Norawanis Abdul Razak
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Preferred name
Norawanis Abdul Razak
Official Name
Norawanis, Abdul Razak
Alternative Name
Razak, N. A.
Razak, Norawanis Abdul
Razak, N. R. Abdul
Razak, Nurul Razliana Abdul
Norawanis, A. R.
Razaki, N. A.
Razak, N. R.
Razak, N. R. A.
Abdul Razak, Norawanis
Main Affiliation
Scopus Author ID
57191646675
Researcher ID
C-3766-2016

Research Output

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  • 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.
  • Publication
    The Effect of Infrared Drying on Orthosiphon Stamineus Leaves Quality
    ( 2021-01-01)
    Palanisamy V.V.
    ;
    Mohd Saifizi Saidon
    ;
    Norawanis Abdul Razak
    ;
    Ismail K.A.
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Sulong M.M.S.
    ;
    Alkhayyat A.
    ;
    Wan Azani Wan Mustafa
    ;
    Salah O.R.
    The dryer system is an important part of the drying of food and herbs, among other things. As a result, a special dryer is needed to keep the food or herbs fresh for as long as possible without killing the good nutrients. In this project, Orthosiphon stamineus herb will be used to dry using an Infrared dryer. Infrared drying involves transferring heat by radiation from a hot source to a lower-temperature substance that has to be heated or dried. The temperature of the heated element determines the peak wavelength of the radiation. The purpose of this project is to design an infrared dryer system and analyze the quality of the dried herb. The Orthosiphon Stamineus have been dried using a 200W Infrared dryer system at 60°C for 2hours. Total phenolic compounds and antioxidant capacity were determined using the Folin-Ciocalteu method and the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity assay and evaluated using a UV/VIS Spectrophotometer, respectively. A moisture analyzer was used to look at the changes in moisture content, and a colorimeter was used to look at the colour changes. The result showed that drying O.stamineus under 60°C has significantly affected the herbal leaves quality in terms of moisture content, colour properties, Antioxidant capacity, and Total phenolic content.
      25  1
  • Publication
    The Effect of Different Waste Material Binders in Relation to Khaya Senegalensis Solid Fuel Pellet Quality
    ( 2023-11-01)
    Ras Izzati Ismail
    ;
    Khor Chu Yee
    ;
    Alina Rahayu Mohamed
    ;
    Mustafa N.M.K.N.
    ;
    Lee Yit Leng
    ;
    Nur Lailina Makhtar
    ;
    Norawanis Abdul Razak
    Fuel pellets are an attractive renewable energy source derived from biomass sources thanks to their uniformity and ease of handling. However, raw biomass and waste material binders have several drawbacks, which include poor physical properties, particularly low density and compositional heterogeneity, which restrict their wider use as a general source of energy. Besides, due to the low energy density, low bulk density, and uneven shape and size of raw biomass, it is very difficult to store and transport biomass in its original form, which decreases transport efficiency. This study investigated the effect of waste material binders (rice husk, corn cob, and sugarcane bagasse) on the mechanical and thermal properties of Khaya Senagalensis pellets. The mechanical and thermal properties were determined according to ASTM standards. Waste material binders have affected pellet quality such as density, bulk density, moisture content, durability, compressive strength, shatter index, water resistance, ash content, volatile matter, fixed carbon, and calorific value. From the analysis, sugarcane bagasse as a binder shows the highest quality pellet in terms of mechanical properties. Sugarcane bagasse produces the highest density (0.967g/cm3), bulk density (0.4094), durability (99.71%), shatter index (98.85%), water resistance (98.35%), and thermal properties, which are the highest volatile matter (94.71%) and the lowest ash content (1.71%). In a nutshell, sugarcane bagasse is a good binder that gives a positive impact to the K.senegalensis pellets in terms of storage and transportation compared to corn cob and rice husk binder.
      37  1
  • Publication
    Pulsed UV Integrated Infrared Dryer System for Orthosiphon Stamineus Herb.
    ( 2022-01-01)
    Mohd Saifizi Saidon
    ;
    Mohd Sharizan Md Sarip
    ;
    Palanisamya V.V.
    ;
    Norawanis Abdul Razak
    ;
    Azmi A.I.
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Sulong M.M.S.
