The application and mechanism study of microwave irradiation in traditional industries have attracted considerable attention owing to the unique thermal and athermal effects that could lead to unexpected benefits in h...The application and mechanism study of microwave irradiation in traditional industries have attracted considerable attention owing to the unique thermal and athermal effects that could lead to unexpected benefits in high-efficiency and clean production.Herein,we report the investigation of the aluminum tanning under microwave irradiation upon using hide powder and skin pieces,respectively,as simulants of real hide or skin.The aluminum tanning process and the tanned products under microwave heating(MWH)were studied and compared with those of conventional water bath heating(WBH)as the controls.For the tanning system of hide powder,the tanning effluents were analyzed in terms of pH,conductivity,dielectric constant and aluminum content,and the tanned powder was investigated by differential scanning calorimetry(DSC),thermogravimetric(TG)analysis,and FT-IR spectroscopy.For the skin piece system,the pH and aluminum content of tanning effluents were also determined,and at the same time,DSC,TG,SEM,FT-IR and shrinkage temperature were used to illustrate the actions of microwaves on the structure and properties of the tanned pieces.The results show that aluminum reactivity in the penetration and binding process of collagen fibers in hide powder and skin pieces improved using microwave treatment.The residual aluminum content was greatly reduced by microwave heating action,and the increased amount of aluminum with evener distribution was observed in the tanned products.Microwave irradiation also resulted in the tanned products with better thermal stability and thermal decomposition resistance.This work further promotes application of microwave treatments for aluminumbased tanning in leather industry.展开更多
以活性染料Remazol brilliant blue R(RBB)对皮粉进行染色,制备了在较宽的pH范围内稳定的热变性染色皮粉。研究了反应时间、底物和蛋白酶浓度等因素对酶催化染色皮粉水解速度的影响,建立了一种基于变性皮粉-RBB底物的蛋白酶活力检测方...以活性染料Remazol brilliant blue R(RBB)对皮粉进行染色,制备了在较宽的pH范围内稳定的热变性染色皮粉。研究了反应时间、底物和蛋白酶浓度等因素对酶催化染色皮粉水解速度的影响,建立了一种基于变性皮粉-RBB底物的蛋白酶活力检测方法。用建立的方法,对几种常用的制革蛋白酶进行酶活力测定,并与常用的基于酪素底物的福林法和LVU法进行对比,结果表明:对于大部分蛋白酶,2种底物检测结果有较大差异。展开更多
基金Financial support from the National Natural Science Foundation(No.21576171)the Science&Technology Department of Sichuan Province(No.2018HH0038)is gratefully acknowledgedfunded by the Innovation Training Program for college students of Sichuan University(C2020107809).
文摘The application and mechanism study of microwave irradiation in traditional industries have attracted considerable attention owing to the unique thermal and athermal effects that could lead to unexpected benefits in high-efficiency and clean production.Herein,we report the investigation of the aluminum tanning under microwave irradiation upon using hide powder and skin pieces,respectively,as simulants of real hide or skin.The aluminum tanning process and the tanned products under microwave heating(MWH)were studied and compared with those of conventional water bath heating(WBH)as the controls.For the tanning system of hide powder,the tanning effluents were analyzed in terms of pH,conductivity,dielectric constant and aluminum content,and the tanned powder was investigated by differential scanning calorimetry(DSC),thermogravimetric(TG)analysis,and FT-IR spectroscopy.For the skin piece system,the pH and aluminum content of tanning effluents were also determined,and at the same time,DSC,TG,SEM,FT-IR and shrinkage temperature were used to illustrate the actions of microwaves on the structure and properties of the tanned pieces.The results show that aluminum reactivity in the penetration and binding process of collagen fibers in hide powder and skin pieces improved using microwave treatment.The residual aluminum content was greatly reduced by microwave heating action,and the increased amount of aluminum with evener distribution was observed in the tanned products.Microwave irradiation also resulted in the tanned products with better thermal stability and thermal decomposition resistance.This work further promotes application of microwave treatments for aluminumbased tanning in leather industry.
文摘以活性染料Remazol brilliant blue R(RBB)对皮粉进行染色,制备了在较宽的pH范围内稳定的热变性染色皮粉。研究了反应时间、底物和蛋白酶浓度等因素对酶催化染色皮粉水解速度的影响,建立了一种基于变性皮粉-RBB底物的蛋白酶活力检测方法。用建立的方法,对几种常用的制革蛋白酶进行酶活力测定,并与常用的基于酪素底物的福林法和LVU法进行对比,结果表明:对于大部分蛋白酶,2种底物检测结果有较大差异。
