Browse publications by year: 2024

  1. Janahiraman S, Shahril NS, Jayaraj VJ, Ch'ng S, Eow LH, Mageswaren E, et al.
    Clin Rheumatol, 2024 Aug;43(8):2489-2501.
    PMID: 38922551 DOI: 10.1007/s10067-024-07035-x
    Tofacitinib is the first oral JAK inhibitor approved for treating rheumatoid arthritis (RA). To enhance our understanding of tofacitinib drug response, we used hierarchical clustering to analyse the profiles of patient who responded to the treatment in a real-world setting. Patients who commenced on tofacitinib treatment were selected from 12 major rheumatology centres in Malaysia. The aim was to assess their response to tofacitinib defined as achieving DAS28-CRP/ESR ≤ 3.2 and DAS28 improvement > 1.2 at 12 weeks. A hierarchical clustering analysis was performed using sociodemographic and clinical parameters at baseline. All 163 RA patients were divided into three clusters (Clusters 1, 2 and 3) based on specific clinical factors at baseline including bone erosion, antibody positivity, disease activity and anaemia status. Cluster 1 consisted of RA patients without bone erosion, antibody negative, low baseline disease activity measure and absence of anaemia. Cluster 2 comprised of patients without bone erosion, RF positivity, anti-CCP negativity, moderate to high baseline disease activity score and absence of anaemia. Cluster 3 patients had bone erosion, antibody positivity, high baseline disease activity and anaemia. The response rates to tofacitinib varied among the clusters: Cluster 1 had a 79% response rate, Cluster 2 had a 66% response rate, and Cluster 3 had a 36% response rate. The differences in response rates between the three clusters were found to be statistically significant. This cluster analysis study indicates that patients who are seronegative and have low disease activity, absence of bone erosion and no signs of anaemia may have a higher likelihood of benefiting from tofacitinib therapy. By identifying clinical profiles that respond to tofacitinib treatment, we can improve treatment stratification yielding significant benefits and better health outcomes for individuals with RA.
    MeSH terms: Adult; Aged; Female; Humans; Malaysia; Male; Middle Aged; Pyrroles/therapeutic use; Severity of Illness Index; Cluster Analysis; Treatment Outcome; Antirheumatic Agents/therapeutic use; Protein Kinase Inhibitors/therapeutic use
  2. Dobbelaar E, Goher SS, Vidal JL, Obhi NK, Felisilda BMB, Choo YSL, et al.
    Angew Chem Int Ed Engl, 2024 Aug 26;63(35):e202319892.
    PMID: 39046086 DOI: 10.1002/anie.202319892
    The concepts of sustainability and sustainable chemistry have attracted increasing attention in recent years, being of great importance to the younger generation. In this Viewpoint Article, we share how early-career chemists can contribute to the sustainable transformation of their discipline. We identify ways in which they can engage to catalyse action for change. This article does not attempt to answer questions about the most promising or pressing areas driving research and chemical innovation in the context of sustainability. Instead, we want to inspire and engage early-career chemists in pursuing sustainable actions by showcasing opportunities in education, outreach and policymaking, research culture and publishing, while highlighting existing challenges and the complexity of the topic. We want to empower early-career chemists by providing resources and ideas for engagement for a sustainable future globally. While the article focuses on students and early-career chemists, it provides insights to further stimulate the engagement of scientists from diverse backgrounds.
    MeSH terms: Humans
  3. Wong HY, Rajasuriar R, Wong PL, Lee YK
    Sex Transm Dis, 2024 Dec 01;51(12):826-837.
    PMID: 39046151 DOI: 10.1097/OLQ.0000000000002053
    INTRODUCTION: Older adults newly diagnosed with HIV experience poorer prognosis and higher mortality compared with those diagnosed at younger ages. We explored the barriers and facilitators in HIV care linkage and retention among newly diagnosed older persons living with HIV (OPLWH) in Malaysia.

