Browse publications by year: 2024

  1. Priya AK, Muruganandam M, Suresh S
    Chemosphere, 2024 Jun 29;362:142731.
    PMID: 38950744 DOI: 10.1016/j.chemosphere.2024.142731
    Biosynthesized nanocomposites, particularly those incorporating carbon-based materials, exhibit exceptional tunability and multifunctionality, surpassing the capabilities of conventional materials in these aspects. Developing practical solutions is critical to address environmental toxins from pharmaceuticals, heavy metals, pesticides, and dyes. Biomass waste is a readily available carbon source, which emerges as a promising material for producing biochar due to its inherent advantages: abundance, low cost, and environmentally friendly nature. This distribution mainly uses carbon-based materials (CBMs) and biomass waste in wastewater treatment. This review paper investigates several CBM types, including carbon aerogels, nanotubes, graphene, and activated carbon. The development of bio-derived carbon-based nanomaterials are discussed, along with the properties and composition of carbon materials derived from biomass waste and various cycles, such as photodegradation, adsorption, and high-level oxidation processes for natural remediation. In conclusion, this review examines the challenges associated with biochar utilization, including cost, recovery, and practical implementation.
  2. Suresh V, Magoon R
    Neurocrit Care, 2024 Aug;41(1):303-304.
    PMID: 38951445 DOI: 10.1007/s12028-024-02025-y
    MeSH terms: Humans; Intracranial Hypertension/diagnosis; Intracranial Hypertension/physiopathology
  3. Thiagarajan JD, Kulkarni SV, Jadhav SA, Waghe AA, Raja SP, Rajagopal S, et al.
    Sci Rep, 2024 Jul 01;14(1):15041.
    PMID: 38951552 DOI: 10.1038/s41598-024-63930-y
    The Indian economy is greatly influenced by the Banana Industry, necessitating advancements in agricultural farming. Recent research emphasizes the imperative nature of addressing diseases that impact Banana Plants, with a particular focus on early detection to safeguard production. The urgency of early identification is underscored by the fact that diseases predominantly affect banana plant leaves. Automated systems that integrate machine learning and deep learning algorithms have proven to be effective in predicting diseases. This manuscript examines the prediction and detection of diseases in banana leaves, exploring various diseases, machine learning algorithms, and methodologies. The study makes a contribution by proposing two approaches for improved performance and suggesting future research directions. In summary, the objective is to advance understanding and stimulate progress in the prediction and detection of diseases in banana leaves. The need for enhanced disease identification processes is highlighted by the results of the survey. Existing models face a challenge due to their lack of rotation and scale invariance. While algorithms such as random forest and decision trees are less affected, initially convolutional neural networks (CNNs) is considered for disease prediction. Though the Convolutional Neural Network models demonstrated impressive accuracy in many research but it lacks in invariance to scale and rotation. Moreover, it is observed that due its inherent design it cannot be combined with feature extraction methods to identify the banana leaf diseases. Due to this reason two alternative models that combine ANN with scale-invariant Feature transform (SIFT) model or histogram of oriented gradients (HOG) combined with local binary patterns (LBP) model are suggested. The first model ANN with SIFT identify the disease by using the activation functions to process the features extracted by the SIFT by distinguishing the complex patterns. The second integrate the combined features of HOG and LBP to identify the disease thus by representing the local pattern and gradients in an image. This paves a way for the ANN to learn and identify the banana leaf disease. Moving forward, exploring datasets in video formats for disease detection in banana leaves through tailored machine learning algorithms presents a promising avenue for research.
    MeSH terms: Machine Learning*; Algorithms; Plant Diseases*; Neural Networks (Computer)*; Plant Leaves*; Musa*
  4. Hocquet A, Wieber F, Gramelsberger G, Hinsen K, Diesmann M, Pasquini Santos F, et al.
    Nat Comput Sci, 2024 Jul;4(7):465-468.
    PMID: 38951645 DOI: 10.1038/s43588-024-00651-2
  5. Tan SP, Bashirudin SB, Rajaratnam RK, Gan F
    BMC Pregnancy Childbirth, 2024 Jul 01;24(1):455.
    PMID: 38951754 DOI: 10.1186/s12884-024-06650-5
    BACKGROUND: The rates of labor induction and cesarean delivery is rising worldwide. With the confluence of these trends, the labor induction rate in trials of labor after cesarean can be as high as 27-32.7%. Induction of labor after one previous cesarean (IOLAC) is a high-risk procedure mainly due to the higher risk of uterine rupture. Nevertheless, the American College of Obstetricians and Gynecologists considers IOLAC as an option in motivated and informed women in the appropriate care setting. We sought to identify predictors of a composite of maternal and newborn adverse outcomes following IOLAC.

