Sintesis dan pencirian getah asli cecair terhidrogen untuk adunan polimer

Sistem hidrazin hidrat/hidrogen peroksida (HH/H2O2) digunakan untuk menjana sumber hidrogen bagi tujuan penghidrogenan getah asli cecair (LNR) melalui penghasilan diimida. Spesies diimida yang terhasil akan membekalkan sumber hidrogen kepada ikatan karbon ganda dua dalam rantai polimer LNR. Getah asli cecair terhidrogen (HLNR) yang terhasil menunjukkan ciri lebih tahan suhu berbanding LNR. Suhu degradasi HLNR didapati meningkat pada 435°C berbanding LNR iaitu pada 381°C. HLNR seterusnya dijadikan pengserasi dalam penghasilan adunan polimer polistirena/getah asli, PS/NR/HLNR (60/35/5). Kekuatan regangan dan impak PS/NR masing-masing meningkat sebanyak 70.7% dan 149.6% setelah HLNR ditambah sebagai pengserasi dalam adunan. Beberapa pemerhatian morfologi melalui mikroskop optik dan SEM turut menyokong kesan penyerasian adunan PS/NR dengan HLNR

Starch film incorporated with cinnamon oils optimally prepared by using response surface methodology

Recent progress in the food industry emphasizes on active packaging that integrates antimicrobial feature into food packaging made from biodegradable films. In this study, antimicrobial films were prepared from starch biopolymer incorporated with cinnamon oil as antimicrobial agent. Many studies have reported on the increasing antimicrobial properties of biofilms when the concentration of antimicrobial agent is increased, yet their tensile strength would be lowered. Therefore, the preparation of these films requires comprehensive optimization to ensure optimum properties of the resulting films. The aim of this study was to optimize the mechanical and antimicrobial property of film after adding cinnamon oil using response surface methodology (RSM). The optimization of variables to prepare the films was successfully accomplished by manipulating cinnamon oil loadings and mixing temperature as proposed by RSM. Several models were generated to associate those parameters with the responding variables such as tensile strength and antimicrobial activity against Bacillus cereus, Bacillus subtilis, Aspergillus niger, and Aspergillus brasiliensis with R2 values of 0.9835, 0.9816, 0.9709, 0.9930, and 0.9950, respectively. Subsequently, the optimum conditions for the preparation of starch/cinnamon oil films were found to be at 24.02% of cinnamon oil and 49.35 °C of mixing temperature. Our study has demonstrated a novel, statistical experimental design and elaborate discussion on the effects of processing parameters in preparing films composing of starch and cinnamon oil. In summary, the active films prepared from this study have displayed promising qualities as potential food packaging against most common food borne microorganism during the food storage

Pengoptimuman parameter untuk penurunan diimida getah asli cecair dalam sistem hidrazin hidrat/hidrogen peroksida menggunakan kaedah rangsangan permukaan (RSM)

Getah asli cecair (LNR) dihasilkan daripada proses penyahpolimeran getah asli yang menghasilkan rantaian polimer lebih pendek dan berat molekular kurang daripada 105. Namun, LNR masih mempamerkan tahap degradasi dan ketahanan termal yang rendah seperti getah asli, disebabkan oleh kehadiran ikatan karbon ganda dua pada rantaian polimer. Dalam kajian ini, penurunan diimida menggunakan pengoksidaan hidrazin hidrat dengan hidrogen peroksida dijalankan untuk menghidrogenkan unit tidak tepu LNR. LNR terhidrogen (HLNR) dicirikan menggunakan spektrometer infra-merah (FTIR) dan spektrometer resonans magnetik nuklear (NMR). Pengoptimuman parameter tindak balas dilakukan dengan memanipulasi parameter masa dan suhu tindak balas berdasarkan kaedah rangsangan permukaan (RSM) dengan 5-aras-2-faktor reka bentuk komposit putaran tengah (CCRD). Satu model kuadratik yang signifikan telah dihasilkan untuk menghubungkan dua parameter tersebut dengan nilai R2 adalah 0.9986, menunjukkan bahawa model yang terhasil adalah sangat sepadan dengan data uji kaji. Keputusan kajian menunjukkan bahawa peratus penghidrogenan boleh ditingkatkan sehingga 91.2%. Seterusnya, berdasarkan RSM, parameter yang optimum bagi penurunan diimida LNR ini didapati pada suhu 55.9oC selama 6.7 jam, menghasilkan 80.2% HLNR. Kajian ini telah menunjukkan reka bentuk uji kaji secara statistik yang novel bagi menghidrogenkan LNR. Pelbagai variasi peratus penghidrogenan produk HLNR dalam kajian ini menyumbang kepada lebih banyak aplikasi produk yang memerlukan peratusan ketepuan unit yang tertentu