    METHODS: We conducted in-depth interviews with OPLWH and focus group discussions with health care providers (HCPs) from 5 specialties (primary care medicine, psychological medicine, gynecology, geriatrics, and infectious disease) at a tertiary hospital between September 2021 and April 2022. All sessions were audio-recorded, transcribed verbatim, and analyzed thematically.

    RESULTS: We recruited 16 OPLWH and 7 HCPs. Thirteen OPLWH were male. Eight of them self-identified as men who have sex with men, and the rest were heterosexual. Diagnosis of HIV was between the ages of 50 and 61 years. Barriers and facilitators could be categorized into 3 levels: individual, interpersonal, and institutional. Individual barriers included misinformation about HIV treatment, unable to afford HIV-related services, and belief that life was futile. Interpersonal barriers were HIV-related stigma, poor social and family support, and social prejudice toward men who have sex with men. Lastly, institutional barriers were the need for frequent hospital visits, high cost for HIV-related services, a lack of guidance after diagnosis, and poor communication with HCPs. Facilitators included doctor or friend support and positive institutional reputation.

    CONCLUSIONS: Multiple challenges hindered optimal care for OPLWH after HIV diagnosis. Issues like high costs, belief that treatment is futile, and a lack of family support need to be addressed as part of long-term support services for OPLWH.

    MeSH terms: Aged; Female; Health Personnel/psychology; Health Services Accessibility; Humans; Interviews as Topic; Malaysia; Male; Middle Aged; Patient Acceptance of Health Care; Focus Groups*; Qualitative Research*; Social Stigma*
  4. Rajasegaran S, Ahmad NA, Tan SK, Lechmiannandan A, Tan YW, Sanmugam A, et al.
    Pediatr Surg Int, 2024 Jul 24;40(1):209.
    PMID: 39046543 DOI: 10.1007/s00383-024-05792-z
    PURPOSE: Down syndrome (DS) is a common abnormality associated with anorectal malformation (ARM) and Hirschsprung's disease (HD). However, quality of life (QOL) in ARM and HD patients with DS is under-researched. This study compares parent-reported QOL and bowel function in ARM and HD patients with DS to those without.

    METHODS: Between December 2020 to February 2023, parents of ARM and HD patients with and without DS aged 3-17 years who had undergone surgery > 12 months prior at four tertiary referral centers were recruited. We used the Pediatric Quality of Life Inventory™ (PedsQL™) Generic Core Scales, General Well-Being (GWB) Scale and Family Impact (FI) Module questionnaires, and the Rintala bowel function score (BFS).

    RESULTS: There were 101 ARM, 9 (8.9%) of whom had DS; and 87 HD, of whom 6 (6.9%) had DS. Parent-reported Core scores in ARM and HD with DS were comparable to those without DS. However, ARM and HD with DS had worse scores in the FI Module and bowel function than those without DS.

    CONCLUSION: Although parent-reported QOL in ARM and HD with DS is similar to those without DS, family impact and BFS are worse. Our findings are limited by small sample size in proportion of DS patients.

    MeSH terms: Adolescent; Child; Child, Preschool; Cross-Sectional Studies; Female; Humans; Male; Quality of Life*; Surveys and Questionnaires
  5. Lee MW
    Int Ophthalmol, 2024 Jul 24;44(1):334.
    PMID: 39046597 DOI: 10.1007/s10792-024-03247-x
    PURPOSE: To evaluate the clinical outcomes following bilateral implantation of the AcrySof™ IQ Vivity™ toric extended depth of focus (EDOF) intraocular lens (IOL).

    DESIGN: Prospective interventional case series.

