微胶囊粒径对甜橙油中D-柠檬烯释放特性的影响

Effect of microcapsule size on the release characteristics of D-limonene from Sweet Orange Oil

为探究微胶囊粒径对甜橙油中主要风味物质D-柠檬烯释放特性的影响,制备了3种粒径的甜橙油微胶囊,研究其在37℃,相对湿度25%、33%、52%和75%贮藏5周D-柠檬烯释放及其动力学,以及制成压片糖后在水和酸模拟体系中D-柠檬烯的缓释性能及机制。结果表明,在相对湿度25%时,3种粒径的微胶囊都具有较稳定的D-柠檬烯保留率。而当相对湿度增加到75%,粒径越小,则D-柠檬烯保留率越高。D-柠檬烯释放动力学结果表明,释放速率常数k随着相对湿度增加而增加,粒径最小的纳米粒径胶囊具有最低释放常数。相对湿度25%~33%时,释放机制参数n<1,释放扩散速度受限,而当相对湿度为75%时,n>1。在2种模拟食品体系中,D-柠檬烯在80 min内已基本释放,表现出良好的缓释性。10 min内压片糖中D-柠檬烯释放符合Peppas-Sahlin模型。水体系中,D-柠檬烯遵循扩散释放机制;酸体系中,大粒径压片糖中D-柠檬烯呈侵蚀释放机制,但在小粒径压片糖和纳米粒径压片糖呈扩散释放机制。

To investigate the effect of particle size(PS)on the release characteristics of d-limonene from sweet orange oil microcapsules,three kinds of PS orange oil microcapsule(LP,MP and NP)were prepared.The release profile and kinetics of D-limonene were studied during five weeks’storage(37℃)at 25%,33%,52%and 75%relative humidity(RH).Moreover,the microcapsules were added into pressed candy(S-LP,S-SP and S-NP)to study the D-limonene sustained-release performance and mechanism in water and acid simulation system.The results showed that at 25%RH,three kinds of PS microcapsule had a relatively stable D-limonene retention rate.When the humidity increased to 75%RH,the d-limonene retention increased with the decrease of particle size.The release kinetics of D-limonene showed that the release rate k increased with the increase of RH,and the NP with the smallest particle size had the lowest k.Moreover,at 25%-33%RH,the release mechanism parameter n<1,the release diffusion rate is limited,and at 75%RH,n>1.In the two simulated food systems,D-limonene in pressed candy was almost released in 80 minutes which showed good sustained-release performance.The release of D-limonene within 10 minutes was in accordance with the Peppas-Sahlin model.In water system,D-limonene followed the diffusion release mechanism.In the acid system,D-limonene in S-LP followed the erosion release mechanism,but in S-SP and S-NP,it followed the diffusion release mechanism.