目的基于高精度3D打印技术研究三文鱼植物基替代物。方法以豌豆分离蛋白(pea protein isolate,PPI)、魔芋胶(konjac gum,KGM)和天然胡萝卜粉为原辅料,进行精准3D复合打印生产模拟三文鱼色泽、质构的植物基替代物。考察不同物料比例对油...目的基于高精度3D打印技术研究三文鱼植物基替代物。方法以豌豆分离蛋白(pea protein isolate,PPI)、魔芋胶(konjac gum,KGM)和天然胡萝卜粉为原辅料,进行精准3D复合打印生产模拟三文鱼色泽、质构的植物基替代物。考察不同物料比例对油墨可打印性的影响;选取有代表性的油墨配方,对其流变特性、水分分布情况、微观结构进行表征。结果PPI和KGM浓度的升高都增强了体系与水结合的能力,且PPI浓度过高时(20%,m:m)影响了KGM与水结合形成稳定凝胶的能力。PPI15KGM5配方可形成致密的网格结构,增强了体系的稳定性,拥有良好的剪切恢复特性,有利于3D打印;而PPI20KGM3配方具有更好的机械性能和结构强度,但是由于PPI浓度过高影响KGM形成稳定凝胶结构,其剪切恢复特性较差。流变学参数η、τ_(y)、G'、屈服应变及剪切恢复特性对油墨3D打印过程影响显著。结论通过调整3D打印精细化程度(350µm和500µm)和模型填充度,生产了具有差异化质构的高蛋白含量(15%,m:m)产品。其中,部分产品的粘性和弹性与真实三文鱼类似,这为开发3D打印生产植物基替代物提供了新的视角。展开更多
Antibacterial effect of cinnamon oil combined with thyme or clove oil was studied in this paper. Agar dilution method was used to determine the minimum inhibitory concentrations （MICs） of the essential oils （EOs） ...Antibacterial effect of cinnamon oil combined with thyme or clove oil was studied in this paper. Agar dilution method was used to determine the minimum inhibitory concentrations （MICs） of the essential oils （EOs） of cinnamon, thyme, and clove oil against three Gram-positive bacteria （Bacillus subtilis, Bacillus cereus, and Staphylococcus aureus）, and two Gramnegative bacteria （Escherichia coli and Salmonella typhimurium）. The results showed that cinnamon was a promising antibacterial substance with MIC ranged from 0.1 to 0.4 μL mL^-1 for the five bacterial species. Agar dilution checkerboard method was used to test the combined antibacterial effect of cinnamon oil with thyme or clove oil. Combination of cinnamon and thyme oil showed an additive effect against all selected bacteria, and combination of cinnamon and clove oil displayed an additive effect against B. subtilis, B. cereus, S. aureus, and an indifferent effect against E. coli and S. typhimurium. Furthermore, gas chromatography-mass spectrometry （GC-MS） measurement was used to analyze the components of the EOs, and the main components of cinnamon, thyme, and clove were cinnamaldehyde, thymol, carvacrol and p-cymene, and eugenol, respectively.展开更多
aquatic product, known as one of the good resources for white meat, has been widely accepted by the consumers due to its high protein, low fat, especially low cholesterol. With the fast development of living standards...aquatic product, known as one of the good resources for white meat, has been widely accepted by the consumers due to its high protein, low fat, especially low cholesterol. With the fast development of living standards around the world, the consumer demands for high quality, nutrition, safety and freshness of ifshery food are increasing. Thus, high efifcient preservation technologies for aquatic products become particularly important. Superchilling is one of the controlled-temperature preservation technologies for seafood. Aquatic products can be kept in better quality under superchilling conditions. This review introduced the principle and development of superchilling process, mainly focusing on research progresses and technical dififculties of superchilling. The growth mechanism of ice crystals and the feasibility of application of computational lfuid dynamics in analyzing the temperatures variation and ice crystals during superchilling progress were also discussed, which will provide theoretical foundation for its improvement and application.展开更多
文摘目的基于高精度3D打印技术研究三文鱼植物基替代物。方法以豌豆分离蛋白(pea protein isolate,PPI)、魔芋胶(konjac gum,KGM)和天然胡萝卜粉为原辅料,进行精准3D复合打印生产模拟三文鱼色泽、质构的植物基替代物。考察不同物料比例对油墨可打印性的影响;选取有代表性的油墨配方,对其流变特性、水分分布情况、微观结构进行表征。结果PPI和KGM浓度的升高都增强了体系与水结合的能力,且PPI浓度过高时(20%,m:m)影响了KGM与水结合形成稳定凝胶的能力。PPI15KGM5配方可形成致密的网格结构,增强了体系的稳定性,拥有良好的剪切恢复特性,有利于3D打印;而PPI20KGM3配方具有更好的机械性能和结构强度,但是由于PPI浓度过高影响KGM形成稳定凝胶结构,其剪切恢复特性较差。流变学参数η、τ_(y)、G'、屈服应变及剪切恢复特性对油墨3D打印过程影响显著。结论通过调整3D打印精细化程度(350µm和500µm)和模型填充度,生产了具有差异化质构的高蛋白含量(15%,m:m)产品。其中,部分产品的粘性和弹性与真实三文鱼类似,这为开发3D打印生产植物基替代物提供了新的视角。
基金supported by the National High-Tech R&D Program of China (863 Program)(SQ2007AA10XK140105)the Zhejiang Province Key Scientific and Technological Project, China(2006C12051)the Zhejiang Provincial Center for Disease Control and Prevention (CDC) (Hangzhou,China)
文摘Antibacterial effect of cinnamon oil combined with thyme or clove oil was studied in this paper. Agar dilution method was used to determine the minimum inhibitory concentrations （MICs） of the essential oils （EOs） of cinnamon, thyme, and clove oil against three Gram-positive bacteria （Bacillus subtilis, Bacillus cereus, and Staphylococcus aureus）, and two Gramnegative bacteria （Escherichia coli and Salmonella typhimurium）. The results showed that cinnamon was a promising antibacterial substance with MIC ranged from 0.1 to 0.4 μL mL^-1 for the five bacterial species. Agar dilution checkerboard method was used to test the combined antibacterial effect of cinnamon oil with thyme or clove oil. Combination of cinnamon and thyme oil showed an additive effect against all selected bacteria, and combination of cinnamon and clove oil displayed an additive effect against B. subtilis, B. cereus, S. aureus, and an indifferent effect against E. coli and S. typhimurium. Furthermore, gas chromatography-mass spectrometry （GC-MS） measurement was used to analyze the components of the EOs, and the main components of cinnamon, thyme, and clove were cinnamaldehyde, thymol, carvacrol and p-cymene, and eugenol, respectively.
基金financial support of this study from the National Key Technologies R&D Program of China during the 12th Five-Year Plan period (2012BAD38B09)the National Natural Science Foundation of China (NSFC31301417)
文摘aquatic product, known as one of the good resources for white meat, has been widely accepted by the consumers due to its high protein, low fat, especially low cholesterol. With the fast development of living standards around the world, the consumer demands for high quality, nutrition, safety and freshness of ifshery food are increasing. Thus, high efifcient preservation technologies for aquatic products become particularly important. Superchilling is one of the controlled-temperature preservation technologies for seafood. Aquatic products can be kept in better quality under superchilling conditions. This review introduced the principle and development of superchilling process, mainly focusing on research progresses and technical dififculties of superchilling. The growth mechanism of ice crystals and the feasibility of application of computational lfuid dynamics in analyzing the temperatures variation and ice crystals during superchilling progress were also discussed, which will provide theoretical foundation for its improvement and application.
