ENCAPSULATION OF LEMONGRASS (Cymbopogon citratus) OLEORESIN WITH β-CYCLODEXTRIN: PHASE SOLUBILITY STUDY AND ITS CHARACTERISATION

被引:0
|
作者
Ain, Nur A. H. [1 ]
Diyana, Farah D. H. [1 ]
Zaibunnisa, A. H. [1 ]
机构
[1] Univ Teknol MARA, Fac Sci Appl, Food Technol Programme, Shah Alam 40450, Selangor, Malaysia
来源
BIOTECHNOLOGY AND FOOD SERVICE | 2011年 / 7卷
关键词
lemongrass; Pressurised Liquid Extraction; encapsulation; beta-cylodextrin; geranial; phase solubility; EXTRACTION;
D O I
暂无
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Lemongrass oleoresin was successfully extracted from lemongrass (Cymbopogon citratus) using Pressurised Liquid Extraction. The biological active constituent in lemongrass oleoresin is citral or its isomers; geranial and neral is more than 75% by weight of essential oil. Geranial was used as marker compound for this study. The solubility of geranial increased with the addition beta-cyclodextrin until it reached the solubility limit at 7 mM beta-cyclodextrin, with no further improvement after that. The phase solubility diagram obtained was characterised as B-S. Inclusion complex of geranial was prepared by using co-precipitation (CP) and kneading method (KM). Based on phase solubility study, the stability constant, K-1:1, it indicated that molar ratio obtained was 1:1 beta-cyclodextrin (beta-CD):geranial for complexation. The complexes formed were characterised by using Fourier transform infrared spectrometry (FTIR) and differential scanning calorimeter (DSC). The shift of C-H stretching to higher wavenumber and the reduction of intensity of band C=O and C-H band indicated the formation of new solid phase; beta-CD-lemongrass oleoresin. The DSC thermogram showed the new solid phase formed using co-precipitation and kneading methods. The peak intensity of co-precipitation shows the highest compared to kneading. The results obtained from FTIR analysis showed that co-precipitation and kneading methods were able to produce inclusion complex. However, DSC indicates that co-precipitation method able to produce inclusion complex. Therefore, co-precipitation was the chosen method for the formation of inclusion complex between lemongrass oleoresin and beta-cyclodextrin.
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页码:44 / 48
页数:5
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