Nuradibah Mohd Amer
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Nuradibah Mohd Amer
Official Name
Nuradibah, Mohd Amer
Alternative Name
Mohd Amer, Nuradibah A.
Nuradibah, M. A.
Amer, Nuradibah Mohd M.
Main Affiliation
Scopus Author ID
57219024135

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Preliminary studies on antimicrobial activity of extracts from aloe vera leaf, citrus hystrix leaf, zingiber officinale and Sabah snake grass against bacillus subtilis

2018 , Muhammad Nur Aiman Uda , Subash Chandra Bose Gopinath , Nur Hulwani Ibrahim , Mohd Khairul Rabani Hashim , Nuradibah Mohd Amer , Midhat Nabil Ahmad Salimi , Tan Ewe Shen , Ong Yee Fen , Maisara Azad Mat Akhir , Uda Hashim

Herbal plants have several potential antimicrobial activities either as antifungal or antibacterial to fight against the disease and pathogen that attack the plants. The extractions of the Aloe vera leaf, Citrus hystrix leaf, Zingiber officinale rhizome and Sabah snake grass were selected in this study to fight against Bacillus subtilis. B. subtilis is a Gram-positive bacterium, rodshaped and catalase-positive that lives on decayed organic material. It is known as Gram-positive bacteria because of its thick peptidoglycan and would appear purple when subjected to Gram test. This species is commonly found in the upper layers of the soil, in meat or vegetables, in pastry, cooked meat, in bread or poultry products. The extracts of Sabah Snake Grass found to be most effective than A.vera leaf, Z. officinale, and C. hystrix against the B. subtilis.

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Effect of Potassium Permanganate and Zeolite on Shelf Life and Quality of Musa Acuminata

2020-07-09 , Yi Yin C. , Maisara Azad Mat Akhir , Muhammad Nur Aiman Uda , Nuradibah Mohd Amer

This paper study the effect of ethylene scavenger treatments in different quantity (T0: 0g, T1: 1g, T2: 3g, T3: 5g and T4: 10g per sachet) and types of packaging (T5: non-perforated and T6: perforated packaging) on Musa Acuminata to its shelf life and physicochemical quality. Potassium permanganate (KMnO4) and zeolite were used as ethylene absorbent which stored together with the bananas under uniform atmospheric condition at temperature of 25-28°C and 85-95% of relative humidity (RH). Physicochemical analysis (e.g. weight loss, peel colour changes, firmness, total soluble solid content and titratable acidity) were performed to evaluate the effectiveness of each treatments throughout its storage period. Results showed that treatment with higher quantity of KMnO4-zeolite (T4: 10g) shows reduction and retardation in percent weight loss (9.62%), peel colour changes, firmness changes (28.2%), total soluble solid (TSS) (12.1% Brix), titratable acidity (TA) (0.084% malic acid) and also greater storability of banana. Therefore, postharvest losses can be reduced by the mentioned treatment and it can be implemented in postharvest industries for extending the shelf life of banana effectively.

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Kinetic Extraction of Antioxidant and Total Phenoloc Content of Clinachantus nutans

2020-07-09 , Aqilah Abd Rahim, Syafiqah , Nuradibah Mohd Amer , Khairul Farihan Kasim

Clinacanthus nutans or Belalai Gajah is one of the herbs that contain natural antioxidant. This natural antioxidant can be used commercially in food as well as pharmaceutical industries. This research explored antioxidant of C. nutans and it was extracted by using solid-liquid extraction. Antioxidant of C. nutans extract was determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay and Total Phenolic Content (TPC) were determined using Folic-Ciocalteau reagent. Screening of the suitable particle size to be used in the extraction of C. nutans shows that mixture and leaves of C. nutans with particle size <63 μm was the best to obtain the highest DPPH scavenging activity. However, only mixture of C. nutans sample was used for the thermal extraction kinetic due to the availability of the samples. Thermal extraction kinetic of DPPH was fitted to the exponential growth model and show a good fit with R^2 = 0.9921. When transformed, the data gave a linear Arrhenius plot, R^2=0.717 with an activation energy of 17.35 x 0.108 kJ/mol. Thermal extraction kinetic of TPC was fitted to the exponential growth model and show a good fit with R^2 = 0.9892. When transformed, the data gave a linear Arrhenius plot, R^2=0.897 with an activation energy of 5.3832 x 0.451 kJ/mol. The model is adequate to predict DPPH scavenging activity and TPC of the C. nutans extracts with no significant different of the prediction and validation conducted at temperature of 70 °C for 30 min.