    METHODS: The electronic medical records of women who delivered between January 2018 to September 2022 in a Malaysian university hospital were screened to identify cases of IOLAC. A case is classified as a composite adverse outcome if at least one of these 11 adverse outcomes of delivery blood loss ≥ 1000 ml, uterine scar complications, cord prolapse or presentation, placenta abruption, maternal fever (≥ 38 0C), chorioamnionitis, intensive care unit (ICU) admission, Apgar score 

    MeSH terms: Administration, Intravaginal; Adult; Cesarean Section/statistics & numerical data; Female; Humans; Infant, Newborn; Malaysia/epidemiology; Oxytocics/administration & dosage; Oxytocics/adverse effects; Oxytocics/therapeutic use; Pregnancy; Pregnancy Outcome/epidemiology; Retrospective Studies; Risk Factors
  6. Wu J, Kuan G, Wang Y, Liu Z, Hu X, Kueh YC, et al.
    BMC Public Health, 2024 Jun 29;24(1):1738.
    PMID: 38951834 DOI: 10.1186/s12889-024-18842-x
    Research indicates that COVID-19 has had adverse effects on the mental health of adolescents, exacerbating their negative psychological states. The purpose of this study is to investigate the impact of Physical Literacy (PL) on Negative Mental State caused by COVID-19 (NMSC) and identify potential factors related to NMSC and PL in Chinese adolescents. This cross-sectional study involved a total of 729 Chinese high school students with an average age of 16.2 ± 1.1 years. Participants' demographic data, PL data, and NMSC data were collected. PL and NMSC were measured using the self-reported Portuguese Physical Literacy Assessment Questionnaire (PPLA-Q), the Stress and Anxiety to Viral Epidemics-6 (SAVE-6), and the Fear of COVID-19 Scale (FCV-19). Adolescents in the current study demonstrated higher levels of NMSC and lower PL, with average scores of 3.45 and 2.26, respectively (on a scale of 5). Through multiple linear regression analysis, Motivation (MO), Confidence (CO), Emotional Regulation (ER), and Physical Regulation (PR) were identified as factors influencing NMSC in adolescents. The study findings contribute to providing guidance for actions aimed at alleviating NMSC among adolescents.
    MeSH terms: Adolescent; China/epidemiology; Cross-Sectional Studies; Female; Humans; Male; Mental Health; Surveys and Questionnaires; Resilience, Psychological*; Health Literacy/statistics & numerical data
  7. Tan JY, Tan CY, Gengadharan PN, Shahrizaila N, Goh KJ
    J Clin Neurol, 2024 Jul;20(4):412-421.
    PMID: 38951974 DOI: 10.3988/jcn.2023.0285
    BACKGROUND AND PURPOSE: Myasthenia gravis (MG) is clinically heterogeneous and can be classified into subgroups according to the clinical presentation, antibody status, age at onset, and thymic abnormalities. This study aimed to determine the clinical characteristics and outcomes of generalized MG (GMG) patients based on these subgroups.

    METHODS: Medical records of MG patients from 1976 to 2023 were reviewed retrospectively. Patients with pure ocular MG were excluded. Data on demographic, clinical characteristics, laboratory features, and outcomes were analyzed.

