Hide and skin are complex tissue where the most abundant component is collagen. Matrix metalloproteinases and bacterial collagenases are two kinds of collagenases that can cleave the triple-helical domain of native fibrillar collagens. In this paper, the family members and domain composition of matrix metalloproteinases and bacterial collagenases are summarized. The catalytic mechanism of collagen hydrolysis by collagenases is described, and the methods adopted to date for investigating and regulating collagenases and their inhibitors are reviewed. Furthermore, the applications of collagenases and their inhibitors in biomedicine, food processing and the enzymatic unhairing process in the leather-making industry are presented.
{"title":"Collagenases and their inhibitors: a review","authors":"Sijin Wu, Xuewei Zhou, Zhicheng Jin, Haiming Cheng","doi":"10.1186/s42825-023-00126-6","DOIUrl":"10.1186/s42825-023-00126-6","url":null,"abstract":"<div><p>Hide and skin are complex tissue where the most abundant component is collagen. Matrix metalloproteinases and bacterial collagenases are two kinds of collagenases that can cleave the triple-helical domain of native fibrillar collagens. In this paper, the family members and domain composition of matrix metalloproteinases and bacterial collagenases are summarized. The catalytic mechanism of collagen hydrolysis by collagenases is described, and the methods adopted to date for investigating and regulating collagenases and their inhibitors are reviewed. Furthermore, the applications of collagenases and their inhibitors in biomedicine, food processing and the enzymatic unhairing process in the leather-making industry are presented.\u0000</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00126-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4753818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-06DOI: 10.1186/s42825-023-00125-7
Mónica Gisel Arellano-Sánchez, Juliette Vievard, Lamia Moufarrej, Christine Devouge-Boyer, Marie Hubert-Roux, Carlos Afonso, Mélanie Mignot
In the present work, a comparative study of analytical methods for the simultaneous and quantitative determination of trivalent and hexavalent chromium is presented. For the analysis by ion chromatography-inductively coupled plasma-mass spectrometry, two different columns were tested, as well as different mobile phases and different pH of the samples. The optimized analytical method permitted the separation of Cr(III) and Cr(VI) using 75 mmol/L NH4NO3 pH 3 as chromatographic eluent. The method was validated and applied to real samples, allowing the determination of both species simultaneously, even when there is a huge difference of concentration between Cr(III) and Cr(VI). Limit of detection and limit of quantification for Cr(III) were found to be 0.016 and 0.054 (upmu)g/L (0.3 and 1.1 (upmu)g/kg), respectively, and for Cr(VI) 0.13 and 0.43 (upmu)g/L (7 and 22 (upmu)g/kg), respectively. Possible species interconversions were monitored through the use of chromium isotopic standards, which confirmed that the optimized methodology preserves chromium speciation during extraction and analysis. Fourier-transform ion cyclotron resonance-mass spectrometry permitted the structure elucidation of the complex formed during ethylenediaminetetraacetic acid extraction.
