利用差示扫描量热仪用经过退火处理的连续扫描法、不经过退火处理的连续扫描法和分步扫描法,对20%和50%蔗糖水溶液的玻璃化转变温度进行了测量.结果显示,退火处理的连续扫描法测量结果最好,测得蔗糖水溶液的玻璃化转变温度大致为-34.6℃,Tg'不受退火温度和溶液浓度的影响.三种方法测得20%蔗糖水溶液的Tg'的差别不大.退火方法和不退火方法测得50%蔗糖水溶液的Tg'差别很大.用两种不同的连续扫描方法做了几组测新鲜西瓜汁玻璃化转变温度的实验,结果在-42～-44℃之间.
参考文献
| [1] | Levine H;Slade L .Principles of "Cryostabillization"Technology from Structure/Property Relationships Carbohydrate/Water Systems a Review[J].Cryo-Letters,1998,9(01):21-63. |
| [2] | Ruan R;Chen P L .Measurement of State Transition Temperature Using NMR and MRI[J].Leatherhead Food RA Food Industry Journal,1999,2(03):238-250. |
| [3] | 华泽钊;任禾盛.低温生物医学技术[M].北京:科学出版社,1994:306-320. |
| [4] | Liesebach J.;Rades T.;Lim M. .A new method for the determination of the unfrozen matrix concentration and the maximal freeze-concentration[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2003(2):159-168. |
| [5] | 刘宝林 .食品玻璃化温度T<,g'>的测量及草莓低温玻璃化保存的实验研究[D].华东工业大学,1996. |
| [6] | Levine H;Slade L .A Food Polymer Science Approach to the Practice of Cryostabilization Technology[J].Comments on Agricultural and Food Chemistry,1989,1(06):315-396. |
| [7] | Kerr W L;Reid D S .The Use of Stepwise Differential Scanning calorimetry for Thermal Analysis of Foods[J].Thermochimica Acta,1994,246(02):299-308. |
| [8] | 胥义 .主动脉在相变温区的力学性能及影响因素研究[D].上海:上海理工大学,2005. |
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