    RESULTS: This study included 120 GMG patients. There was a slight preponderance of female patients over male patients (male:female ratio=1:1.3), with the age at onset exhibiting a bimodal distribution. Female patients peaked at a lower age (21-30 years) whereas male patients peaked at a higher age (61-70 years). Most (92%, 105 of 114) patients had positive anti-acetylcholine receptor antibodies. Five patients were also tested for anti-muscle-specific tyrosine kinase antibodies, with two showing positivity. Thymectomy was performed in 62 (52%) patients, of which 30 had thymoma, 16 had thymic hyperplasia, 7 had an involuted thymus, and 6 had a normal thymus. There were significantly more female patients (68% vs. 45%, p=0.011) with early-onset disease (<50 years old) and thymic hyperplasia (33% vs. 0%, p<0.025). Most (71%) of the patients had a good outcome based on the Myasthenia Gravis Foundation of America postintervention status. GMG patients with early-onset disease had a significantly better outcome than patients with a late onset in univariate (58% vs. 37%, p=0.041) and multivariate (odds ratio=4.68, 95% confidence interval=1.17-18.64, p=0.029) analyses.

    CONCLUSIONS: Female patients with early-onset MG and thymic hyperplasia had significantly better outcomes, but only early-onset disease was independently associated with a good outcome. These findings are comparable with those of other studies.

  8. Schee JP, Tan JS, Tan CY, Shahrizaila N, Wong KT, Goh KJ
    J Clin Neurol, 2024 Jul;20(4):422-430.
    PMID: 38951975 DOI: 10.3988/jcn.2023.0265
    BACKGROUND AND PURPOSE: Multiple acyl-CoA dehydrogenase deficiency (MADD) is an inherited disorder of fatty acid oxidation that causes lipid storage myopathy (LSM). This is the first report on MADD that describes the phenotypic and genetic features of a Malaysian cohort.

    METHODS: Among the >2,500 patients in a local muscle biopsy database, patients with LSM were identified and their genomic DNA were extracted from muscle samples and peripheral blood. All 13 exons of the electron-transfer flavoprotein dehydrogenase gene (ETFDH) were subsequently sequenced. Fifty controls were included to determine the prevalence of identified mutations in the normal population.

    RESULTS: Fourteen (82%) of the 17 LSM patients had MADD with ETFDH mutations. Twelve (86%) were Chinese and two were Malay sisters. Other unrelated patients reported that they had no relevant family history. Nine (64%) were females. The median age at onset was 18.5 years (interquartile range=16-37 years). All 14 demonstrated proximal limb weakness, elevated serum creatine kinase levels, and myopathic changes in electromyography. Three patients experienced a metabolic crisis at their presentation. Sanger sequencing of ETFDH revealed nine different variants/mutations, one of which was novel: c.998A>G (p.Y333C) in exon 9. Notably, 12 (86%) patients, including the 2 Malay sisters, carried a common c.250G>A (p.A84T) variant, consistent with the hotspot mutation reported in southern China. All of the patients responded well to riboflavin therapy.

    CONCLUSIONS: Most of our Malaysian cohort with LSM had late-onset, riboflavin-responsive MADD with ETFDH mutations, and they demonstrated phenotypic and genetic features similar to those of cases reported in southern China. Furthermore, we report a novel ETFDH mutation and possibly the first ever MADD patients of Malay descent.

  9. Sharan J, Bajoria A, Jena AK, Sinha P, Shivakumar A, Kamal VK, et al.
    Turk J Orthod, 2024 Jun 30;37(2):104-111.
    PMID: 38952284 DOI: 10.4274/TurkJOrthod.2023.2023.14
    OBJECTIVE: To evaluate the infrazygomatic crest (IZC) bone and develop guidelines for the optimum placement of orthodontic miniscrew implants (OMSIs) along the distobuccal root of the permanent maxillary first molar.

