三级片视频播放,精品三级片在线观看,A级性爱视频,欧美+日韩+国产+无码+小说,亲子伦XX XX熟女,秋霞最新午夜伦伦A片黑狐,韩国理伦片漂亮的保拇,一边吃奶一边做边爱完整版,欧美放荡性护士videos

您好, 歡迎來到化工儀器網 登錄注冊產品展廳收藏該商鋪

培安有限公司 培安有限公司
20

010-65528800

粉末狀食品在低水分含量狀態下的結構轉變

閱讀:2518發布時間:2012-7-6

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


 


培安有限公司主營產品:進口微波合成儀_品牌_微波合成儀價格_進口微波消解儀 化工儀器網 設計制作,未經允許翻錄必究.Copyright(C) http://www.acromondplus.com, All rights reserved.

以上信息由企業自行提供,信息內容的真實性、準確性和合法性由相關企業負責,化工儀器網對此不承擔任何保證責任。
溫馨提示:為規避購買風險,建議您在購買產品前務必確認供應商資質及產品質量。

在線留言
產品對比 產品對比 二維碼

掃一掃訪問手機商鋪

對比框

在線留言
主站蜘蛛池模板: 邹城市| 台东市| 鄯善县| 延庆县| 香港 | 农安县| 应城市| 石河子市| 海城市| 锡林郭勒盟| 宜丰县| 巴楚县| 香港 | 西乡县| 磐安县| 弋阳县| 龙陵县| 景宁| 哈巴河县| 龙里县| 贵阳市| 耒阳市| 淮北市| 甘谷县| 鱼台县| 元氏县| 汝南县| 邢台县| 岱山县| 福州市| 安徽省| 佛山市| 西和县| 三江| 卫辉市| 于都县| 延川县| 梅河口市| 惠安县| 昌邑市| 德兴市|