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Preliminary studies on antimicrobial activity of extracts from aloe vera leaf, citrus hystrix leaf, zingiber officinale and Sabah snake grass against bacillus subtilis

2018 , M.N.A. Uda , Subash Chandra Bose Gopinath , Nur Hulwani Ibrahim , Mohd Khairul Rabani Hashim , Nuradibah Mohd Amer , Midhat Nabil Ahmad Salimi , Tan Ewe Shen , Ong Yee Fen , Maisara A. M. Akhir , Uda Hashim

Herbal plants have several potential antimicrobial activities either as antifungal or antibacterial to fight against the disease and pathogen that attack the plants. The extractions of the Aloe vera leaf, Citrus hystrix leaf, Zingiber officinale rhizome and Sabah snake grass were selected in this study to fight against Bacillus subtilis. B. subtilis is a Gram-positive bacterium, rodshaped and catalase-positive that lives on decayed organic material. It is known as Gram-positive bacteria because of its thick peptidoglycan and would appear purple when subjected to Gram test. This species is commonly found in the upper layers of the soil, in meat or vegetables, in pastry, cooked meat, in bread or poultry products. The extracts of Sabah Snake Grass found to be most effective than A.vera leaf, Z. officinale, and C. hystrix against the B. subtilis.

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Extraction of Spear Grass (Imperata Cylindrica) as Pro-Oxidant In polymer blends

2018 , Nuradibah Mohd Amer , N. A. Abdul Halim , K.F. Kasim , S.T. Sam , H.I. Zulhaimi , Muhammad Nur Aiman Uda

Packaging material such as plastic bags is one of the main factors that contribute to the environmental pollution due to slow degradation. The usage of metal oxide as pro-oxidant has been proven to accelerate the degradation of these materials, but the excessive usage of this pro-oxidant will be harmful to the human body. Therefore, in this research, spear grass is investigated to be used as natural based pro-oxidant that can increase the degradation rate of the polymers. In terms of that, spear grass is extracted by using pressurized hot water extraction (PHWE) to obtain the metal element such as zinc (Zn) and ferum (Fe). PHWE is using water as a solvent which is highly favourable due to non-toxicity and non-flammable characteristics that make it easy to handle. Box-Behnken design is used to optimize the temperature, extraction time, and sample-to-solvent ratio to get the maximum amount of Zn and Fe concentration from the extracted spear grass. As a conclusion, the leaf of spear grass contributed the highest amount of Zn and Fe concentration. The highest amount of Zn and Fe concentration is achieved at 150 °C, 20 minutes, and 3 g of sample to 45 ml of water.

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Properties and biodegradability of low density Polyethylene/ thermoplastic soya spent powder blends added spear grass powder as pro-oxidant

2016 , Nuradibah Mohd Amer

Plastic waste is a serious environmental problem and become an enormous challenge to waste management. A high determination to produce eco-friendly polymer has led the researchers to investigate about biodegradable polymers by adding natural polymer into the non-degradable plastic material. Thermoplastic is a material that produced by incorporating the plasticizer into the natural polymer, ie starch. Therefore in this research, an attempt was made by incorporating protein based natural polymer which was soya spent powder (SSP) into LDPE matrix. This study investigated the influence of glycerol on the properties of blends prepared from low density polyethylene (LDPE) with different SSP content varied from 5 to 25 wt%. Spear grass powder as a natural pro-oxidant (1.5 wt%) has been added into LDPE/SSP and LDPE/TSSP blends. Natural weathering test and soil burial test were performed for 9 months period to determine the potential of this polymer to degrade in different surroundings. As a result, LDPE/TSSP blends showed higher strength and elongation at break (Eb) compared to LDPE/SSP blends after weathering and composting. However, after the addition of spear grass powder, the tensile strength and Eb of LDPE/TSSP blends decreased. Scanning electron microscopy (SEM) micrographs showed the formation of crack, pores and fungus colonization on of LDPE/SSP and LDPE/TSSP blends surfaces. For differential scanning calorimetry (DSC) analysis, LDPE/TSSP blends presented higher crystallinity (15.65% for 25 wt% TSSP) compared to LDPE/SSP blends for the same blends ratio (14.76%). The thermal stability for each blends decreased from 451 °C (for neat LDPE) with an increase of 25 wt% of SSP (269 °C) and TSSP (284 °C) content. Three different strains have been successfully isolated in this study. Aspergillus fumigatus from the genus of Aspergillus encountered the highest percentage increment of cell dry weight (mg) which is 56% through the fermentation process.

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