    METHODS: Patients with bilateral significant cataracts and pre-existing corneal astigmatism underwent cataract surgery and implantation with the AcrySof™ IQ Vivity™ toric IOL. Dominant eyes were targeted at emmetropia and non-dominant eyes at -0.50D. Primary endpoints were binocular uncorrected distance (UDVA), intermediate (UIVA at 66 cm) and near (UNVA at 40 cm) acuities at 3 months. Secondary outcomes were corrected distance (CDVA), distance corrected intermediate (DCIVA) and distance corrected near (DCNVA), refractive predictability, rotational stability, binocular defocus curve, contrast sensitivity, Questionnaire for Visual Disturbances (QUVID) and Visual Function Index (VF-14) questionnaire scores. All visual acuities were converted to logarithm of minimum angle of resolution (logMAR) for analysis.

    RESULTS: 30 patients underwent uneventful phacoemulsification. The mean binocular UDVA, UIVA and UNVA were 0.06 ± 0.12, 0.11 ± 0.10 and 0.26 ± 0.10 respectively. The mean refractive spherical equivalent (MRSE) for dominant and non-dominant eyes were - 0.07D ± 0.27 and - 0.12D ± 0.54 respectively. 92.4% of dominant eyes and 84.6% of non-dominant eyes within 0.50D of target. The mean IOL rotation was 3.85° ± 5.09 with 86.7% of eyes with less than 5° of rotation. 26.7%, 20% and 36.7% of patients reported starbursts, haloes and glare respectively. The mean VF-14 score was 91.77.

    CONCLUSION: Bilateral implantation of the AcrySof™ IQ Vivity™ Toric IOL resulted in very good unaided visual acuities for far and intermediate distance with functional near vision. Dysphotopsias were reported but despite this, a high level of visual function was achieved.

    MeSH terms: Aged; Aged, 80 and over; Astigmatism/physiopathology; Astigmatism/surgery; Cataract/complications; Cataract/physiopathology; Depth Perception/physiology; Female; Humans; Lenses, Intraocular*; Male; Middle Aged; Prospective Studies; Prosthesis Design; Refraction, Ocular/physiology; Visual Acuity*; Treatment Outcome
  6. Kermansaravi M, Chiappetta S, Shikora SA, Musella M, Kow L, Aarts E, et al.
    Obes Surg, 2024 Jul 24.
    PMID: 39046625 DOI: 10.1007/s11695-024-07395-y
    PURPOSE: With the global epidemic of obesity, the importance of metabolic and bariatric surgery (MBS) is greater than ever before. Performing these surgeries requires academic training and the completion of a dedicated fellowship training program. This study aimed to develop guidelines based on expert consensus using a modified Delphi method to create the criteria for metabolic and bariatric surgeons that must be mastered before obtaining privileges to perform MBS.

    METHODS: Eighty-nine recognized MBS surgeons from 42 countries participated in the Modified Delphi consensus to vote on 30 statements in two rounds. An agreement/disagreement among ≥ 70.0% of the experts was regarded to indicate a consensus.

    RESULTS: Consensus was reached on 29 out of 30 statements. Most experts agreed that before getting privileges to perform MBS, surgeons must hold a general surgery degree and complete or have completed a dedicated fellowship training program. The experts agreed that the learning curves for the various operative procedures are approximately 25-50 operations for the LSG, 50-75 for the OAGB, and 75-100 for the RYGB. 93.1% of experts agreed that MBS surgeons should diligently record patients' data in their National or Global database.

    CONCLUSION: MBS surgeons should have a degree in general surgery and have been enrolled in a dedicated fellowship training program with a structured curriculum. The learning curve of MBS procedures is procedure dependent. MBS surgeons must demonstrate proficiency in managing postoperative complications, collaborate within a multidisciplinary team, commit to a minimum 2-year patient follow-up, and actively engage in national and international MBS societies.

  7. Leighl NB, Akamatsu H, Lim SM, Cheng Y, Minchom AR, Marmarelis ME, et al.
    J Clin Oncol, 2024 Oct 20;42(30):3593-3605.
    PMID: 38857463 DOI: 10.1200/JCO.24.01001
    PURPOSE: Phase III studies of intravenous amivantamab demonstrated efficacy across epidermal growth factor receptor (EGFR)-mutated advanced non-small cell lung cancer (NSCLC). A subcutaneous formulation could improve tolerability and reduce administration time while maintaining efficacy.