{"title":"Separation, speciation and quantification of both chromium (VI) and chromium (III) in tanned leather samples: a comparative study and validation of analytical methods","authors":"Mónica Gisel Arellano-Sánchez, Juliette Vievard, Lamia Moufarrej, Christine Devouge-Boyer, Marie Hubert-Roux, Carlos Afonso, Mélanie Mignot","doi":"10.1186/s42825-023-00125-7","DOIUrl":"10.1186/s42825-023-00125-7","url":null,"abstract":"<div><p>In the present work, a comparative study of analytical methods for the simultaneous and quantitative determination of trivalent and hexavalent chromium is presented. For the analysis by ion chromatography-inductively coupled plasma-mass spectrometry, two different columns were tested, as well as different mobile phases and different pH of the samples. The optimized analytical method permitted the separation of Cr(III) and Cr(VI) using 75 mmol/L NH<sub>4</sub>NO<sub>3</sub> pH 3 as chromatographic eluent. The method was validated and applied to real samples, allowing the determination of both species simultaneously, even when there is a huge difference of concentration between Cr(III) and Cr(VI). Limit of detection and limit of quantification for Cr(III) were found to be 0.016 and 0.054 <span>(upmu)</span>g/L (0.3 and 1.1 <span>(upmu)</span>g/kg), respectively, and for Cr(VI) 0.13 and 0.43 <span>(upmu)</span>g/L (7 and 22 <span>(upmu)</span>g/kg), respectively. Possible species interconversions were monitored through the use of chromium isotopic standards, which confirmed that the optimized methodology preserves chromium speciation during extraction and analysis. Fourier-transform ion cyclotron resonance-mass spectrometry permitted the structure elucidation of the complex formed during ethylenediaminetetraacetic acid extraction.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00125-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4586449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-31DOI: 10.1186/s42825-023-00123-9
Jiachang Liu, Xin Fan, Didier Astruc, Haibin Gu
The construction of biomass-based conductive hydrogel e-skins with high mechanical properties is the research hotspot and difficulty in the field of biomass materials. Traditional collagen-based conductive hydrogels, constructed by the typical “bottom–up” strategy, normally have the incompatible problem between high mechanical property and high collagen content, and the extraction of collagen is often necessary. To solve these problems, inspired by the high mechanical properties and high collagen content of animal skins, this work proposed a “top–down” construction strategy, in which the extraction of collagen was unnecessary and the skin collagen skeleton (SCS) with the 3D network structure woven by natural collagen fibers in goatskin was preserved and used as the basic framework of hydrogel. Following a four-step route, namely, pretreatment → soaking in AgNPs (silver nanoparticles) solution → soaking in the mixed solution containing HEA (2-hydroxyethyl methacrylate) and AlCl3 → polymerization, this work successfully achieved the fabrication of a new skin-based conductive hydrogel e-skin with high mechanical properties (tensile strength of 2.97 MPa, toughness of 6.23 MJ·m−3 and breaking elongation of 428%) by using goatskin as raw material. The developed skin hydrogel (called PH@Ag) possessed a unique structure with the collagen fibers encapsulated by PHEA, and exhibited satisfactory adhesion, considerable antibacterial property, cytocompatibility, conductivity (3.06 S·m−1) and sensing sensitivity (the maximum gauge factor of 5.51). The PH@Ag e-skin could serve as strain sensors to accurately monitor and recognize all kinds of human motions such as swallowing, frowning, walking, and so on, and thus is anticipated to have considerable application prospect in many fields including flexible wearable electronic devices, health and motion monitoring.
{"title":"Robust conductive skin hydrogel e-skin constructed by top–down strategy for motion-monitoring","authors":"Jiachang Liu, Xin Fan, Didier Astruc, Haibin Gu","doi":"10.1186/s42825-023-00123-9","DOIUrl":"10.1186/s42825-023-00123-9","url":null,"abstract":"<div><p>The construction of biomass-based conductive hydrogel e-skins with high mechanical properties is the research hotspot and difficulty in the field of biomass materials. Traditional collagen-based conductive hydrogels, constructed by the typical “bottom–up” strategy, normally have the incompatible problem between high mechanical property and high collagen content, and the extraction of collagen is often necessary. To solve these problems, inspired by the high mechanical properties and high collagen content of animal skins, this work proposed a “top–down” construction strategy, in which the extraction of collagen was unnecessary and the skin collagen skeleton (SCS) with the 3D network structure woven by natural collagen fibers in goatskin was preserved and used as the basic framework of hydrogel. Following a four-step route, namely, pretreatment → soaking in AgNPs (silver nanoparticles) solution → soaking in the mixed solution containing HEA (2-hydroxyethyl methacrylate) and AlCl<sub>3</sub> → polymerization, this work successfully achieved the fabrication of a new skin-based conductive hydrogel e-skin with high mechanical properties (tensile strength of 2.97 MPa, toughness of 6.23 MJ·m<sup>−3</sup> and breaking elongation of 428%) by using goatskin as raw material. The developed skin hydrogel (called PH@Ag) possessed a unique structure with the collagen fibers encapsulated by PHEA, and exhibited satisfactory adhesion, considerable antibacterial property, cytocompatibility, conductivity (3.06 S·m<sup>−1</sup>) and sensing sensitivity (the maximum gauge factor of 5.51). The PH@Ag e-skin could serve as strain sensors to accurately monitor and recognize all kinds of human motions such as swallowing, frowning, walking, and so on, and thus is anticipated to have considerable application prospect in many fields including flexible wearable electronic devices, health and motion monitoring.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00123-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4066087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-30DOI: 10.1186/s42825-023-00124-8
El-Shahat H. A. Nashy, Adel Gabr Abdel-Razek, Minar Mahmoud M. Hassanein, Ghada A. Abo-Elwafa, Hamed Elsayed
The deodorizer distillate (DD) is a byproduct of vegetable oil processing industry and is rich in functional bioactive components. This study aimed to employ phosphorylation modification for DD to produce a new sustainable fatliquor. The bioactive ingredients in DD, namely fatty acids, sterols, and tocopherols, were determined by using HPLC and GLC. The results revealed that the DD sample contained a high percentage of unsaturated fatty acids (72.3%) and high levels of γ and δ-tocopherols (54.8% and 31.60%, respectively). Mechanical parameters (tensile strength, elongation at break, and tear strength) of leather were improved after being treated with the prepared fatliquor emulsion. Eventually, SEM showed that the texture of the fatliquored leather had been remarkably enhanced. Moreover, the fatliquored leather possessed effective antibacterial effect against the specified +ve, −ve bacteria, and Candida albicans microorganisms. The strength, fullness, soft handle, and elasticity of leather were all improved, and the grain of leather was protected from becoming loose after drying.
{"title":"Valorization of sustainable vegetable oil deodorizer distillate as a novel fatliquor","authors":"El-Shahat H. A. Nashy, Adel Gabr Abdel-Razek, Minar Mahmoud M. Hassanein, Ghada A. Abo-Elwafa, Hamed Elsayed","doi":"10.1186/s42825-023-00124-8","DOIUrl":"10.1186/s42825-023-00124-8","url":null,"abstract":"<div><p>The deodorizer distillate (DD) is a byproduct of vegetable oil processing industry and is rich in functional bioactive components. This study aimed to employ phosphorylation modification for DD to produce a new sustainable fatliquor. The bioactive ingredients in DD, namely fatty acids, sterols, and tocopherols, were determined by using HPLC and GLC. The results revealed that the DD sample contained a high percentage of unsaturated fatty acids (72.3%) and high levels of γ and δ-tocopherols (54.8% and 31.60%, respectively). Mechanical parameters (tensile strength, elongation at break, and tear strength) of leather were improved after being treated with the prepared fatliquor emulsion. Eventually, SEM showed that the texture of the fatliquored leather had been remarkably enhanced. Moreover, the fatliquored leather possessed effective antibacterial effect against the specified +ve, −ve bacteria, and Candida albicans microorganisms. The strength, fullness, soft handle, and elasticity of leather were all improved, and the grain of leather was protected from becoming loose after drying.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00124-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5164808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Renewable and low-cost biomass is an ideal sustainable alternative to petroleum-based resources, but producing biomass-based carbon electrode with high performances remains a challenge. Herein, we propose a facile self-assembly strategy to fabricate a biomass-derived N, S co-doping carbon electrode from lignosulfonate without any activation or template process. Taking advantage of the coordination between Fe ions and lignosulfonate, the resultant carbon exhibits a spherical structure with abundant graphitized nanosheets, leading to a high specific surface area with rational pore structure, which are beneficial to the electron/ion transport and storage. The high contents of doping N (8.47 wt%) and S (2.56 wt%) significantly boost the electrochemical performances. As a supercapacitor electrode, the carbon material displays high specific capacitance of 390 F g−1, excellent cycling stability and high energy density of 14.7 W h kg−1 at a power density of 450 W kg−1. This study provides a potential strategy for synthesizing cost-effective heteroatom-doped carbon materials from biomass with abundant functional groups and heteroatom sources, such as chitosan, collagen, and gelatin.
