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Screening of additives to reduce grain damage risk on unhairing by proteinase K

Journal of Leather Science and Engineering 2020年第1期2卷 196-204页

作者： Mei Chen Mingfang Jiang He Li Haiming Cheng Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China Chengdu Technological University Chengdu 611730China National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065China

Enzymatic unhairing is a cleaner strategy for *** is a potential alternative to the traditional hairburning ***,several shortcomings,such as uncontrolled enzymatic reaction,and risk of grain looseness and damage have restricted the broad application of enzymatic *** this work,metal ions and organic additives were screened for lessening the hydrolytic activity of proteinase K to collagen ***,the selected additives were applied to the enzymatic unhairing process for bovine *** results showed that a suitable concentration of metal ions(Cu(Ⅱ),Fe(Ⅲ)and Al(Ⅲ))and organic additives(salicylate,laurate,adipate,gallate and epicatechin(ECG))could diminish approximately 35% of the hydrolytic activity of proteinase K to collagen ***,the additives were applied for the bovine hide enzymatic unhairing *** determination in the unhairing float shows that applying additives could reduce collagen *** morphology results showed that the grain damage could be significantly reduced with the addition of the screened additives in the proteinase K enzymatic unhairing system,whereas the addition of ECG and gallate significantly slowed down the unhairing *** outcome provides new potential to reduce the risk of grain damage in enzymatic unhairing process.

关键词： Enzymatic unhairing grain damage Proteinase K Inhibitor Leather making

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grain dehydration rate is related to post-silking thermal time and ear characters in different maize hybrids

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Journal of Integrative Agriculture 2022年第4期21卷 964-976页

作者： SHI Wen-jun SHAO Hui SHA Ye SHI Rong SHI Dong-feng CHEN Ya-chao BAN Xiang-ben MI Guo-hua The Key Lab of Plant–Soil Interaction Ministry of Education/National Academy of Agriculture Green Development/College of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193P.R.China

Mechanized grain harvest of maize becomes increasingly important with growing land plot size in Northeast China. grain moisture is an important factor affecting the performance of mechanized grain harvest. However, it remains unclear what influences grain dehydration rate. In this study, maize grain dehydrating process was investigated in a two-year field experiment with five hybrids under two planting densities in 2017 and 2018. It was found that damaged-grain ratio was the main factor affecting mechanized harvest quality, and this ratio was positively correlated with grain moisture content at harvest(R^(2)=0.6372, Pdamaged-grain ratio for mechanized grain harvest, the optimal maize grain moisture content was 22.3%. From silking to physiological maturity, grain dehydrating process was mostly dependent on the thermal time(growing degree days, GDDs)(r=-0.9412, Pgrain moisture content at physiological maturity was 29.4%. Thereafter, the linear relationship between GDDs and grain moisture still existed, but the correlation coefficient became smaller(r=-0.8267, Pgrain dehydrating process was greatly affected by genotypes. grain dehydrated faster when a hybrid has a smaller husk area(r=0.6591, Pgrain harvest.

关键词： maize grain moisture grain dehydrating grain damage mechanized harvest ear traits genotype

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