    METHODS: Bone thickness of the IZC region of 50 young adults (25 males and 25 females) aged 18-30 years were evaluated using cone-beam computed tomography images. The infrazygomatic bone thickness along the distobuccal root of the permanent maxillary first molar was assessed at various insertion angles (40° to 75° i.r.t the maxillary occlusal plane) with an increment of 5°. Student's t-test was used to compare the IZC bone thickness and height at the orthodontic miniscrew insertion site for males and females on the right and left sides.

    RESULTS: The bone thickness of the IZC region above the distobuccal root of the permanent maxillary first molar was estimated between 4.39±0.25 mm and 9.03±0.45 mm for insertion angles from 40° to 75° to the maxillary occlusal plane. The corresponding OMSI insertion heights were 17.71±0.61 mm to 13.69±0.75 mm, respectively, above the maxillary occlusal plane. There were statistically significant gender and side-wise variations in bone thickness at the IZC area and insertion height.

    CONCLUSION: The safe position for OMSI placement at the IZC was 13.69-16 mm from the maxillary occlusal plane with an insertion angle between 55° and 75°. These parameters provide the optimum placement of OMSIs along the distobuccal root of the permanent maxillary first molar.

  10. Chong E, Goh EF, Lim WS
    Ann Geriatr Med Res, 2024 Dec;28(4):401-409.
    PMID: 38952333 DOI: 10.4235/agmr.24.0091
    BACKGROUND: Functional dependency may serve as a marker for positive SARC-F screen (Strength, Assistance with walking, Rise from a chair, Climb stairs and Falls) among older adults at the Emergency Department (ED). We compared functional dependency between SARC-F- (<4) and SARC-F+ (≥4) groups at the ED.

    METHODS: A secondary analysis of cohorts from two quasi-experimental studies among patients aged ≥65 years old presenting to the ED of a 1,700-bed tertiary hospital. We compared both groups for baseline characteristics using univariate analyses, and performed multiple linear regression to examine the association between Modified Barthel Index (MBI) and Lawton's instrumental activities of daily living (IADL) against SARC-F, and binary logistic regression to examine the associations between individual ADL domains and SARC-F+. We compared the area under receiver operating characteristic curves (AUC) to detect SARC-F+ for MBI, IADL, frailty, age, cognition and comorbidity.

    RESULTS: SARC-F+ patients were older (86.4±7.6 years), predominantly female (71.5%) and frail (73.9%), more dependent on walking aids (77.2%), and had lower premorbid MBI (median 90.0 [interquartile range 71.0-98.0]) and IADL (4.0 [2.0-5.0]) (both p<0.001). MBI (β=-0.07, 95% confidence interval [CI] -0.086 to -0.055) and IADL (β=-0.533, 95% CI -0.684 to -0.381) were significantly associated with SARC-F. Dependency in finances (odds ratio [OR]=14.7, 95% CI 3.57-60.2, p<0.001), feeding (OR=12.4, 95% CI 1.45-106, p=0.022), and stair-climbing (OR=10.49, 95% CI 4.96-22.2, p<0.001) were the top three functional items associated with SARC-F. MBI (AUC=0.82, 95% CI 0.77-0.84) and IADL (AUC=0.78, 95% CI 0.72-0.84) showed superior discrimination for SARC-F+ compared to other measures (AUC=0.58-0.70).

    CONCLUSION: Functional dependency is strongly associated with positive SARC-F screen among older adults at the ED. This highlights the need for increased vigilance, especially in the presence of dependency in relevant domains such as managing finances, feeding, and stair-climbing.

    MeSH terms: Accidental Falls/prevention & control; Activities of Daily Living*; Aged; Aged, 80 and over; Female; Humans; Male; Frail Elderly/statistics & numerical data
  11. Abdul Razzak HA, Syed Sulaiman SA, Khan AH, Thomas S
    J Pharm Policy Pract, 2024;17(1):2367018.
    PMID: 38952489 DOI: 10.1080/20523211.2024.2367018
    BACKGROUND: Over the last few decades, the pharmacy profession has witnessed a substantial evolution accompanied by the developing role of community pharmacists (CPs). Evidence indicates that extending the role of CPs contributes to fostering public health outcomes. However, in many countries, their role is still underused. To extend the role of CPs in Oman, it is crucial to understand their perception and determine the influences.

