Sriyana Abdullah
Thumbnail Image
Preferred name
Sriyana Abdullah
Official Name
Sriyana, Abdullah
Alternative Name
Abdullah, S.
Main Affiliation
Scopus Author ID
57215616236
Researcher ID
CBB-0793-2022

Research Output

Filters

2
2
Reset filters

Settings
Now showing 1 - 2 of 2
  • Publication
    Changes in the physical and chemical properties of C. nutans herbal leaves dried under different drying methods
    ( 2021-05-24)
    Sriyana Abdullah
    ;
    Rafidah Nordin
    ;
    Rzemin M.A.A.
    ;
    Norawanis Abdul Razak
    Drying is a well-known preservation method that uses to extent the shelf life of food materials during storage. In herbal industry, the drying is conducted by using several methods. It is believed that drying methods could affect the herbs physical and chemical properties. In this project, the effects of different drying methods on colour changes, rehydration ratio and bioactive constituent of C. nutans herb were investigated. The herb was dried under sunlight, shade, vacuum oven, and microwave. Results showed that the dried leaves have better retention of TPC and higher antioxidant activity as compared to the fresh leaves. Vacuum oven dried samples showed the highest antioxidant activity and significantly high in TPC. Besides, vacuum and under shade dried herbal leaves had no significant effect on the colour changes. Moreover, leaves dried under vacuum oven was also observed to exert the highest rehydration ratio due to less cell breakdown during drying. Therefore, vacuum drying has greater performance in term of retaining colour, less microstructure changes and greater TPC and antioxidant activity. It could be suggested that by adding vacuum to other drying methods may able to enhance the herbal quality.
  • Publication
    Infrared drying of Clinacanthus nutans leaves
    ( 2022-03-01)
    Sriyana Abdullah
    ;
    Yusof Y.A.
    ;
    Rukunudin I.H.
    ;
    Abdul Karim Shah N.N.
    ;
    Norawanis Abdul Razak
    Clinacanthus nutans herbal leaf was dried using an infrared dryer under different power levels (100 W, 200 W, and 300 W) and at different distances between infrared source and samples (10 cm, 20 cm, and 30 cm). Results showed that the drying rate increased when power levels increased and distances decreased. There were found that Midili and Kucuk, Modified Henderson and Pabis, Verma, Two Term, and Wang and Singh gave the best fitting to the experimental moisture ratio for a specific drying treatment. The moisture diffusivity values determined were 4 Ã— 10−11 to 3.09 Ã— 10−10 m2/ s and the activation energy values ranged from 30.81 to 50.58 W/g. Infrared drying can be an option for quick preservation technique for C. nutans herbal leaves as it gave a shorter drying time which could optimize the energy usage. Novelty impact statement: The drying rate of C. nutans leaves was able to increase at a faster rate by infrared radiation as compared to the conventional methods. This result gave a significant reduction of drying time that may reduce energy consumption and enhance the physicochemical properties of the herb.