    PATIENTS AND METHODS: Patients with EGFR-mutated advanced NSCLC who progressed after osimertinib and platinum-based chemotherapy were randomly assigned 1:1 to receive subcutaneous or intravenous amivantamab, both combined with lazertinib. Coprimary pharmacokinetic noninferiority end points were trough concentrations (Ctrough; on cycle-2-day-1 or cycle-4-day-1) and cycle-2 area under the curve (AUCD1-D15). Key secondary end points were objective response rate (ORR) and progression-free survival (PFS). Overall survival (OS) was a predefined exploratory end point.

    RESULTS: Overall, 418 patients underwent random assignment (subcutaneous group, n = 206; intravenous group, n = 212). Geometric mean ratios of Ctrough for subcutaneous to intravenous amivantamab were 1.15 (90% CI, 1.04 to 1.26) at cycle-2-day-1 and 1.42 (90% CI, 1.27 to 1.61) at cycle-4-day-1; the cycle-2 AUCD1-D15 was 1.03 (90% CI, 0.98 to 1.09). ORR was 30% in the subcutaneous and 33% in the intravenous group; median PFS was 6.1 and 4.3 months, respectively. OS was significantly longer in the subcutaneous versus intravenous group (hazard ratio for death, 0.62; 95% CI, 0.42 to 0.92; nominal P = .02). Fewer patients in the subcutaneous group experienced infusion-related reactions (IRRs; 13% v 66%) and venous thromboembolism (9% v 14%) versus the intravenous group. Median administration time for the first infusion was reduced to 4.8 minutes (range, 0-18) for subcutaneous amivantamab and to 5 hours (range, 0.2-9.9) for intravenous amivantamab. During cycle-1-day-1, 85% and 52% of patients in the subcutaneous and intravenous groups, respectively, considered treatment convenient; the end-of-treatment rates were 85% and 35%, respectively.

    CONCLUSION: Subcutaneous amivantamab-lazertinib demonstrated noninferiority to intravenous amivantamab-lazertinib, offering a consistent safety profile with reduced IRRs, increased convenience, and prolonged survival.

    MeSH terms: Acrylamides/administration & dosage; Adult; Aged; Aged, 80 and over; Female; Humans; Injections, Subcutaneous; Male; Middle Aged; Mutation*; Administration, Intravenous
  8. Nair Narayanan D, Awang S, Agins B, Mohd Ujang IR, Zulkifli NW, Hamidi N, et al.
    Int J Qual Health Care, 2024 Jul 23;36(3).
    PMID: 38943635 DOI: 10.1093/intqhc/mzae063
    Ensuring quality in healthcare calls for a coordinated, systematic, congruous, and sustained approach. Nevertheless, it demands defining what the quality of healthcare means in the local context. Presently, the Malaysian healthcare system utilizes various definitions of quality of healthcare across the different initiatives and levels of healthcare, which can lead to fragmented or ineffective quality improvement. The study aims to describe the process undertaken in developing an explicit definition of the quality of healthcare tailored to the Malaysian context, which is currently lacking. A pluralistic method was used to explore the different perspectives. Three distinct approaches were used to understand how quality is defined among the different stakeholder groups: (i) interactive policy-makers engagement sessions, (ii) a review of local quality-related documents, and (iii) an online survey engaging the public. The domains depicting quality of healthcare that emerged through these three approaches were mapped against a framework and synthesized to form the local definition of quality. A national quality-related technical working group convened on several sessions to achieve consensus and finalize the definition of quality of healthcare. Quality healthcare in Malaysia is defined as providing high-quality healthcare that is safe, timely, effective, equitable, efficient, people-centred, and accessible [STEEEPA] which is innovative and responsive to the needs of the people, and is delivered as a team, in a caring and professional manner in order to improve health outcomes and client experience. The consensus-driven local definition of healthcare quality will guide policies and ensure standardization in measuring quality, thereby steering efforts to improve the quality of healthcare services delivered in Malaysia.
    MeSH terms: Health Policy; Humans; Malaysia; Surveys and Questionnaires; Quality Improvement
  9. Manaf H, Hamzaid NA, Hasnan N, Yiwei C, Mohafez H, Hisham H, et al.
    Artif Organs, 2024 Jul 23.
    PMID: 39041394 DOI: 10.1111/aor.14831
    BACKGROUND: Consequences of spinal cord injury (SCI) with a sedentary lifestyle will progress to muscle weakness and muscle atrophy, leading to muscle fatigue. This study aimed to determine the feasibility and preliminary effects of high-intensity interval training (HIIT) using functional electrical stimulation (FES) cycling on changes in thigh muscle volume and muscle strength, in patients with incomplete SCI.