    AIM: This study determines the willingness of CPs in Oman to extend their role and assess their perception towards barriers.

    METHOD: A cross-sectional study was conducted across Oman using an online self-administered survey targeting CPs working in the private sector.

    RESULT: Generally, respondents welcomed broadening their professional role. However, among the top perceived barriers were shortage of staff, insufficient training, lack of interconnection between CPs and physicians, and regulation constraints. Different socio-demographic characteristics of respondents showed a noticeable impact on their responses.

    CONCLUSION: CPs welcomed extending their role. However, several obstacles were raised that need to be tackled to enable CPs to advance their role.

  12. Khan YN, Mahmud MIAM, Othman N, Radzuan HM, Basit S
    Vavilovskii Zhurnal Genet Selektsii, 2024 Jun;28(3):326-331.
    PMID: 38952703 DOI: 10.18699/vjgb-24-37
    Frank-Ter Haar syndrome (FTHS) is a rare genetic hereditary autosomal recessive disorder characterized by defective malformation of cardiovascular, craniofacial, and skeletal system. Mutations in the SH3PXD2B gene are a common cause in the development of FTHS. We recruited a family with two affected individuals (3-year-old female and 2-month-old male infant) having bilateral clubfoot. Family pedigree shows an autosomal recessive mode of inheritance. DNA was extracted from the blood samples of six members of the family. Whole exome sequencing was done for the two affected individuals and the variant was validated in the whole family by using Sanger sequencing approach. Whole exome sequencing (WES) data analysis identified a rare homozygous variant (c.280C>G; p.R94G) in the SH3PXD2B gene, and Sanger sequencing showed that the same variant perfectly segregates with the phenotype in the pedigree. Moreover, the variant is predicted to be damaging and deleterious by several computation tools. Revisiting the family members for detailed clinical analysis, we diagnosed the patients as having the typical phenotype of FTHS. This study enabled us to correctly diagnose the cases of FTHS in a family initially recruited for having bilateral clubfoot by using WES. Moreover, this study identified a novel homozygous missense variant (c.280C>G; p.R94G) in (NM_001308175.2) the SH3PXD2B gene as a causative variant for autosomal recessive FTHS. This finding supports the evidence that homozygous mutations in the SH3PXD2B gene are the main cause in the development of FTHS.
  13. Washif JA, Hébert-Losier K, Gill N, Zainuddin M, Nasruddin NS, Zakaria AZ, et al.
    Biol Sport, 2024 Jul;41(3):231-241.
    PMID: 38952920 DOI: 10.5114/biolsport.2024.133000
    Despite the importance of strength and power in rugby skills and match outcomes, there exists a noticeable gap in the measurement consistency and estimation of a true change of typical assessments designed to assess these qualities. To address this gap, we investigated the between-session reliability, interrelationships, and minimal detectable changes (MDC) of commonly used strength and power measures in team sports. Sixteen national-level rugby 7 s players were tested on two occasions, one week apart. Both the best and average (of 2-3 trials) peak force, peak power, height, distance, and/or strength indices during countermovement jump (CMJ), drop jump (DJ), isometric mid-thigh pull (IMTP), plyometric push-up (PPU), and standing long jump (SLJ) were obtained. Furthermore, one-repetition maximum (1RM) strength for bench press and back squat, reactive strength index, and dynamic strength index were also determined. Reliability was assessed using intraclass correlation coefficients (ICC) and coefficients of variation (CV), and used for MDC calculations, and interrelationships between variables were determined using correlation coefficients. Reliability was excellent for bench press, back squat, and SLJ (ICCs > 0.91); high to excellent for IMTP peak force, all CMJ, and DJ (except best DJ height and contact time), and PPU peak force parameters (ICCs > 0.78), with < 10% CVs (except PPU peak power). MDCs were generally smaller for average than best values. Large to very large relationships (r = 0.60 to 0.85) were observed between bench press, back squat, and IMTP with selected parameters of CMJ and PPU (p < 0.05), but not in DJ and SLJ. In conclusion, selected measures of strength and power displayed high to excellent reproducibility, with average values (rather than best) offering more stable assessments, and "smaller" MDCs. Based upon the relationships, it can be inferred that maximising strength would likely contribute to enhanced explosive performance.
  14. Md Bukhori AB, Ja'afar MH
    PeerJ, 2024;12:e17489.
    PMID: 38952988 DOI: 10.7717/peerj.17489
    BACKGROUND: The COVID-19 pandemic has had tremendous implications for billions of adolescents worldwide due to school closures, forcing students to embrace internet usage for daily tasks. Uncontrolled use of the internet among adolescents makes them vulnerable to internet addiction (IA). This study aims to determine the prevalence of IA among adolescents and assess its association with sociodemographic factors, smartphone use, and psychological distress during the pandemic.

