粉末狀食品在低水分含量狀態下的結構轉變
abstract
caking of free-flowing powders during storage is a deleterious phenomenon ubiquitous in the feed, fertilizer, detergent and pharmaceutical industries, and of economical importance to low moisture foods. among other subjects related to caking phenomena, the following aspects are reviewed in this paper: i）morphological changes occurring during caking; ii） proposed mechanisms of caking; iii） quantitative procedures to assess caking; iv） factors affecting caking kinetics; and v） mode of action of anticaking agents. however, the relationship between storage-induced caking processes and the glass transition of amorphous powders is analyzed in more detail.
water relations, glass transition temperatures, structural collapse and microstructural changes of a protein hydrolyzate sample were investigated as a function of sample degree of hydrolysis, storage conditions （temperature and relative humidity） and time. the gordon-taylor equation was a good predictor for the plasticizing effect of water on the glass transition temperature of the powder （tg）. it appeared that the difference △t between the storage temperature （t） and tg was the driving force for structural collapse. volume shrinkage, induced by viscous flow of the matrix and leading to collapse was first noticeable for at > 30°c, corresponding to a water activity> 0.4. the functional dependence between caking kinetics and at was modeled using a williams-landel-ferry （wlf） type relationship. the viscosity of the matrix at the onset of structural collapse was estimated using the wlf equation was 7 log cycles lower than the viscosity of the amorphous solid. scanning electron microscopy studies demonstrated the viscous flow nature of caking by thickening of pore walls and appearance of drop-like and semicrystalline microstructures.
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鑄鐵潛水攪拌機在水處理與污水處理中的應用
線切割機床割模具有臺階怎么辦？
管式電阻爐參數
便攜式非甲烷總烴分析儀可應對各種復雜排放工況
聚四氟乙烯的耐熱溫度？
粉末狀食品在低水分含量狀態下的結構轉變
二氧化碳培養箱的相關介紹
數控車床CAK80285多少錢與80285車床的開環控制有關
手持式激光焊接機-切割焊接清洗一體機
刮屑板-根據客戶需要百變的機床零配件
Q684F氣動衛生級T型L型三通球閥Q685F的產品特點
生豬車輛洗消中心清洗介紹
phaseII費思圖PTG-3500涂層測厚儀應用領域及介紹
華為和德國杜伊斯堡市合作 打造西歐模范智慧城市
PLC-RSC-230UC/ 1AU/SEN/SO46 - 繼電器模塊 1125984 技術資料
pir保冷管托廠
淺析電伴熱技術在隧道消防電伴熱中的應用
出去吃飯要留心，某地通報26批次不合格餐飲具！大腸菌群檢測儀
換水泵密封及換機械密封的方法
MBR一體化污水處理設備使用說明
caking of free-flowing powders during storage is a deleterious phenomenon ubiquitous in the feed, fertilizer, detergent and pharmaceutical industries, and of economical importance to low moisture foods. among other subjects related to caking phenomena, the following aspects are reviewed in this paper: i）morphological changes occurring during caking; ii） proposed mechanisms of caking; iii） quantitative procedures to assess caking; iv） factors affecting caking kinetics; and v） mode of action of anticaking agents. however, the relationship between storage-induced caking processes and the glass transition of amorphous powders is analyzed in more detail.
water relations, glass transition temperatures, structural collapse and microstructural changes of a protein hydrolyzate sample were investigated as a function of sample degree of hydrolysis, storage conditions （temperature and relative humidity） and time. the gordon-taylor equation was a good predictor for the plasticizing effect of water on the glass transition temperature of the powder （tg）. it appeared that the difference △t between the storage temperature （t） and tg was the driving force for structural collapse. volume shrinkage, induced by viscous flow of the matrix and leading to collapse was first noticeable for at > 30°c, corresponding to a water activity> 0.4. the functional dependence between caking kinetics and at was modeled using a williams-landel-ferry （wlf） type relationship. the viscosity of the matrix at the onset of structural collapse was estimated using the wlf equation was 7 log cycles lower than the viscosity of the amorphous solid. scanning electron microscopy studies demonstrated the viscous flow nature of caking by thickening of pore walls and appearance of drop-like and semicrystalline microstructures.
更多詳情，請培安公司：
：北京： 上海： 成都： 廣州：
: ：
鑄鐵潛水攪拌機在水處理與污水處理中的應用
線切割機床割模具有臺階怎么辦？
管式電阻爐參數
便攜式非甲烷總烴分析儀可應對各種復雜排放工況
聚四氟乙烯的耐熱溫度？
粉末狀食品在低水分含量狀態下的結構轉變
二氧化碳培養箱的相關介紹
數控車床CAK80285多少錢與80285車床的開環控制有關
手持式激光焊接機-切割焊接清洗一體機
刮屑板-根據客戶需要百變的機床零配件
Q684F氣動衛生級T型L型三通球閥Q685F的產品特點
生豬車輛洗消中心清洗介紹
phaseII費思圖PTG-3500涂層測厚儀應用領域及介紹
華為和德國杜伊斯堡市合作 打造西歐模范智慧城市
PLC-RSC-230UC/ 1AU/SEN/SO46 - 繼電器模塊 1125984 技術資料
pir保冷管托廠
淺析電伴熱技術在隧道消防電伴熱中的應用
出去吃飯要留心，某地通報26批次不合格餐飲具！大腸菌群檢測儀
換水泵密封及換機械密封的方法
MBR一體化污水處理設備使用說明