    METHODS: Eight incomplete SCI patients (mean age 50 years; 6 women) with stable SCI paraplegia (mean 6.75 years since injury) participated in the HIIT FES cycling (85%-90% peak Watts; 4 × 4-min intervals) three times a week (over 6 weeks). The main outcomes were adherence, participant acceptability, and adverse events. Secondary outcomes were muscle strength (peak torque) and leg volume changes.

    RESULTS: Our findings revealed that the program was well-received by participants, with high levels of adherence, positive feedback, and satisfaction, suggesting that it could be a promising option for individuals seeking to enhance their lower body strength and muscle mass. Additionally, all participants successfully completed the training without any serious adverse events, indicating that the program is safe for use. Finally, we found that the 6-week HIIT FES leg cycling exercise program resulted in notable improvements in isometric peak torque of the quadriceps (range 13.9%-25.6%), hamstring muscle (18.2%-23.3%), and leg volume (1.7%-18.2%).

    CONCLUSIONS: This study highlights HIIT FES leg cycling exercise program potential as an effective intervention for improving lower limb muscle function.

  10. Lee KW, Khan AHKY, Ching SM, Kumar SJ, Raj CLVP, Chia PK, et al.
    Neurol India, 2024 May 01;72(3):476-486.
    PMID: 39041960 DOI: 10.4103/neuroindia.NI_981_20
    BACKGROUND: Anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis is a severe autoimmune encephalitis due to immune production of anti-NMDAR antibodies against the NR1 subunit of the NMDA receptor which is present throughout the central nervous system. This condition had been reported to be prevalent in patients with certain medical conditions; however so far, there have been limited systematic reviews and meta-analyses on the prevalence and factors associated.

    OBJECTIVE: This study was to determine the prevalence and factors associated with anti-NMDAR encephalitis among affected patients.

    MATERIAL AND METHODS: The protocol of this study has been registered (2019: CRD42019142002) with the International Prospective Register of Systematic Reviews (PROSPERO). The primary outcome was the incidence or prevalence of anti-NMDAR encephalitis and secondary outcomes were factors associated with anti-NMDAR encephalitis.

    RESULTS: There were 11 studies and a total of 873 million patients taken from high-risk populations across 11 countries that were included in the primary analysis. The overall pooled prevalence of anti-NMDAR encephalitis among patients with medical conditions was 7.0% (95% CI = 4.4, 9.6). Those with first episode of psychosis or schizophrenia were at a higher risk of developing anti-NMDAR encephalitis with an odds ratio of 5.976 (95% CI = 1.122, 31.825).

    CONCLUSION: We found that almost one-tenth of patients with medical conditions had anti-NMDAR encephalitis; particularly those with first episode of psychosis or schizophrenia were among the high-risk medical conditions.

