic science of biologics with a focus on ADMs is comprehensively described, the modification principles and technologies of ADM are discussed, and the characteristics of ADMs and the evidence behind their use for a variety of reconstructive and prosthetic purposes are reviewed. In addition, the advances in biomedical applications of ADMs and the common indications for use in reconstructing and repairing wounds, maintaining homeostasis in the filling of a tissue defect, guiding tissue regeneration, and delivering cells via grafts in surgical applications are thoroughly analyzed. This review expectedly promotes and inspires the emergence of natural raw collagen-based materials as an advanced substitute biomaterial to autologous tissue transplantation.

Graphical Abstract

脱细胞真皮基质(Acellular dermal matrix, ADM)来源于天然皮肤，去除真皮的整个表皮和细胞成分，保留真皮的胶原成分。它可以作为“金标准”组织移植物的治疗选择，并已广泛应用于许多外科领域，因为它具有丰富的主要物理化学和生物学特性，引起了研究人员的注意。本文全面介绍了以ADM为重点的生物制剂基础科学，讨论了ADM的修饰原理和技术，综述了ADM的特点及其用于各种重建和修复目的的证据。此外，还深入分析了ADMs在生物医学应用方面的进展，以及在重建和修复伤口、维持组织缺损填充中的稳态、引导组织再生和通过移植细胞在外科应用中的常见适应症。这一综述有望促进和启发天然胶原基材料作为自体组织移植的先进替代生物材料的出现。图形抽象

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引用次数: 4

Advances on the modification and biomedical applications of acellular dermal matrices 脱细胞真皮基质的改性及其生物医学应用研究进展

Journal of Leather Science and Engineering

Pub Date : 2022-07-05 DOI: 10.1186/s42825-022-00093-4

Yining Chen, Xinhua Liu, Xin Zheng, Xuantao Huang, Weihua Dan, Zhengjun Li, N. Dan, Yunbing Wang

引用次数: 6

Extraction of a novel tanning agent from indigenous plant bark and its application in leather processing 从本土植物树皮中提取一种新型鞣剂及其在皮革加工中的应用

Journal of Leather Science and Engineering

Pub Date : 2022-06-25 DOI: 10.1186/s42825-022-00092-5

Raju Kumar Das, Al Mizan, Fatema Tuj Zohra, Sobur Ahmed, Khondoker Shahin Ahmed, Hemayet Hossain

The use of vegetable tanning materials in leather processing has drawn attention as an alternative to basic chromium sulphate for its natural abundance and environmental aspects. In this work, an attempt has been made to extract vegetable tannins from Xylocarpus granatum bark using different solvents (e.g., water, methanol, ethanol, and chloroform) and compare with conventional vegetable tanning agents such as mimosa and quebracho. The highest extraction efficiency was observed 31.22% by methanol. The presence of tannin content and polyphenolic compounds, e.g. (-)epicatechin (503 mg/100 g dry extract), catechin hydrate (218 mg/100 g dry extract), catechol (29 mg/100 g dry extract) were ensured by UV–Vis, FT-IR spectroscopy and HPLC. Again, condensed tannins, moisture content, and pH of the methanol extracted tannin were found 47.80%, 5.82%, and 3.97 respectively. The leather tanned by Xylocarpus granatum tannin showed a shrinkage temperature of 86.34 ± 1.52 °C. Other properties such as tensile strength, tear strength, grain cracking load, and distention at grain cracking were comparable to conventional vegetable-tanned leather. The cross-sectional morphology of the tanned leathers was also characterized by scanning electron microscopy (SEM) which revealed a compact structure of the leather fibers. In light of the findings from the study, X. granatum bark tannin could be a well alternative to chromium and a new source of vegetable tannin for the leather industry.

Graphical Abstract

在皮革加工中使用植物鞣材料作为碱式硫酸铬的替代品已引起人们的注意，因为它具有天然丰度和环境方面的特点。本研究尝试用不同的溶剂(如水、甲醇、乙醇和氯仿)从木皮中提取植物单宁，并与传统的植物鞣制剂(如含水草鞣制剂和克布拉克鞣制剂)进行比较。甲醇萃取效率最高，为31.22%。通过紫外可见光谱、红外光谱和高效液相色谱法测定单宁含量和多酚类化合物的存在，如(-)表儿茶素(503 mg/100 g干提取物)、儿茶素水合物(218 mg/100 g干提取物)、儿茶酚(29 mg/100 g干提取物)。浓缩单宁、水分含量和pH值分别为47.80%、5.82%和3.97。用木芋鞣制皮革的收缩温度为86.34±1.52℃。其他性能，如抗拉强度、撕裂强度、颗粒开裂载荷和颗粒开裂时的膨胀，与传统的植物鞣革相当。用扫描电子显微镜(SEM)对鞣制皮革的横截面形貌进行了表征，发现皮革纤维结构致密。根据研究结果，石榴树皮单宁可以很好地替代铬，并为皮革工业提供新的植物单宁来源。图形抽象