Statistical Optimization Using Response Surface Methodology for Enhanced Tensile Strength of Polyethylene/Graphene Nanocomposites

Despite having remarkable features such as low density, ease of fabrication and recyclability, linear low-density polyethylene (LLDPE) has several drawbacks like poor stiffness and low creep resistance which fortunately can be improved by incorporating with other suitable nanofillers. In this study, graphene nanoplatelets (GNPs) that are well-known for its high surface area and superior stability were selected to reinforce the polymer network of LLDPE via melt blending. During mixing processing, the rotor speed, mixing temperature and mixing time parameters are manipulated with the aids of 5-level-3-factor central composite rotatable design (CCRD) in order to determine the optimization of processing parameters in preparing LLDPE/GNPs nanocomposites. The experimental data is fitted with the statistically significant quadratic model with R2 value of 0.8601. The results showed that the tensile strength of LLDPE/GNPs nanocomposites could be extended to 24.80 MPa.  The optimum processing parameters for preparation LLDPE/GNPs nanocomposites were found to be at 101 rpm rotor speed, 139.8oC of mixing temperature and 13.2 min of mixing time, resulting in LLDPE/GNPs nanocomposites with tensile strength of 24.11 MPa. Conclusively, our study has provided a novel statistical design of experiment to obtain the optimum processing parameters in preparing LLDPE/GNPs nanocomposites

4th International Conference on Forensic Sciences, Forensic Medicine and Criminology 2023 (INFOMEC 4.0)

The INFOMEC 2023 organized by the Management and Science University (MSU) is proud to celebrate the 4th anniversary of the International Conference on Forensic Science, Forensic Medicine, and Criminology. This is a premier gathering of experts from around the world who will be sharing their knowledge and expertise, exchange ideas, and discuss the latest advancements and techniques in the field. The conference features a diverse range of topics related to forensic science, forensic medicine, and criminology, including forensic pathology, forensic toxicology, forensic DNA analysis, crime scene investigation, forensic psychology, and criminal profiling, among others. Participants will have the opportunity to attend keynote presentations, poster sessions, and network with colleagues and peers from academia, government, and industry. The conference is an excellent platform for researchers, practitioners, and students to present their research findings and gain valuable feedback from experts in the field. Overall, the International Conference on Forensic Science, Forensic Medicine, and Criminology is an essential event for anyone involved in the fields of forensic science, forensic medicine, and criminology, providing an opportunity to stay up-to-date with the latest trends and developments, and contribute to the advancement of the field

20th International Medical, Pharmaceutical, Cosmeceutical and Health Science Symposium

The 20th International Medical, Pharmaceutical, Cosmeceutical & Health Science Symposium (iMPaCHS) is an annual symposium co-organized by Faculty of Life and Health Sciences, International Medical School, School of Pharmacy, Management & Science of the Management & Science University, Malaysia. With the theme 'Advancing Health Science Innovations through Interdisciplinary Collaboration', the 20th iMPaCHS aims to promote holistic research skills for future betterment. Advancing health science innovations requires a multidisciplinary approach, which involves the collaboration of experts from various fields. Interdisciplinary collaboration enables the integration of knowledge, perspectives, and methodologies from different disciplines, leading to the development of novel and effective solutions to complex health challenges. By fostering interdisciplinary collaboration, health science can leverage the strengths of each field and accelerate the translation of research findings into clinical practice, ultimately improving and advancing the overall state of health science. This is in line with the sustainable development goal and collaborative research activity in the university. The 20th International Medical, Pharmaceutical, Cosmeceutical & Health Science Symposium (iMPaCHS) is an annual symposium co-organized by Faculty of Life and Health Sciences, International Medical School, School of Pharmacy, Management & Science of the Management & Science University, Malaysia. With the theme 'Advancing Health Science Innovations through Interdisciplinary Collaboration', the 20th iMPaCHS aims to promote holistic research skills for future betterment. Advancing health science innovations requires a multidisciplinary approach, which involves the collaboration of experts from various fields. Interdisciplinary collaboration enables the integration of knowledge, perspectives, and methodologies from different disciplines, leading to the development of novel and effective solutions to complex health challenges. By fostering interdisciplinary collaboration, health science can leverage the strengths of each field and accelerate the translation of research findings into clinical practice, ultimately improving and advancing the overall state of health science. This is in line with the sustainable development goal and collaborative research activity in the university

Prosedur pengekstrakan untuk analisis logam berat dalam tisu tumbuhan dan persekitaran Hevea brasiliensis