    MeSH terms: Humans; Prevalence; Receptors, N-Methyl-D-Aspartate/immunology
  11. Dhanasekaran S, Selvadoss PP, Manoharan SS, Jeyabalan S, Yaraguppi DA, Choudhury AA, et al.
    Cell Biochem Biophys, 2024 Jul 23.
    PMID: 39042185 DOI: 10.1007/s12013-024-01359-w
    Chronic hepatitis caused by the hepatitis C virus (HCV) is closely linked with the advancement of liver disease. The research hypothesis suggests that the NS5B enzyme (non-structural 5B protein) of HCV plays a pivotal role in facilitating viral replication within host cells. Hence, the objective of the present investigation is to identify the binding interactions between the structurally diverse phytotherapeutics and those of the catalytic residue of the target NS5B polymerase protein. Results of our docking simulations reveal that compounds such as arjunolic acid, sesamin, arjungenin, astragalin, piperic acid, piperidine, piperine, acalyphin, adhatodine, amyrin, anisotine, apigenin, cuminaldehyde, and curcumin exhibit a maximum of three interactions with the catalytic residues (Asp 220, Asp 318, and Asp 319) present on the Hepatitis C virus NS5B polymerase of HCV. Molecular dynamic simulation, particularly focusing on the best binding lead compound, arjunolic acid (-8.78 kcal/mol), was further extensively analyzed using RMSD, RMSF, Rg, and SASA techniques. The results of the MD simulation confirm that the NS5B-arjunolic acid complex becomes increasingly stable from 20 to 100 ns. The orientation of both arjunolic acid and sofosbuvir triphosphate (standard) within the active site was investigated through DCCM, PCA, and FEL analysis, indicating highly stable interactions of the lead arjunolic acid with the catalytic region of the NS5B enzyme. The findings of our current investigation suggest that bioactive therapeutics like arjunolic acid could serve as promising candidates for limiting the NS5B polymerase activity of the hepatitis C virus, offering hope for the future of HCV treatment.
  12. Kosai NR, Ali AA, Ghita R, Muthkumaran G, Ali I, Loo GH, et al.
    Obes Surg, 2024 Jul 23.
    PMID: 39042306 DOI: 10.1007/s11695-024-07414-y
    INTRODUCTION: The swallowable intragastric balloon (IGB) has recently emerged as a popular alternative for weight loss in Malaysia. It can reduce total body weight loss (TBWL) by 6-15%. We aim to observe positive weight loss up to a year after the swallowable IGB is implanted.

    METHODS: A total of 486 consecutive patients with overweight or obesity who underwent swallowable IGB insertion were included in this prospective data collection.

    RESULTS: Out of 486 patients, 404 patients (83%) had complete data at the end of 4 and 12 months. Patients included in the study had a starting mean body mass index of 35.3 ± 7.2 kg/m2 which decreased to 31.5 ± 5.7 kg/m2 (p 

