精品人体无码一区二区三区,国产99久久久国产精品~~牛,最近的2019免费中文字幕,午夜精品久久久久久久无码

資訊中心NEWS CENTER

在發(fā)展中求生存,不斷完善,以良好信譽和科學(xué)的管理促進(jìn)企業(yè)迅速發(fā)展

首頁-技術(shù)文章-粉末狀食品在低水分含量狀態(tài)下的結(jié)構(gòu)轉(zhuǎn)變

企業(yè)新聞 技術(shù)文章

粉末狀食品在低水分含量狀態(tài)下的結(jié)構(gòu)轉(zhuǎn)變

更新時間:2012-07-06       點擊次數(shù):2108

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.

 




 

更多詳情,請培安公司:
:北京: 上海: 成都: 廣州:
: sales@pynnco.comwww.pynnco.com


 

SCROLL

Copyright©2025 培安有限公司 版權(quán)所有 All Rights Reserved    備案號:京ICP備17026558號-1    總訪問量:410051

技術(shù)支持:化工儀器網(wǎng)    管理登錄    sitemap.xml

人妻少妇精品久久久久久| 国产婷婷一区二区三区| 亚洲日本无码一区二区三区四区卡 | 色欲久久久天天天综合网| 久久久久人妻精品一区三寸蜜桃| 性高湖久久久久久久久| 少妇下蹲露大唇无遮挡| 亚洲久热无码av中文字幕| 精品国产一区二区三区免费| 中文字幕日韩欧美一区二区三区| 久久精品AⅤ无码中文字字幕蜜桃| 欧美孕妇变态重口另类| 人人妻人人爽人人做夜欢视频九色| 白嫩无码人妻丰满熟妇啪啪区百度| 无码日韩精品一区二区人妻| 日韩人妻高清精品专区| 亚洲成AV人片一区二区| 免费网站观看www免费下载| 人妻 丝袜美腿 中文字幕| 色欲人妻AAAAAA无码| 久久人爽人人爽人人片AV| 精品无码久久久久久久动漫| 97se亚洲国产综合在线| 久久精品这里热有精品| 久久精品国产亚洲av麻豆网站| 日韩av无码免费播放| 日产国产精品亚洲系列| 久久人人爽人人人人爽AV| 国产精品无码一区二区av蜜桃| 无码熟妇人妻AV在线影片免费| 国产成人无码精品久久久露脸| 免费看韩国黄a片在线观看| 996久久国产精品线观看| 中文字幕人成乱码| 亚洲国产精品无码久久久老少 | 免费大片黄在线观看视频| 国产精品Ⅴ无码大片在线看| 伊人天堂av无码av日韩av| 国产在视频线精品视频| 天黑黑影院免费观看视频在线播放| 极品少妇大喷潮21p|