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Extraction of a novel tanning agent from indigenous plant bark and its application in leather processing

Journal of Leather Science and Engineering 2022年第1期4卷 253-267页

作者： Raju Kumar Das Al Mizan Fatema Tuj Zohra Sobur Ahmed Khondoker Shahin Ahmed hemayet hossain Institute of Leather Engineering and Technology(ILET) University of Dhaka44-50HazaribaghDhaka 1209Bangladesh Department of Leather Engineering Khulna University of Engineering&Technology(KUET)Khulna 9203Bangladesh Department of Leather Engineering Faculty of EngineeringEge University35100 BornovaIzmirTurkey BCSIR Laboratories Chemical Research DivisionBangladesh Council of Scientific and Industrial Research(BCSIR)DhanmondiDhaka 1205Bangladesh

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 veg-etable 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 Xylocar-pus 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.

关键词： Vegetable tanning agent Strength properties Shrinkage temperature Chrome-free leather Alternative tannin Xylocarpus granatum

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Anti-inflammatory and antioxidant activities of ethanolic extract of aerial parts of Vernonia patula(Dryand.)Merr.

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Asian Pacific Journal of Tropical Biomedicine 2013年第10期3卷 798-805页

作者： Arpona Hira Shubhra Kanti Dey Md.Sariful Islam Howlader Arif Ahmed hemayet hossain Ismet Ara Jahan Pharmacy Discipline.Life Science School Khulna UniversityKhulna-9208Bangladesh Department of Pharmacy World University of BangladeshDhaka-1205Bangladesh BCSIR Laboratories.Dhaka.Bangladesh Council of Scientific and Industrial Research.Dr.Qudrat-E-Khuda Road Dhaka-1205Bangladesh

Objective:To investigate the inflammatory and antioxidant activities of ethanolie extract of aerial part of Vernonia patula(Dryand.)Merr(EAV).Methods:The anti-inflammatory activity of EAV was studied using carrageenan and histamine-induced rat paw edema test at different doses(100.200 and 400 mg/kg body weight).DPPH free radical scavenging,nitric oxide scavenging,reducing power and Fe^(2+)ion chelating ability were used for determining antioxidant ***:The EAV,at the dose of 400 mg/kg,showed a significant anti-inflammatory activity(P<0.01)both in the carrageenan and histamine-induced oedema test models in rats,showing62.86%and 64.42%reduction in the paw volume comparable to that produced by the standard drug indomethacin(67.26%and 66.01%)at 5 h *** DPPH free radical scavenging test,IC_(50)value for EAV was found fairly significant 36.59μg/mL when compared to the IC_(50)value of the reference standards ascorbic acid 8.97μg/*** IC_(50)values of the extract and ascorbic acid were 47.72 and 12.39μg/mL,respectively in nitric oxide scavenging *** IC_(50)value of the EAV(33.59μg/mL)as percentage of Fe^(2+)ion chelating ability was also found significant compared to that of EDTA(9.16μg/mL).The maximum absorbance for reducing power assay was found to be1.928 at 100μg/mL when compared to 2.449 for standard ascorbic *** total phenolic content was 198.81 mg/g of gallic acid *** toxicity test showed that the plant might be safe for pharmacological uses up to a dose level of 3200 mg/kg of body weight in ***:Therefore,the obtained results suggest the acute anti-inflammatory and antioxidant activities of the EAV and thus provide the scientific basis for the traditional uses of this plant part as a remedy for inflammations.

关键词： Vernonia patula Anti-inflammatory DPPH free-radical scavenging Nitric oxide radical scavenging Reducing power Acute toxicity

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孟加拉国独立后的达卡陶艺

孟加拉国独立后的达卡陶艺

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作者： Mohammad hemayet hossain Jewel（好景）中国美术学院

学位级别：硕士

“达卡陶艺”的概念是在孟加拉国独立后提出的。本文以孟加拉国独立后达卡陶艺的历史为重点,主要围绕达卡陶艺作品日二巴扎(RayerBazar)的传统陶艺、达卡日二巴扎(RayerBazar)的艺术作品与传统的陶艺创作、达卡地区的陶瓷艺术之旅、初期... 详细信息

“达卡陶艺”的概念是在孟加拉国独立后提出的。本文以孟加拉国独立后达卡陶艺的历史为重点,主要围绕达卡陶艺作品日二巴扎(RayerBazar)的传统陶艺、达卡日二巴扎(RayerBazar)的艺术作品与传统的陶艺创作、达卡地区的陶瓷艺术之旅、初期-草创期,中期-发展期,晚期-成熟期、技术以及陶瓷艺术品的美学与艺术家的社会价值展开。本文的研究主要集中在孟加拉国独立后之后的时期,且现代陶艺之旅始于1961年的达卡大学艺术学院陶瓷系。本文同时会简要的论及孟加拉国的达卡第一艺术学院和达卡的陶艺家。本文中所提及的艺术家均对达卡的陶瓷艺术有着重要的影响。

关键词：孟加拉国达卡陶艺陶艺家

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