  13. Hayrapetyan A, Tumasyan A, Adam W, Andrejkovic JW, Bergauer T, Chatterjee S, et al.
    Phys Rev Lett, 2024 Jul 05;133(1):011801.
    PMID: 39042800 DOI: 10.1103/PhysRevLett.133.011801
    The first search for singly produced narrow resonances decaying to three well-separated hadronic jets is presented. The search uses proton-proton collision data corresponding to an integrated luminosity of 138  fb^{-1} at sqrt[s]=13  TeV, collected at the CERN LHC. No significant deviations from the background predictions are observed between 1.75 and 9.00 TeV. The results provide the first mass limits on a right-handed boson Z_{R} decaying to three gluons and on an excited quark decaying via a vector boson to three quarks, as well as updated limits on a Kaluza-Klein gluon decaying via a radion to three gluons.
  14. Bhargava V, Meena P, Agrawaal KK, Wijayaratne D, Kar S, Qayyum A, et al.
    Perit Dial Int, 2024 Jul 23.
    PMID: 39042940 DOI: 10.1177/08968608241263396
    Peritoneal dialysis (PD) is a well-established modality for kidney replacement therapy (KRT) globally, offering benefits such as better preservation of residual kidney function, improved quality of life, and reduced resource requirements. Despite these advantages, the global utilization of PD remains suboptimal, particularly in South Asia (SA), where a significant gap in PD delivery exists. This study aims to uncover the perceived barriers hindering PD utilization among nephrologists in SA. This is a cross-sectional survey involving 732 nephrologists from SA region. . The majority of respondents (44.7%) reported initiating less than six PD cases annually, reflecting low PD utilization. Cost and financial reimbursement policies emerged as major barriers, with 44.3% considering PD more expensive than haemodialysis (HD). Accessibility, negative attitudes toward PD, and fear of complications were identified as critical factors influencing PD adoption. The study also highlighted variations in PD costs among SA countries, emphasizing the need for tailored health economic strategies. This analysis provides insights into the multifaceted challenges faced by SA nephrologists in promoting PD and underscores the importance of targeted interventions.
  15. Amira Khairil Anwar N, Najmi Mohd Nazri M, Rosliza Mohd Adzemi E, Amilda Anthony A, Mohd Azlan M, Balakrishnan V, et al.
    Cytokine, 2024 Jul 22;182:156698.
    PMID: 39042994 DOI: 10.1016/j.cyto.2024.156698
    BACKGROUND: Elevated serum levels of soluble PD-L1 (sPD-L1) have been reported in many cancers; however, there is limited data of sPD-L1 in breast cancer, especially those representing Asian (Malay) women. The purpose of this study was to evaluate sPD-L1 serum levels and analyze its correlation with clinical characteristics in breast cancer patients at Hospital Universiti Sains Malaysia (HUSM).

    METHODS: Blood specimens were obtained from 92 malignant, 16 benign breast cancer patients and 23 healthy controls. The serum concentrations of sPD-L1 were assessed by enzyme-linked immunosorbent assay (ELISA).

    RESULTS: The median serum sPD-L1 concentration of malignant and benign breast cancer patients was significantly elevated compared to the healthy cohorts (12.50 ng/mL vs 13.97 ng/mL vs 8.75 ng/mL, p 