    METHOD: A cross-sectional self-administered online survey was conducted among students aged 13-17 from May 15th, 2021, until May 30th, 2021, using the Malay version of the Internet Addiction Test (MVIAT), the Depression, Anxiety, and Stress Scale (DASS-21), and the Coronavirus Impacts Questionnaires, as well as a sociodemographic information form. The data was analyzed with IBM SPSS Statistics version 23.

    RESULTS: A total of 420 adolescents participated in the survey. The majority of them (70.7%) were female, with a mean age of 15.47 years (±1.49 years old). About 45.5% of the respondents were classified as internet addicted users. The Chi-square test analysis showed that age (p = 0.002), smartphone usage (p = 0.010), rate of midnight use (p

    MeSH terms: Smartphone/statistics & numerical data; Adolescent; Adolescent Behavior/psychology; Anxiety/epidemiology; Anxiety/psychology; Cross-Sectional Studies; Depression/epidemiology; Depression/psychology; Female; Humans; Malaysia/epidemiology; Male; Surveys and Questionnaires; Stress, Psychological/epidemiology; Stress, Psychological/psychology; Prevalence; Pandemics
  15. Ng WL, Tan JK, Gnanaraj C, Shah MD, Nor Rashid N, Abdullah I, et al.
    Nat Prod Res, 2024 Jul 02.
    PMID: 38953123 DOI: 10.1080/14786419.2024.2370521
    The pantropical Physalis minima are traditionally used for the prevention and treatment of various illnesses, diseases, and cancers. While most earlier studies on the species have focused on the phytochemistry of the leaf and stem extracts, recent studies have indicated that its fruit may contain bioactive compounds of medical interest. In this study, we investigated the cytotoxicity of extracts from the fruit of P. minima against colorectal cancer cell lines and revealed its phytochemical profile via high-resolution tandem mass spectrometry analysis. Following a 24-h treatment with the fruit extract, cytoplasm shrinkage and nucleus condensation were observed in the colorectal cancer cell lines HCT116 and HT29, indicating the induction of programmed cell death. Phytochemically, 71 putative metabolites were identified. Some of these metabolites have been reported to inhibit cancers to varying degrees, further supporting the correlation of the putative metabolites with the cytotoxicity against colorectal cancer cells demonstrated in this study.
  16. Retnosari R, Ali AH, Zainalabidin S, Ugusman A, Oka N, Latip J
    Bioorg Med Chem Lett, 2024 Sep 01;109:129826.
    PMID: 38830427 DOI: 10.1016/j.bmcl.2024.129826
    Carvacrol, called CA, is a dynamic phytoconstituent characterized by a phenol ring abundantly sourced from various natural reservoirs. This versatile scaffold serves as a pivotal template for the design and synthesis of novel drug molecules, harboring promising biological activities. The active sites positioned at C-4, C-6, and the hydroxyl group (-OH) of CA offer fertile ground for creating potent drug candidates from a pharmacological standpoint. In this comprehensive review, we delve into diverse synthesis pathways and explore the biological activity of CA derivatives. We aim to illuminate the potential of these derivatives in discovering and developing efficacious treatments against a myriad of life-threatening diseases. By scrutinizing the structural modifications and pharmacophore placements that enhance the activity of CA derivatives, we aspire to inspire the innovation of novel therapeutics with heightened potency and effectiveness.
    MeSH terms: Animals; Humans; Structure-Activity Relationship; Molecular Structure; Monoterpenes/chemical synthesis; Monoterpenes/pharmacology; Monoterpenes/chemistry; Drug Discovery*
