摘要
研究不同冷却结晶条件下CTCBE和CB的晶型衍变与胀罐的关系。采用差示扫描量热仪(DSC)、X-射线衍射仪(XRD)对不同结晶条件下两种可可脂样品进行热分析及晶相分析研究。结果表明未经调温CTCBE缓冷时中心样存在十分严重晶型衍变(粉状物,DSC测试显示双熔点峰),引起晶体结构的改变,导致胀罐发生;而急冷时晶型衍变程度低,不导致胀罐。同样条件下CB晶型衍变程度极低(DSC测试显示单熔点峰),不发生胀罐。经调温处理CTCBE急冷和缓冷对XRD晶相衍射数据基本无影响;而未经调温处理CTCBE在急冷和缓冷时两者晶相衍射数据存在一定差异。调温与未经调温CB在缓冷或急冷时的X-射线衍射数据均具有一致性。
The relations between phase transitions and can-breaking of CTCBE and CB under different crystallization conditionswere investigated. The thermal and crystallization properties of CTCBE and CB were determined by Differential ScanningCalorimetry (DSC) and X-Ray Diffraction (XRD). The results showed that serious phase transition (powder-like, double peaksin DSC) occurred in the central parts of untempered CTCBE under slow cooling condition, which changed the crystal structureof CTCBE and lead to can-breaking. Slight phase transition occurred in the central parts of untempered CTCBE under quickcooling condition, which is not strong enough to cause can-breaking. Almost no phase transition occurred ( single peak in DSC)under the same crystallization conditions in CB and no can-breaking happened. The XRD data of the crystals were the same fortempered CTCBE, and were different for untempered CTCBE, under quick and slow cooling conditions. There were consistencesin XRD data between tempered and untempered CB, both under slow cooling condition and under quick cooling condition.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2004年第11期84-88,共5页
Food Science
基金
国家自然科学基金资助项目(20062005)
江西省自然科学基金资助项目(0220014)