Graphical Abstract
可再生和低成本的生物质是石油基资源的理想可持续替代品，但生产高性能的生物质基碳电极仍然是一个挑战。在此，我们提出了一种简单的自组装策略，以木质素磺酸盐制备生物质来源的N, S共掺杂碳电极，无需任何活化或模板过程。利用铁离子与木质素磺酸盐之间的配位作用，合成的碳具有丰富的石墨化纳米片的球形结构，具有较高的比表面积和合理的孔结构，有利于电子/离子的传递和储存。高含量的N (8.47 wt%)和S (2.56 wt%)显著提高了电化学性能。作为超级电容器电极，碳材料具有390 F g−1的高比电容、优异的循环稳定性和在450 W kg−1的功率密度下14.7 W h kg−1的高能量密度。本研究为从具有丰富官能团和杂原子来源的生物质中合成具有成本效益的杂原子掺杂碳材料提供了一种潜在的策略，如壳聚糖、胶原蛋白和明胶。图形抽象
{"title":"Self-assembly fabrication of lignin-derived carbon with dual heteroatoms doping for high-performance supercapacitor","authors":"Zehong Chen, Haihong Lai, Hao Zhuo, Yu Lin Zhong, Linxin Zhong, Xinwen Peng","doi":"10.1186/s42825-023-00122-w","DOIUrl":"10.1186/s42825-023-00122-w","url":null,"abstract":"<div><p>Renewable and low-cost biomass is an ideal sustainable alternative to petroleum-based resources, but producing biomass-based carbon electrode with high performances remains a challenge. Herein, we propose a facile self-assembly strategy to fabricate a biomass-derived N, S co-doping carbon electrode from lignosulfonate without any activation or template process. Taking advantage of the coordination between Fe ions and lignosulfonate, the resultant carbon exhibits a spherical structure with abundant graphitized nanosheets, leading to a high specific surface area with rational pore structure, which are beneficial to the electron/ion transport and storage. The high contents of doping N (8.47 wt%) and S (2.56 wt%) significantly boost the electrochemical performances. As a supercapacitor electrode, the carbon material displays high specific capacitance of 390 F g<sup>−1</sup>, excellent cycling stability and high energy density of 14.7 W h kg<sup>−1</sup> at a power density of 450 W kg<sup>−1</sup>. This study provides a potential strategy for synthesizing cost-effective heteroatom-doped carbon materials from biomass with abundant functional groups and heteroatom sources, such as chitosan, collagen, and gelatin.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00122-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4509732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-06DOI: 10.1186/s42825-023-00120-y
Bo Zhang, Yunxiang He, Jialing Liu, Jiaojiao Shang, Chider Chen, Tianyi Wang, Mei Chen, Yifei Li, Guidong Gong, Jie Fang, Zhihe Zhao, Junling Guo
The oral and craniofacial region consists of various types of hard and soft tissues with the intricate organization. With the high prevalence of tissue defects in this specific region, it is highly desirable to enhance tissue regeneration through the development and use of engineered biomaterials. Collagen, the major component of tissue extracellular matrix, has come into the limelight in regenerative medicine. Although collagen has been widely used as an essential component in biomaterial engineering owing to its low immunogenicity, high biocompatibility, and convenient extraction procedures, there is a limited number of reviews on this specific clinic sector. The need for mechanical enhancement and functional engineering drives intensive efforts in collagen-based biomaterials concentrating on therapeutical outcomes and clinical translation in oral and craniofacial tissue regeneration. Herein, we highlighted the status quo of the design and applications of collagen-based biomaterials in oral and craniofacial tissue reconstruction. The discussion expanded on the inspiration from the leather tanning process on modifications of collagen-based biomaterials and the prospects of multi-tissue reconstruction in this particular dynamic microenvironment. The existing findings will lay a new foundation for the optimization of current collagen-based biomaterials for rebuilding oral and craniofacial tissues in the future.
