A 2D full cell thermo-electric model of 160kA drained cell was set up using finiteelement code to calculate its freeze profile, then the drained cell model was modifiedaccording to the freeze profile computed and its ...A 2D full cell thermo-electric model of 160kA drained cell was set up using finiteelement code to calculate its freeze profile, then the drained cell model was modifiedaccording to the freeze profile computed and its heat balance was calculated. Comparedwith that of a 160kA conventional Hall-Heroult cell (H-H cell), though the melts vol-ume of the drained cell reduced greatly, the whole heat loss from it didn't drop downapparently, and an analysis was presented in the paper. On the other hand, the anode-cathode distance (ACD) of a drained cell was much less than that of a H-H cell, sothe voltage drop on it and heat produced decreased too, steps should be taken to keepa workable heat balance on a drained cell.展开更多
To thoroughly understand market opportunity of freeze-dried facial mask and deeply get insight of consumers’usage behavior and needs,evaluate sensory feelings of 10 screened commercial freeze-dried facial mask produc...To thoroughly understand market opportunity of freeze-dried facial mask and deeply get insight of consumers’usage behavior and needs,evaluate sensory feelings of 10 screened commercial freeze-dried facial mask products,group test products according to the differences of sensory attributions via Principal Component Analysis(PCA)and Agglomerative Hierarchical Clustering(AHC),pick up the representative products.Freeze-dried facial mask users evaluate satisfaction degree of picked up products and participate survey of usage behavior/cognition.Analyze consumer data by AHC to get consumer segmentations and their profile.The test results show that,sensory data and consumer data,which is from consumers test of screened representative products by performing PCA and AHC on sensory data,can be verified mutually.It is helpful to understand the needs of consumer segmentations and reason to buy by combining sensory data and consumer test.展开更多
无花果是一种药食两用的水果,具有重要的经济价值。实验对比分析了真空干燥和冷冻干燥对无花果酚类成分及其抗氧化活性的影响。利用福林酚法测定总酚含量,DPPH和ABTS法检测多酚抗氧化活性,同时采用液质联用技术(UPLC-QqQ-MS/MS)对无花...无花果是一种药食两用的水果,具有重要的经济价值。实验对比分析了真空干燥和冷冻干燥对无花果酚类成分及其抗氧化活性的影响。利用福林酚法测定总酚含量,DPPH和ABTS法检测多酚抗氧化活性,同时采用液质联用技术(UPLC-QqQ-MS/MS)对无花果干燥前后含有的多酚成分进行准确的定性定量分析。结果表明,2种干燥方式对无花果酚类成分及抗氧化活性影响有显著差异,真空干燥和冷冻干燥后无花果总酚含量、DPPH自由基及ABTS自由基清除能力分别是388.65 mg GAE/100 g d.b.、162.25 mg Vc/100 g d.b.、333.08 mg Vc/100 g d.b.和285.71 mg GAE/100 g d.b.、144.44 mg Vc/100 g d.b.、337.76 mg Vc/100 g d.b.。液质分析发现无花果中的主要酚酸是没食子酸和绿原酸,主要类黄酮是芦丁。2种干燥处理均破坏无花果中的多酚成分及其抗氧化活性。但与冷冻干燥相比,真空干燥能够减少无花果中酚类成分及其抗氧化能力的损失。展开更多
The processing of Morinda citrifolia fruit normally results in a large number of waste leaves that hold many bioactive compounds with nutritional and pharmacological properties.This work aimed to evaluate the effects ...The processing of Morinda citrifolia fruit normally results in a large number of waste leaves that hold many bioactive compounds with nutritional and pharmacological properties.This work aimed to evaluate the effects of a multi-stage block freeze concentration(BFC)via gravitational method on the physicochemical properties of the leaf extract(noni tea).The results in solid retention showed fractions almost 7 times most concentrated than the initial feed.In addition,when compared to the initial content,the BFC process showed an efficiency higher than 90%in the retention of phenolic compounds.Assays in liquid chromatography allowed the detection and quantification of phenolic compounds,in which the total amount increased by more than 1000%in relation to the initial content after each BFC step.Finally,it was also possible to observe a significant increase in the antioxidant activity of the concentrated product after the simulated in vitro digestion process.It was concluded that using a non-thermal,sustainable,low-cost processing,promoted the obtaining of concentrated fractions with high biological and nutritional values with promising properties for application in the development of functional foods from agroindustrial wastes.展开更多
基金supported by the National Key Fundamental Research&Development Project of China(No.G1999064903).