  16. Gulshan S, Shafaghat H, Wang S, Dai L, Tang C, Fu W, et al.
    Waste Manag, 2024 Jul 22;187:156-166.
    PMID: 39043078 DOI: 10.1016/j.wasman.2024.07.015
    Waste electrical and electronic equipment (WEEE) has become a critical environmental problem. Catalytic pyrolysis is an ideal technique to treat and convert the plastic fraction of WEEE into chemicals and fuels. Unfortunately, research using real WEEE remains relatively limited. Furthermore, the complexity of WEEE complicates the analysis of its pyrolytic kinetics. This study applied the Fraser-Suzuki mathematical deconvolution method to obtain the pseudo reactions of the thermal degradation of two types of WEEE, using four different catalysts (Al2O3, HBeta, HZSM-5, and TiO2) or without a catalyst. The main contributor(s) to each pseudo reaction were identified by comparing them with the pyrolysis results of the pure plastics in WEEE. The nth order model was then applied to estimate the kinetic parameters of the obtained pseudo reactions. In the low-grade electronics pyrolysis, the pseudo-1 reaction using TiO2 as a catalyst achieved the lowest activation energy of 92.10 kJ/mol, while the pseudo-2 reaction using HZSM-5 resulted in the lowest activation energy of 101.35 kJ/mol among the four catalytic cases. For medium-grade electronics, pseudo-3 and pseudo-4 were the main reactions for thermal degradation, with HZSM-5 and TiO2 yielding the lowest pyrolytic activation energies of 75.24 and 226.39 kJ/mol, respectively. This effort will play a crucial role in comprehending the pyrolysis kinetic mechanism of WEEE and propelling this technology toward a brighter future.
  17. Loke YH, Phang HC, Mohamad N, Kee PE, Chew YL, Lee SK, et al.
    Planta Med, 2024 Sep;90(11):824-833.
    PMID: 39043195 DOI: 10.1055/a-2359-8097
    For decades, cocoa butter has been extensively used in food industries, particularly in the production of chocolate confectioneries. The composition of fats within cocoa butter, such as stearic acid, palmitic acid, and oleic acid, determines its properties. Studies have indicated the existence of at least six polymorphic forms of cocoa butter, each possessing distinct characteristics and melting points. Recently, cocoa butter has garnered attention for its potential as a delivery system for pharmaceutical products. This review thoroughly explores cocoa butter, encompassing its production process, composition, properties, and polymorphism. It delves into its diverse applications across various industries including food, cosmetics, and pharmaceuticals. Additionally, the review investigates cocoa butter alternatives aiming to substitute cocoa butter and their roles in different drug delivery systems. The unique properties of cocoa butter have sparked interest in pharmaceutical industries, particularly since its introduction as a drug delivery system and excipient. This has prompted researchers and industry stakeholders to explore novel formulations and delivery methods, thereby expanding the range of options available to consumers in the pharmaceutical market.
    MeSH terms: Dietary Fats/analysis; Humans; Drug Delivery Systems*
  18. Jadhav P, Bhuyar P, Misnon II, Rahim MHA, Roslan R
    Int J Biol Macromol, 2024 Sep;276(Pt 2):134061.
    PMID: 39043289 DOI: 10.1016/j.ijbiomac.2024.134061
    The conversion of lignin into bioactive compounds through selective organic synthesis methods represents a promising frontier in the pursuit of sustainable raw materials and green chemistry. This review explores the versatility of lignin-derived bioactive compounds, ranging from their application in drug discovery to their role in the development of biodegradable materials. Despite notable advancements, the synthesis routes and yields of highly bioactive molecules from lignin still require further exploration and improvement. This review provides an in-depth examination of the progress made in understanding the complex structure of lignin and developing innovative approaches to exploit its potential. Specifically, the types of lignins covered include softwood Kraft lignin, hardwood organosolv lignin, and soda lignin. This work is divided into three parts: first, the transformation of lignin into bioactive molecules with chemically active centres and functionalised hydroxyl groups through depolymerisation; second, kinetic modelling techniques essential for understanding the chemical kinetics of lignin and enabling significant scaling up in the conversion of organic molecules; third, efficient catalytic pathways for synthesising molecules with anticancer and antibacterial properties. In conclusion, this comprehensive review spurs further investigations into lignin-derived bioactive compounds, their applications, and the advancement of sustainable processes.
    MeSH terms: Antineoplastic Agents/chemical synthesis; Antineoplastic Agents/pharmacology; Antineoplastic Agents/chemistry; Humans; Kinetics; Polymerization; Chemistry Techniques, Synthetic
  19. Wong PC, Abdullah SS, Shapiai MI
    Sci Rep, 2024 Jul 24;14(1):17037.
    PMID: 39043757 DOI: 10.1038/s41598-024-66874-5
    The classification of Alzheimer's disease (AD) using deep learning models is hindered by the limited availability of data. Medical image datasets are scarce due to stringent regulations on patient privacy, preventing their widespread use in research. Moreover, although open-access databases such as the Open Access Series of Imaging Studies (OASIS) are available publicly for providing medical image data for research, they often suffer from imbalanced classes. Thus, to address the issue of insufficient data, this study proposes the integration of a generative adversarial network (GAN) that can achieve comparable accuracy with a reduced data requirement. GANs are unsupervised deep learning networks commonly used for data augmentation that generate high-quality synthetic data to overcome data scarcity. Experimental data from the OASIS database are used in this research to train the GAN model in generating synthetic MRI data before being included in a pretrained convolutional neural network (CNN) model for multistage AD classification. As a result, this study has demonstrated that a multistage AD classification accuracy above 80% can be achieved even with a reduced dataset. The exceptional performance of GANs positions them as a solution for overcoming the challenge of insufficient data in AD classification.
    MeSH terms: Female; Humans; Magnetic Resonance Imaging/methods; Male; Databases, Factual; Neural Networks (Computer)*
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