Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product
Freeze-drying is a drying process based on sublimation under vacuum condition. This process minimizes the degradation of the heat-sensitive herbal product in order to preserve its bioactivity and medicinal properties. This work evaluates the effects of concentration of Quercus infectoria galls ext...
| Main Authors: | , , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
Federation of Engineering Institutions of Islamic Countries
2006
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| Online Access: | http://psasir.upm.edu.my/id/eprint/39541/ http://psasir.upm.edu.my/id/eprint/39541/1/39541.pdf |
| _version_ | 1848849170946850816 |
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| author | Pin, Kar Yong Chuah, Teong Guan A., Abdull Rashih Mat Ali, Rasadah Choong, Thomas Shean Yaw Law, C. L. |
| author_facet | Pin, Kar Yong Chuah, Teong Guan A., Abdull Rashih Mat Ali, Rasadah Choong, Thomas Shean Yaw Law, C. L. |
| author_sort | Pin, Kar Yong |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Freeze-drying is a drying process based on sublimation under vacuum condition. This process minimizes the
degradation of the heat-sensitive herbal product in order to preserve its bioactivity and medicinal properties.
This work evaluates the effects of concentration of Quercus infectoria galls extract on the moisture content and
quality of its freeze-dried product. Gall of Quercus infectoria, locally named as Manjakani, is a widely used
traditional medicine originated from Western Asia and Southern Europe. The galls extract contains Tannic
acids and Gallic acids, which are powerful astringents. The moisture content of the freeze-dried products were
about 5 %w/w which were below the value required for product stability, 10 %w/w. From the results of High
Performance Liquid Chromatography (HPLC) analysis, there was no significant variation between the chemical
profiles of the products. Two sharp peaks were detected which indicated the presence of the bioactive
compounds. Thus, the bioactivity of the Quercus infectoria galls extract was preserved. The concentration of
chemical marker, gallic Acid, was calculated for each product. The energy for sublimation was also analyzed. |
| first_indexed | 2025-11-15T09:46:09Z |
| format | Conference or Workshop Item |
| id | upm-39541 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T09:46:09Z |
| publishDate | 2006 |
| publisher | Federation of Engineering Institutions of Islamic Countries |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-395412016-04-29T07:18:37Z http://psasir.upm.edu.my/id/eprint/39541/ Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product Pin, Kar Yong Chuah, Teong Guan A., Abdull Rashih Mat Ali, Rasadah Choong, Thomas Shean Yaw Law, C. L. Freeze-drying is a drying process based on sublimation under vacuum condition. This process minimizes the degradation of the heat-sensitive herbal product in order to preserve its bioactivity and medicinal properties. This work evaluates the effects of concentration of Quercus infectoria galls extract on the moisture content and quality of its freeze-dried product. Gall of Quercus infectoria, locally named as Manjakani, is a widely used traditional medicine originated from Western Asia and Southern Europe. The galls extract contains Tannic acids and Gallic acids, which are powerful astringents. The moisture content of the freeze-dried products were about 5 %w/w which were below the value required for product stability, 10 %w/w. From the results of High Performance Liquid Chromatography (HPLC) analysis, there was no significant variation between the chemical profiles of the products. Two sharp peaks were detected which indicated the presence of the bioactive compounds. Thus, the bioactivity of the Quercus infectoria galls extract was preserved. The concentration of chemical marker, gallic Acid, was calculated for each product. The energy for sublimation was also analyzed. Federation of Engineering Institutions of Islamic Countries 2006 Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/39541/1/39541.pdf Pin, Kar Yong and Chuah, Teong Guan and A., Abdull Rashih and Mat Ali, Rasadah and Choong, Thomas Shean Yaw and Law, C. L. (2006) Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product. In: Seminar on Engineering and Technology (SET2006), 4-5 Sept. 2006, Putrajaya, Malaysia. (pp. 200-207). |
| spellingShingle | Pin, Kar Yong Chuah, Teong Guan A., Abdull Rashih Mat Ali, Rasadah Choong, Thomas Shean Yaw Law, C. L. Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title | Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title_full | Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title_fullStr | Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title_full_unstemmed | Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title_short | Effects of the concentration of Quercus infectoria galls (Manjakani) extract on moisture content and quality of its freeze-dried product |
| title_sort | effects of the concentration of quercus infectoria galls (manjakani) extract on moisture content and quality of its freeze-dried product |
| url | http://psasir.upm.edu.my/id/eprint/39541/ http://psasir.upm.edu.my/id/eprint/39541/1/39541.pdf |