{"title":"Advancing collagen-based biomaterials for oral and craniofacial tissue regeneration","authors":"Bo Zhang, Yunxiang He, Jialing Liu, Jiaojiao Shang, Chider Chen, Tianyi Wang, Mei Chen, Yifei Li, Guidong Gong, Jie Fang, Zhihe Zhao, Junling Guo","doi":"10.1186/s42825-023-00120-y","DOIUrl":"10.1186/s42825-023-00120-y","url":null,"abstract":"<div><p>The oral and craniofacial region consists of various types of hard and soft tissues with the intricate organization. With the high prevalence of tissue defects in this specific region, it is highly desirable to enhance tissue regeneration through the development and use of engineered biomaterials. Collagen, the major component of tissue extracellular matrix, has come into the limelight in regenerative medicine. Although collagen has been widely used as an essential component in biomaterial engineering owing to its low immunogenicity, high biocompatibility, and convenient extraction procedures, there is a limited number of reviews on this specific clinic sector. The need for mechanical enhancement and functional engineering drives intensive efforts in collagen-based biomaterials concentrating on therapeutical outcomes and clinical translation in oral and craniofacial tissue regeneration. Herein, we highlighted the status quo of the design and applications of collagen-based biomaterials in oral and craniofacial tissue reconstruction. The discussion expanded on the inspiration from the leather tanning process on modifications of collagen-based biomaterials and the prospects of multi-tissue reconstruction in this particular dynamic microenvironment. The existing findings will lay a new foundation for the optimization of current collagen-based biomaterials for rebuilding oral and craniofacial tissues in the future.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00120-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4268465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-06DOI: 10.1186/s42825-023-00121-x
Collagen and Leather
{"title":"Correction to Competing Interests","authors":"Collagen and Leather","doi":"10.1186/s42825-023-00121-x","DOIUrl":"10.1186/s42825-023-00121-x","url":null,"abstract":"","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00121-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4268504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.1186/s42825-023-00119-5
Linping Yan, Jibo Zhou, Hao Li, Rui Zhong, Junxin Zhuang, Xiaohui Xu, Yaping Wang, Xuepin Liao, Bi Shi
Effective protection against X-ray is the premise of utilizing the X-ray, thus it is critical to develop novel X-ray shielding materials with both low density and high X-ray attenuation efficiency. As the even distribution of high-Z element components is of great significance for increasing the attenuation efficiency of X-ray shielding materials, in this study, the microfiber membrane (MFM), a type of synthetic leather featuring hierarchical structure was chosen to provide large surface area for the dispersion of rare earth (RE) element. Meanwhile, plant polyphenol was utilized to achieve the stable loading and uniform dispersion of the Ce or Er into MFM. Benefiting from the assistance of polyphenol and hierarchical structure of MFM, the even dispersion of RE element was successfully realized. The resultant shielding materials displayed approximately 10% superior X-ray attenuation efficiency compared to that without polyphenol, and an averagely 9% increment in X-ray attenuation efficiency than that without hierarchical structure. Moreover, the obtained composite with a thickness of 2.8 mm displayed superior X-ray shielding performance compared to 0.25 mm lead sheet in 16–83 keV and retained an ultralow density of 1.4 g cm–3. Our research results would shed new light on the manufacture of high-performance X-ray shielding materials with excellent X-ray shielding performance.
