Glass Transition Behavior of Spray Dried Orange Juice Powder Measured by Differential Scanning Calorimetry (DSC) and Thermal Mechanical Compression Test (TMCT)
Glass Transition Behavior of Spray Dried Orange Juice Powder Measured by Differential Scanning Calorimetry (DSC) and Thermal Mechanical Compression Test (TMCT)
复制标题
DOI：
10.1080/10942910601109218
复制
发表时间：
2007-07
影响因子：
2.9
通讯作者：
A. Shrestha;Tharalinee Ua-arak;B. Adhikari;T. Howes;B. Bhandari
中科院分区：
文献类型：
--
作者：
A. Shrestha;Tharalinee Ua-arak;B. Adhikari;T. Howes;B. Bhandari
研究了不同浓度的麦芽糊精(DE6)对浓缩橙汁的喷雾干燥行为。浓缩橙汁和麦芽糊精的五种组合(25：75、30：70、35：65、40：60和50：50)分别在进口和出口温度160℃和65℃下喷雾干燥。麦芽糊精浓度为50%时回收的产品粘稠，粉料回收率仅为20%。橙汁粉的回收率随粉中麦芽糊精含量的增加而增加。除50%麦芽糊精粉末略大且密度较高外，其余各粉末的颗粒大小和堆积密度基本相同。喷雾干燥粉末的含水率较高，在测量玻璃化转变温度之前进行了干燥。无水喷雾干燥粉末的Tg值随着麦芽糊精浓度的增加而增加，从50%麦芽糊精的66℃增加到75%麦芽糊精粉末的97℃。用新型热机械压缩试验(TMCT)测得的所有产物的玻璃化橡胶转变温度(Tg-r)值均高于DSC测得的Tg值，且差值随麦芽糊精浓度的增加而增大。
Spray drying behavior of orange juice concentrate with various levels of maltodextrin (DE 6) was studied. Five combinations of orange juice concentrate and maltodextrin (25:75, 30:70, 35:65, 40:60, and 50:50) were spray dried at 160 and 65°C inlet and outlet temperatures, respectively. The product recovered with 50% maltodextrin concentration was sticky and only 20% powder was recovered. The recovery of orange juice powder increased as the amount of maltodextrin in powders increased. The particle size and bulk density remained almost the same in all except in 50% maltodextrin powder which was slightly larger and more dense. The moisture content of spray dried powders was high and desiccated before measuring glass transition temperature. The anhydrous spray dried powders showed increased Tg values with increasing maltodextrin concentration, from 66°C in 50% maltodextrin to 97°C in 75% maltodextrin containing powders. The glass rubber transition (Tg-r) values of all the products measured using novel Thermal Mechanical Compression Test (TMCT) were higher than Tg values measured by DSC; the difference in values increased with increase in maltodextrin concentration.