    ;
    Wan Azani Wan Mustafa
    The drying system is an important part for food and herbs preservation. Therefore, an effective drying system are needed to ensure the increase the shelf life of the food and herb without degrade its good nutrient and bioactive compound. In this study, Orthosiphon stamineus herb was used to dry using an Infrared dryer and combination of Pulsed UV light treatment + Infrared drying. Infrared drying involves transferring heat by radiation from a hot source to a lower-temperature substance that has to be heated or dried, meanwhile the pulsed UV light is a non-thermal treatment. The temperature of the heated element determines the peak wavelength of the radiation. The objective of this study is to design an infrared dryer system and analyze the quality of the dried herb. The Orthosiphon Stamineus have been dried using a 200W Infrared dryer system at 60°C. Total phenolic compounds and antioxidant capacity were determined using the Folin- Ciocalteu method and the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity assay measured using a UV/VIS Spectrophotometer. A moisture analyzer was used to look at the changes in moisture content, and a colorimeter was used to look at the colour changes. The result showed that drying Orthosiphon stamineus by using an Infrared dryer and combination of Pulsed UV light treatment + Infrared drying under 60°C has significantly affected the herbal leaves quality in terms of moisture content, colour properties, Antioxidant capacity, and Total phenolic content.
      32  2
  • Publication
    Mechanical and physical properties of khaya senegalensis solid fuel pellet with different binder percentages
    ( 2021-10-25)
    Ras Izzati Ismail
    ;
    Shaari A.R.
    ;
    Khor Chu Yee
    ;
    Alina Rahayu Mohamed
    ;
    Rahim M.S.b.A.
    ;
    Lee Yit Leng
    ;
    Wan Nur A'tiqah Wan Draman
    ;
    Nur Lailina Makhtar
    ;
    Norawanis Abdul Razak
    ;
    Mohd Riduan Jamalludin
    The characteristics of the solid fuel pellets, such as its strength, durability and density can be used to assess its quality. During the transport and storage, pellets with low strength and durability produces dusts and ultimately resulting in equipment blockage, high pollution emissions, and an increased risk of fire and explosion. Therefore, pellet manufacturing process should be given priority to improve pellet quality. The use of binder in the production of pellets will aid in improving pellet quality. Therefore, this study investigates the influence of different binder percentages on the mechanical properties of K. senegelensis fuel pellets. Durability, unit density, bulk density and diametral compressive strength testing were carried out in compliance with international standards. It was discovered that pellets containing 4% cassava starch binder produces better results, particularly in terms of durability and compressive ldiametral strength.
      37  1
  • Publication
    Production of Solid Biofuels From Renewable Resources: A Review
    ( 2023-06-09)
    Ras Izzati Ismail
    ;
    Khor Chu Yee
    ;
    Shaari A.R.
    ;
    Alina Rahayu Mohamed
    ;
    Abdul Halim M.H.B.
    ;
    Rahman A.A.A.
    ;
    Lee Yit Leng
    ;
    Nur Lailina Makhtar
    ;
    Norawanis Abdul Razak
    Increasing concerns over greenhouse gas emissions, volatile fossil fuel prices, and political instability have led to biomass as a renewable energy source. Close cooperation from the government supported by independent bodies also helps produce this effective and sustainable energy source. As a result, the current growth of solid biofuels has increased tremendously. Agricultural, municipal, forest, commercial waste and dedicated energy crops are the main sources of biomass. Due to this biomass's nature, the methods to produce them into solid biofuels are also different. The energy potential of these biomass sources is quite dependent on the use of technology and public awareness. Therefore, this paper review feedstock biomass, processing processes, product types and properties of solid biofuels in terms of mechanical and combustion. The paper also reviews the solid biofuel production situation in Malaysia.
      39  3
  • Publication
    Black box modelling of infrared drying system for herbs dehydration
    ( 2022-01-01)
    Mohd Saifizi Saidon
    ;
    Mohd Muqri Syahmi Sulong
    ;
    Wan Azani Wan Mustafa
    ;
    Azwan Iskandar Azmi
    ;
    Norawanis Abdul Razak
    ;
    Muhammad Faris Fauzi
    This study focused on development of infrared dryer system for Orthosiphon Stamineus leaves drying application. In any food technology, the dryer is the key component for quality drying food and herbs etc. An oven is modified to produce high technology drying system. A mathematical model is developed based on time response characteristics of the system. A second order model is found to adequately represent the system as it gives best fit with better properties than the first order model with error between measured data and simulation data is 0.44. Validation procedures show that the derived model is indeed a good enough representation of drying system. The infrared dryer system is highly non-linear and exhibits varying model parameters. An identification system is introduced to estimate the parameters and determine mathematical model of the system. ARMAX of na = 2, nb = 1 and nc = 1 polynomial model show best fit to experimental response of PRBS input.
      1  35
  • 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.
      1  32