Graphical Abstract
有效防护x射线是利用x射线的前提，因此开发低密度、高x射线衰减效率的新型x射线屏蔽材料至关重要。由于高z元素组分的均匀分布对提高x射线屏蔽材料的衰减效率具有重要意义，因此本研究选择了一种具有分层结构的合成革——超纤维膜(MFM)，为稀土(RE)元素的分散提供了较大的表面积。同时，利用植物多酚实现了Ce或Er在MFM中的稳定加载和均匀分散。利用多酚的辅助和MFM的层次化结构，成功地实现了稀土元素的均匀分散。所得屏蔽材料的x射线衰减效率比不含多酚的材料高约10%，比不含分层结构的材料平均提高9%。此外，与0.25 mm铅板相比，2.8 mm厚度的复合材料在16-83 keV下具有更好的x射线屏蔽性能，并保持了1.4 g cm-3的超低密度。我们的研究成果将为研制具有优异x射线屏蔽性能的高性能x射线屏蔽材料提供新的思路。图形抽象
{"title":"Wearable synthetic leather-based high-performance X-ray shielding materials enabled by the plant polyphenol- and hierarchical structure-facilitated dispersion","authors":"Linping Yan, Jibo Zhou, Hao Li, Rui Zhong, Junxin Zhuang, Xiaohui Xu, Yaping Wang, Xuepin Liao, Bi Shi","doi":"10.1186/s42825-023-00119-5","DOIUrl":"10.1186/s42825-023-00119-5","url":null,"abstract":"<div><p>Effective protection against X-ray is the premise of utilizing the X-ray, thus it is critical to develop novel X-ray shielding materials with both low density and high X-ray attenuation efficiency. As the even distribution of high-Z element components is of great significance for increasing the attenuation efficiency of X-ray shielding materials, in this study, the microfiber membrane (MFM), a type of synthetic leather featuring hierarchical structure was chosen to provide large surface area for the dispersion of rare earth (RE) element. Meanwhile, plant polyphenol was utilized to achieve the stable loading and uniform dispersion of the Ce or Er into MFM. Benefiting from the assistance of polyphenol and hierarchical structure of MFM, the even dispersion of RE element was successfully realized. The resultant shielding materials displayed approximately 10% superior X-ray attenuation efficiency compared to that without polyphenol, and an averagely 9% increment in X-ray attenuation efficiency than that without hierarchical structure. Moreover, the obtained composite with a thickness of 2.8 mm displayed superior X-ray shielding performance compared to 0.25 mm lead sheet in 16–83 keV and retained an ultralow density of 1.4 g cm<sup>–3</sup>. Our research results would shed new light on the manufacture of high-performance X-ray shielding materials with excellent X-ray shielding performance.\u0000</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00119-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4815189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-13DOI: 10.1186/s42825-023-00118-6
Simiao Yin, Yuanzhi Zhang, Xiaoxia Zhang, Keyu Tao, Guoying Li
This study developed an active and intelligent collagen-based packaging film with high strength for visually monitoring the freshness of fish. The results of scanning electron microscopy and atomic force microscopy showed that the film based on cross-linked collagen/delphinidin catalyzed by laccase exhibited a denser layer structure and a rougher surface. The dry and wet tensile strengths of the laccase-catalyzed collagen/delphinidin film (Col/Dp-LA film) increased by 41.74 MPa and 13.13 MPa in comparison with that of the pure collagen film, respectively. Moreover, the Col/Dp-LA film presented good antioxidant and barrier properties demonstrated by the results of free radical scavenging rate, light transmission rate, and water vapor permeability. The intelligent collagen-based film was obtained by incorporating Vaccinium oxycoccus pigment into the Col/Dp-LA film, which could change color under different pH values. When applied to the preservation of fish fillets, the film could release Dp to minimize oxidative rancidity and prolong the shelf life of the fish for 2 days. Meanwhile, the film showed visual color changes from purplish-red to greyish-blue after the fish spoilage. These results indicated that the collagen film treated with delphinidin, laccase, and Vaccinium oxycoccus pigment has potential application value in the field of active and intelligent food packaging.