  17. Anggraeni VS, Lee HC, Goh PS, Sutrisna PD, Chan EWC, Wong CW
    Biofouling, 2024;40(5-6):348-365.
    PMID: 38836472 DOI: 10.1080/08927014.2024.2357309
    Our research focuses on developing environmentally friendly biodegradable ultrafiltration (UF) membranes for small-scale water purification in areas lacking infrastructure or during emergencies. To address biofouling challenges without resorting to harmful chemicals, we incorporate bio-based extracts, such as methyl gallate from A. occidentale leaves, a Malaysian ulam herb, known for its quorum sensing inhibition (QSI) properties. The methyl gallate enriched extract was purified by solvent partitioning and integrated into cellulose-based UF membranes (0 to 7.5% w w-1) through phase inversion technique. The resulting membranes exhibited enhanced anti-organic fouling and anti-biofouling properties, with flux recovery ratio (FRR) of 87.84 ± 2.00% against bovine serum albumin and FRRs of 76.67 ± 1.89% and 69.57 ± 1.77% against E. coli and S. aureus, respectively. The CA/MG-5 membrane showed a 224% improvement in pure water flux (PWF) compared to the neat CA membrane. Our innovative approach significantly improves PWF, presenting an environmentally friendly method for biofouling prevention in UF membrane applications.
    MeSH terms: Gallic Acid/analogs & derivatives; Gallic Acid/pharmacology; Gallic Acid/chemistry; Membranes, Artificial*; Serum Albumin, Bovine/chemistry; Staphylococcus aureus/drug effects
  18. Arul P, Huang ST, Nandhini C, Huang CH, Gowthaman NSK, Huang CH
    Biosens Bioelectron, 2024 Oct 01;261:116485.
    PMID: 38852323 DOI: 10.1016/j.bios.2024.116485
    Developing quantitative biosensors of superoxide (O2•-) and nitric oxide (NO) anion is crucial for pathological research. As of today, the main challenge for electrochemical detection is to develop high-selectivity nano-mimetic materials to replace natural enzymes. In this study, the dendritic-like morphological structure of silver organic framework (Ag-MOF) was successfully synthesized via a solvothermal strategy. Owing to the introduction of polymeric composites results in improved electrical conductivity and catalytic activity, which promotes mass transfer and leads to faster electron efficiency. For monitoring the electrochemical signals of O2•- and NO, the Ag-MOF electrode substrate was produced by drop-coating, and composites were designed by cyclic voltammetric potential cycles. The designed electrode substrates demonstrate high sensitivity, wide linear concentrations of 1 nM-1000 μM and 1 nM-850 μM, and low detection limits of 0.27 nM and 0.34 nM (S/N = 3) against O2•- and NO. Aside from that, the sensor successfully monitored the cellular release of O2•-, and NO from HepG2 and RAW 264.7 living cells and has the potential to monitor exogenous NO release from donors of Diethylamine (DEA)-NONOate and sodium nitroprusside (SNP). Additionally, the developed system was applied to the analysis of O2•- and NO in real biological fluid samples, and the results were good satisfactory (94.10-99.57 ± 1.23%). The designed system provides a novel approach to obtaining a good electrochemical biosensor platform that is highly selective, stable, and flexible. Finally, the proposed method provides a quantitative way to follow the dynamic changes in O2•- and NO in biological systems.
    MeSH terms: RAW 264.7 Cells; Animals; Catalysis; Humans; Silver/chemistry; Biomarkers/analysis; Nitric Oxide Donors/chemistry; Mice; Hep G2 Cells; Limit of Detection
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