Publications by authors named "N I Saharudin"

4 Publications

  • Page 1 of 1

Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent.

Molecules 2021 Apr 13;26(8). Epub 2021 Apr 13.

Chemistry Institute, Federal University of Uberlandia-UFU, Uberlândia 38400-902, Brazil.

Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films' modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.
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http://dx.doi.org/10.3390/molecules26082254DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8069814PMC
April 2021

Functional Properties and Molecular Degradation of Schizostachyum Brachycladum Bamboo Cellulose Nanofibre in PLA-Chitosan Bionanocomposites.

Molecules 2021 Apr 1;26(7). Epub 2021 Apr 1.

School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia.

The degradation and mechanical properties of potential polymeric materials used for green manufacturing are significant determinants. In this study, cellulose nanofibre was prepared from Schizostachyum brachycladum bamboo and used as reinforcement in the PLA/chitosan matrix using melt extrusion and compression moulding method. The cellulose nanofibre(CNF) was isolated using supercritical carbon dioxide and high-pressure homogenisation. The isolated CNF was characterised with transmission electron microscopy (TEM), FT-IR, zeta potential and particle size analysis. The mechanical, physical, and degradation properties of the resulting biocomposite were studied with moisture content, density, thickness swelling, tensile, flexural, scanning electron microscopy, thermogravimetry, and biodegradability analysis. The TEM, FT-IR, and particle size results showed successful isolation of cellulose nanofibre using this method. The result showed that the physical, mechanical, and degradation properties of PLA/chitosan/CNF biocomposite were significantly enhanced with cellulose nanofibre. The density, thickness swelling, and moisture content increased with the addition of CNF. Also, tensile strength and modulus; flexural strength and modulus increased; while the elongation reduced. The carbon residue from the thermal degradation and the glass transition temperature of the PLA/chitosan/CNF biocomposite was observed to increase with the addition of CNF. The result showed that the biocomposite has potential for green and sustainable industrial application.
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http://dx.doi.org/10.3390/molecules26072008DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037354PMC
April 2021

Isolation of Textile Waste Cellulose Nanofibrillated Fibre Reinforced in Polylactic Acid-Chitin Biodegradable Composite for Green Packaging Application.

Polymers (Basel) 2021 Jan 20;13(3). Epub 2021 Jan 20.

School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia.

Textile waste cellulose nanofibrillated fibre has been reported with excellent strength reinforcement ability in other biopolymers. In this research cellulose nanofibrilated fibre (CNF) was isolated from the textile waste cotton fabrics with combined supercritical carbon dioxide and high-pressure homogenisation. The isolated CNF was used to enhance the polylactic acid/chitin (PLA/chitin) properties. The properties enhancement effect of the CNF was studied by characterising the PLA/chitin/CNF biocomposite for improved mechanical, thermal, and morphological properties. The tensile properties, impact strength, dynamic mechanical analysis, thermogravimetry analysis, scanning electron microscopy, and the PLA/chitin/CNF biocomposite wettability were studied. The result showed that the tensile strength, elongation, tensile modulus, and impact strength improved significantly with chitin and CNF compared with the neat PLA. Furthermore, the scanning electron microscopy SEM (Scanning Electron Microscopy) morphological images showed uniform distribution and dispersion of the three polymers in each other, which corroborate the improvement in mechanical properties. The biocomposite's water absorption increased more than the neat PLA, and the contact angle was reduced. The results of the ternary blend compared with PLA/chitin binary blend showed significant enhancement with CNF. This showed that the three polymers' combination resulted in a better material property than the binary blend.
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http://dx.doi.org/10.3390/polym13030325DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7864045PMC
January 2021

A randomized half-body, double blind, controlled trial on the effects of a pH-modified moisturizer vs. standard moisturizer in mild to moderate atopic dermatitis.

An Bras Dermatol 2020 May - Jun;95(3):320-325. Epub 2020 Mar 21.

Department of Pharmacy, University Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia.

Background: Higher skin pH in atopic dermatitis contributes to impaired epidermal barrier. A moisturizer compatible with physiological pH could improve atopic dermatitis.

Objective: To determine the effect of a physiologically compatible pH moisturizer in atopic dermatitis.

Methods: A randomized half body, double blind, controlled trial involving patients with stable atopic dermatitis was performed. pH-modified moisturizer and standard moisturizer were applied to half body for 6 weeks.

Results: A total of 6 (16.7%) males and 30 (83.3%) females participated. Skin pH reductions from week 0, week 2 and 6 were significant at the forearms (5.315 [0.98] to 4.85 [0.54] to 5.04 [0.78], p=0.02) and abdomen (5.25 [1.01], 4.82 [0.64], 5.01 [0.59], p=0.00) but not at the shins (5.01 [0.80], 4.76 [0.49], 4.85 [0.79], p=0.09) with pH-modified moisturizer. Transepidermal water loss (TEWL) at the forearms decreased (4.60 [2.55] to 3.70 [3.10] to 3.00 [3.55], p=0.00), abdomen (3.90 [2.90] to 2.40 [3.45] to 2.70 [2.25], p=0.046). SCORAD improved from 14.1±12.75 to 10.5±13.25 to 7±12.25, p=0.00. In standard moisturizer group, pH reductions were significant at the forearms (5.29 [0.94] to 4.84 [0.55] to 5.02 [0.70], p=0.00) and abdomen (5.25 [1.09], 4.91 [0.63], 5.12 [0.66], p=0.00). TEWL at the forearm were (4.80 [2.95], 4.10 [2.15], 4.60 [3.40], p=0.67), shins (3.80 [1.40], 3.50 [2.35], 4.00 [2.50], p=0.91) and abdomen (3.70 [2.45], 4.10 [3.60], 3.40 [2.95], p=0.80). SCORAD improved from 14.2±9.1 to 10.9±10.65 to 10.5±11, p=0.00. Reduction in pH was observed with both moisturizers while TEWL significantly improved with pH-modified moisturizer. pH-modified moisturizer resulted in greater pH, TEWL and SCORAD improvements however the differences were not significant from standard moisturizer.

Study Limitation: Skin hydration was not evaluated.

Conclusion: Moisturization is beneficial for atopic dermatitis; use of physiologically compatible pH moisturizer is promising.
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http://dx.doi.org/10.1016/j.abd.2019.11.007DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7253898PMC
June 2020
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