{"title":"High-strength collagen/delphinidin film incorporated with Vaccinium oxycoccus pigment for active and intelligent food packaging","authors":"Simiao Yin, Yuanzhi Zhang, Xiaoxia Zhang, Keyu Tao, Guoying Li","doi":"10.1186/s42825-023-00118-6","DOIUrl":"10.1186/s42825-023-00118-6","url":null,"abstract":"<div><p>This study developed an active and intelligent collagen-based packaging film with high strength for visually monitoring the freshness of fish. The results of scanning electron microscopy and atomic force microscopy showed that the film based on cross-linked collagen/delphinidin catalyzed by laccase exhibited a denser layer structure and a rougher surface. The dry and wet tensile strengths of the laccase-catalyzed collagen/delphinidin film (Col/Dp-LA film) increased by 41.74 MPa and 13.13 MPa in comparison with that of the pure collagen film, respectively. Moreover, the Col/Dp-LA film presented good antioxidant and barrier properties demonstrated by the results of free radical scavenging rate, light transmission rate, and water vapor permeability. The intelligent collagen-based film was obtained by incorporating <i>Vaccinium oxycoccus</i> pigment into the Col/Dp-LA film, which could change color under different pH values. When applied to the preservation of fish fillets<i>,</i> the film could release Dp to minimize oxidative rancidity and prolong the shelf life of the fish for 2 days. Meanwhile, the film showed visual color changes from purplish-red to greyish-blue after the fish spoilage. These results indicated that the collagen film treated with delphinidin, laccase, and <i>Vaccinium oxycoccus</i> pigment has potential application value in the field of active and intelligent food packaging.\u0000</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00118-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4817357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Enzymes have been widely used as alternatives to conventional chemicals in cleaner leather processes due to their advantages of meeting increasing environmental demands. Especially, enzymatic unhairing based on protease has been applied to leather-making for a long time, however, it still has the key problem of slow permeation in the animal hide, resulting in slow unhairing rate, poor hair removal effect, excessive proteolysis of hide collagen, and decreased leather quality. Aiming at the key problem of bio-unhairing technology, fluorescent labeling technique and confocal laser scanning microscopy were used to investigate the protease permeation behaviors into the animal hide based on well-prepared labeled proteases, as well as the quantitative analysis of the protease amount in different hide layers. The results show that the protease mainly permeates the bovine hide through transfollicular routes from the hair side, and although the intercellular-interfibrillar pathway also exists, it does not play an important role. Additionally, the protease permeation behaviors into the hide are greatly impacted by the charge states of the hide and protease proteins, depending on the isoelectric points (pI) of the proteins and solution pH values. When the solution pH is not between the pI values of the two proteins, the similarly charged protease can quickly and deeply penetrate the hide because of the electrostatic repulsion. The established mechanism provides a theoretical basis for developing an efficient enzymatic unhairing technology for leather-making, and this can also be applied to other processes involving the enzyme permeation into the hide or leather.
{"title":"Key mechanism of enzymatic dehairing technology for leather-making: permeation behaviors of protease into animal hide and the mechanism of charge regulation","authors":"Mengchu Gao, Jinzhi Song, Xu Zhang, Chunxiao Zhang, Biyu Peng, Sadaqat Ali Chattha","doi":"10.1186/s42825-023-00117-7","DOIUrl":"10.1186/s42825-023-00117-7","url":null,"abstract":"<div><p>Enzymes have been widely used as alternatives to conventional chemicals in cleaner leather processes due to their advantages of meeting increasing environmental demands. Especially, enzymatic unhairing based on protease has been applied to leather-making for a long time, however, it still has the key problem of slow permeation in the animal hide, resulting in slow unhairing rate, poor hair removal effect, excessive proteolysis of hide collagen, and decreased leather quality. Aiming at the key problem of bio-unhairing technology, fluorescent labeling technique and confocal laser scanning microscopy were used to investigate the protease permeation behaviors into the animal hide based on well-prepared labeled proteases, as well as the quantitative analysis of the protease amount in different hide layers. The results show that the protease mainly permeates the bovine hide through transfollicular routes from the hair side, and although the intercellular-interfibrillar pathway also exists, it does not play an important role. Additionally, the protease permeation behaviors into the hide are greatly impacted by the charge states of the hide and protease proteins, depending on the isoelectric points (pI) of the proteins and solution pH values. When the solution pH is not between the pI values of the two proteins, the similarly charged protease can quickly and deeply penetrate the hide because of the electrostatic repulsion. The established mechanism provides a theoretical basis for developing an efficient enzymatic unhairing technology for leather-making, and this can also be applied to other processes involving the enzyme permeation into the hide or leather.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":640,"journal":{"name":"Journal of Leather Science and Engineering","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://JLSE.SpringerOpen.com/counter/pdf/10.1186/s42825-023-00117-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4654713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号