Pengukuran logam berat dalam sampel tumbuhan berguna untuk menunjukkan kualiti udara persekitaran yang diserap. Walau bagaimanapun, ikatan logam berat dengan matriks organik memerlukan kaedah pengekstrakan yang sesuai untuk melepaskannya kerana cara penjerapan yang berbeza mengikut sampel. Dalam kajian ini, kami meneroka beberapa kaedah pengekstrakan untuk menghasilkan kepekatan logam berat yang maksimum dalam sampel pokok Hevea brasiliensis dan tanah sekitarnya di Bentong, Pahang, Malaysia. Pengesktrakan yang maksimum adalah penting untuk memberikan maklumat analisis logam berat yang sebenar. Rendaman sejuk, pengekstrakan ultrasonik, pencernaan gelombang mikro, teknik pengeringan abu dan pencernaan asid panas dilakukan dan dibandingkan dengan analisis logam berat dalam sampel tanah, daun, kulit pokok dan lateks. Seterusnya, kandungan logam berat tersebut dikuantifikasi menggunakan spektrofotometer pancaran plasma-gandingan aruhan (ICP-OES). Hasilnya, setiap sampel didapati memerlukan kaedah pencernaan yang eksklusif untuk mengekstrak logam berat dengan jumlah tertinggi. Teknik pencernaan asid panas dan pengeringan abu adalah kaedah pencernaan yang paling sesuai, masing-masing untuk tanah dan getah, manakala pencernaan gelombang mikro mengekstrak logam paling berat dalam sampel daun dan kulit pokok. Antara semua sampel tanaman, daun memerangkap paling banyak logam paling berat (767.4 mg/kg) diikuti oleh kulit kayu (600.2 mg/kg) dan lateks (185.4 mg/kg). Analisis logam berat melaporkan nilai faktor pengayaan (EF) logam berat yang tinggi (EF > 10) menerangkan kepekatan logam berat yang tinggi dalam setiap sampel. Selain itu, pengiraan faktor biokepekatan (BCF) membuktikan bahawa logam berat dalam sampel datang daripada sampel tanah melalui sistem akar pokok apabila nilai BCF > 1

Penghidrogenan getah asli cecair menggunakan sistem mangkin selenium

Kaedah rangsangan permukaan (RSM) dengan reka bentuk komposit putaran tengah (CCRD) telah digunakan untuk mengoptimumkan parameter bagi penghidrogenan getah asli cecair (LNR) dalam sistem hidrazin hidrat (HH) dan hidrogen peroksida (H2O2) dengan kehadiran selenium sebagai mangkin. Parameter yang dikaji bagi tindak balas ini adalah nisbah mol HH:LNR (1.25-2.25), nisbah mol H2O2:LNR (1.25-2.25), suhu (40-80°C) dan masa tindak balas (4-8 jam). Berdasarkan data yang diperoleh, penghasilan getah asli cecair terhidrogen (HLNR) sesuai dijelaskan dengan model kuadratik. Model kuadratik ini mempunyai nilai pekali penentuan (R2) sebanyak 0.9596 yang menunjukkan korelasi yang tinggi antara peratus penghidrogenan sebenar dengan peratus yang telah diramalkan. Berdasarkan plot permukaan tindak balas 3D, suhu tindak balas memainkan peranan penting dalam penghidrogenan LNR. Keadaan optimum yang diperoleh melalui RSM bagi kajian ini adalah nisbah mol HH:LNR pada 1.50, nisbah mol H2O2:LNR pada 2.00, suhu tindak balas pada 53.34°C dengan masa tindak balas selama 5.21 jam yang memberikan peratusan penghidrogenan HLNR sebanyak 68.98%. Persamaan polinomial kuadratik yang diperoleh daripada RSM ini berguna untuk menghasilkan HLNR dengan peratusan penghidrogenan yang dikehendaki

Studies on Hydrogenation of Liquid Natural Rubber Using Diimide

Liquid natural rubber (LNR) is a depolymerized natural rubber (NR) which consists of shorter polymeric chains and lower molecular weight (Mw<105). Hydrogenated LNR (HLNR) was synthesized via the thermal decomposition of p-toluenesulfonyl hydrazide (TSH) or 2,4,6-trimethylbenzenesulfonyl hydrazide (MSH). The LNR and HLNR structures were characterized by Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The percentage of hydrogenation was calculated from NMR spectrum. The optimum percentage of hydrogenation (>90%) was achieved by manipulating the reaction parameters such as sources of diimide, TSH concentration, solvent, and reaction time. The optimum condition was 3 : 1 weight ratio of TSH/LNR in o-xylene at 130°C in 4-hour reaction period