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引用次数: 11

Natural leather based gamma-ray shielding materials enabled by the coordination of well-dispersed Bi3+/Ba2+ ions and RE2O3 coating 由分散良好的Bi3+/Ba2+离子和RE2O3涂层配合而成的天然皮革基γ射线屏蔽材料

Journal of Leather Science and Engineering

Pub Date : 2022-06-15 DOI: 10.1186/s42825-022-00090-7

Yue Shen, Jibo Zhou, Zheng Han, Hao Li, Linping Yan, Xuepin Liao, Bi Shi

Gamma rays is widely used in modern science and technology, but it may cause health damage to practitioners. In the present study, natural composites based on leather and high-Z elements (atomic number ≥ 56) were fabricated and used as gamma rays shielding materials. These shielding materials were prepared by coating rare earth nanoparticles (Er₂O₃ or La₂O₃) onto the surface of natural leather, which was first impregnated with Bi³⁺ and Ba²⁺. Results show that the attenuation efficiency of the prepared Er_1.31Bi_5.46-NL (1.31 and 5.46 mmol cm⁻³ loaded elements) with thickness of 3.2 mm was 61.57% for incident rays at 121.78 keV (¹⁵²Eu) and reached 96.4% in the incident of 59.5 keV (²⁴¹Am), which is comparable to that of 0.25-mm lead plate (54.54 mmol cm⁻³). In addition, these natural-leather-based shielding materials exhibited low density (approximately 1/10 of Pb), high strength and wearable behaviors.

Graphical abstract

伽马射线在现代科学技术中被广泛应用，但它可能对从业人员的健康造成损害。在本研究中，制备了基于皮革和高z元素(原子序数≥56)的天然复合材料，并将其用作伽马射线屏蔽材料。这些屏蔽材料是通过在天然皮革表面涂覆稀土纳米粒子(Er2O3或La2O3)，并首先浸渍Bi3+和Ba2+制备的。结果表明，制备的厚度为3.2 mm的Er1.31Bi5.46-NL(负载元素为1.31和5.46 mmol cm−3)在121.78 keV (152Eu)入射光线下的衰减效率为61.57%，在59.5 keV (241Am)入射光线下的衰减效率为96.4%，与0.25 mm铅板(54.54 mmol cm−3)相当。此外，这些天然皮革基屏蔽材料具有低密度(约为Pb的1/10)、高强度和耐磨性能。图形抽象

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引用次数: 4

Leather for flexible multifunctional bio-based materials: a review 柔性多功能生物基皮革材料研究进展

Journal of Leather Science and Engineering

Pub Date : 2022-06-10 DOI: 10.1186/s42825-022-00091-6

Zhongxue Bai, Xuechuan Wang, Manhui Zheng, Ouyang Yue, Long Xie, Siyu Zha, Shuyin Dong, Tong Li, Yanyan Song, Mengchen Huang, Xinhua Liu

Nowadays, diverse leather usage conditions and increasing demands from consumers challenge the leather industry. Traditional leather manufacturing is facing long-term challenges, including low-value threshold, confined application fields, and environmental issues. Leather inherits all the biomimetic properties of natural skin such as flexibility, sanitation, cold resistance, biocompatibility, biodegradability, and other cross-domain functions, achieving unremitting attention in multi-functional bio-based materials. Series of researches have been devoted to creating and developing leather-based flexible multi-functional bio-materials, including antibacterial leather, conductive leather, flame-retardant leather, self-cleaning leather, aromatic leather, and electromagnetic shielding leather. In this review, we provide a comprehensive overview of the commonly used leather-based functional materials. Furthermore, the possible challenges for the development of functional leathers are proposed, and expected development directions of leather-based functional materials are discussed. This review may promote and inspire the emerging preparation and applications of leather for flexible functional bio-based materials.

Graphical Abstract

如今，多样化的皮革使用条件和消费者日益增长的需求对皮革行业提出了挑战。传统的皮革制造面临着长期的挑战，包括低价值门槛、有限的应用领域和环境问题。皮革继承了天然皮肤的所有仿生特性，如柔韧性、卫生性、耐寒性、生物相容性、生物降解性等跨领域功能，在多功能生物基材料中得到了不懈的关注。在抗菌革、导电革、阻燃革、自洁革、芳香革、电磁屏蔽革等革基柔性多功能生物材料的研制和开发方面进行了一系列的研究。本文对常用的革基功能材料进行了综述。最后，提出了功能皮革发展中可能面临的挑战，并对皮革基功能材料的发展方向进行了展望。本文的研究对皮革柔性功能生物基材料的制备和应用具有一定的促进和启示作用。图形抽象

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引用次数: 9

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