文摘A 2D full cell thermo-electric model of 160kA drained cell was set up using finiteelement code to calculate its freeze profile, then the drained cell model was modifiedaccording to the freeze profile computed and its heat balance was calculated. Comparedwith that of a 160kA conventional Hall-Heroult cell (H-H cell), though the melts vol-ume of the drained cell reduced greatly, the whole heat loss from it didn't drop downapparently, and an analysis was presented in the paper. On the other hand, the anode-cathode distance (ACD) of a drained cell was much less than that of a H-H cell, sothe voltage drop on it and heat produced decreased too, steps should be taken to keepa workable heat balance on a drained cell.
文摘To thoroughly understand market opportunity of freeze-dried facial mask and deeply get insight of consumers’usage behavior and needs,evaluate sensory feelings of 10 screened commercial freeze-dried facial mask products,group test products according to the differences of sensory attributions via Principal Component Analysis(PCA)and Agglomerative Hierarchical Clustering(AHC),pick up the representative products.Freeze-dried facial mask users evaluate satisfaction degree of picked up products and participate survey of usage behavior/cognition.Analyze consumer data by AHC to get consumer segmentations and their profile.The test results show that,sensory data and consumer data,which is from consumers test of screened representative products by performing PCA and AHC on sensory data,can be verified mutually.It is helpful to understand the needs of consumer segmentations and reason to buy by combining sensory data and consumer test.
文摘无花果是一种药食两用的水果,具有重要的经济价值。实验对比分析了真空干燥和冷冻干燥对无花果酚类成分及其抗氧化活性的影响。利用福林酚法测定总酚含量,DPPH和ABTS法检测多酚抗氧化活性,同时采用液质联用技术(UPLC-QqQ-MS/MS)对无花果干燥前后含有的多酚成分进行准确的定性定量分析。结果表明,2种干燥方式对无花果酚类成分及抗氧化活性影响有显著差异,真空干燥和冷冻干燥后无花果总酚含量、DPPH自由基及ABTS自由基清除能力分别是388.65 mg GAE/100 g d.b.、162.25 mg Vc/100 g d.b.、333.08 mg Vc/100 g d.b.和285.71 mg GAE/100 g d.b.、144.44 mg Vc/100 g d.b.、337.76 mg Vc/100 g d.b.。液质分析发现无花果中的主要酚酸是没食子酸和绿原酸,主要类黄酮是芦丁。2种干燥处理均破坏无花果中的多酚成分及其抗氧化活性。但与冷冻干燥相比,真空干燥能够减少无花果中酚类成分及其抗氧化能力的损失。
基金support of CNPq(National Council of Scientific and Technological Development,Brazil)and FAPESC(Santa Catarina State Research and Innovation Support,Brazil)project number:03/2017to CAPES-PRINT,Project numbers 88887.310560/2018-00 and 88887.310373/2018-00.
文摘The processing of Morinda citrifolia fruit normally results in a large number of waste leaves that hold many bioactive compounds with nutritional and pharmacological properties.This work aimed to evaluate the effects of a multi-stage block freeze concentration(BFC)via gravitational method on the physicochemical properties of the leaf extract(noni tea).The results in solid retention showed fractions almost 7 times most concentrated than the initial feed.In addition,when compared to the initial content,the BFC process showed an efficiency higher than 90%in the retention of phenolic compounds.Assays in liquid chromatography allowed the detection and quantification of phenolic compounds,in which the total amount increased by more than 1000%in relation to the initial content after each BFC step.Finally,it was also possible to observe a significant increase in the antioxidant activity of the concentrated product after the simulated in vitro digestion process.It was concluded that using a non-thermal,sustainable,low-cost processing,promoted the obtaining of concentrated fractions with high biological and nutritional values with promising properties for application in the development of functional foods from agroindustrial wastes.
