Citation
Antal T., . and Chong C. H., . and Law C. L., . and Sikolya L., . Effects of freeze drying on retention of essential oils changes in glandular trichomes of lemon balm leaves. pp. 387-394.
Abstract
The effect of chamber pressure of a freeze dryer on essential oil contents drying kinetics drying characteristics lemon balm leaves and morphology of lemon balm glandular trichomes (oil reservoirs) were investigated. It was found that overall freeze drying (FD) carried out at high (FD-HP) and low pressure (FD-LP) settings consist of sublimation rate first falling rate and second falling rate periods. Drying rate of FD-LP dried Lemon Balm leaves are higher than FD-HP dried samples where the drying rates ranged from 0.063 to 0.449 g H2O/ g DM. s and 0.0365 to 0.395 g H2O/ g DM. s respectively. 3rd order Polynomial model was found to be the best fit model for both drying kinetics. In terms of product quality eight (8) major constituents of lemon balm leaves essential oil were quantified. Further to this electro-microscope was used to observe the peltate glandular hairs structure. Product quality analysis showed that FD-HP retained higher amount of essential oil shape of glandular hairs but no positive effect on the freeze drying duration.
Download File
Full text available from:
Official URL: http://ifrj.upm.edu.my/21%20(01)%202014/55%20IFRJ%...
|
Abstract
The effect of chamber pressure of a freeze dryer on essential oil contents drying kinetics drying characteristics lemon balm leaves and morphology of lemon balm glandular trichomes (oil reservoirs) were investigated. It was found that overall freeze drying (FD) carried out at high (FD-HP) and low pressure (FD-LP) settings consist of sublimation rate first falling rate and second falling rate periods. Drying rate of FD-LP dried Lemon Balm leaves are higher than FD-HP dried samples where the drying rates ranged from 0.063 to 0.449 g H2O/ g DM. s and 0.0365 to 0.395 g H2O/ g DM. s respectively. 3rd order Polynomial model was found to be the best fit model for both drying kinetics. In terms of product quality eight (8) major constituents of lemon balm leaves essential oil were quantified. Further to this electro-microscope was used to observe the peltate glandular hairs structure. Product quality analysis showed that FD-HP retained higher amount of essential oil shape of glandular hairs but no positive effect on the freeze drying duration.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Freeze drying |
| AGROVOC Term: | Essential oils |
| AGROVOC Term: | Trichomes |
| AGROVOC Term: | Lemons |
| AGROVOC Term: | Pressure |
| AGROVOC Term: | Sublimation |
| AGROVOC Term: | Product quality |
| AGROVOC Term: | Melissa officinalis |
| AGROVOC Term: | Lamiaceae |
| AGROVOC Term: | Harvesting |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:26 |
| URI: | http://webagris.upm.edu.my/id/eprint/21302 |
Actions (login required)
 |
View Item |
