Displaying publications 321 - 340 of 668 in total

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  1. Awadh AI, Hassali MA, Al-lela OQ, Bux SH, Elkalmi RM, Hadi H
    BMC Public Health, 2014;14:1107.
    PMID: 25346471 DOI: 10.1186/1471-2458-14-1107
    Parents are the main decision makers for their children vaccinations. This fact makes parents' immunization knowledge and practices as predictor factors for immunization uptake and timeliness. The aim of this pilot study was to develop a reliable and valid instrument in Malaysian language to measure immunization knowledge and practice (KP) of Malaysian parents.
  2. Hadi MA, Alldred DP, Briggs M, Munyombwe T, Closs SJ
    Clin J Pain, 2014 Nov;30(11):1006-14.
    PMID: 24480911 DOI: 10.1097/AJP.0000000000000063
    OBJECTIVE: To evaluate the effectiveness of pharmacist-led medication review in chronic pain management.

    MATERIALS AND METHODS: Six electronic databases (Medline, Embase, PsycInfo, CINHAL, CENTRAL, International Pharmaceutical Abstracts) reference lists of retrieved articles and relevant websites were searched for randomized controlled trials published in the English language involving adults with chronic pain. Studies were included if one of the intervention arms had received pharmacist-led medication review independently or as part of a multidisciplinary intervention. Risk of bias was assessed for all the included studies.

    RESULTS: The search strategy yielded 583 unique articles including 5 randomized controlled trials. Compared with control, meta-analysis showed that participants in the intervention group had: a 0.8-point reduction in pain intensity on a 0 to 10 numerical rating scale at 3 months [95% confidence interval (CI), -1.28 to -0.36] and a 0.7-point reduction (95% CI, -1.19 to -0.20) at 6 months; a 4.84 point (95% CI, -7.38 to -2.29) and -3.82 point (95% CI, -6.49 to -1.14) improvement in physical functioning on a 0- to 68-point function subscale of Western Ontario and McMaster Universities Osteoarthritis Index at 3 and 6 months, respectively; and a significant improvement in patient satisfaction equivalent to a "small to moderate effect."

    DISCUSSION: Pharmacist-led medication review reduces pain intensity and improves physical functioning and patient satisfaction. However, the clinical significance of these findings remain uncertain due to small effect size and nature of reported data within clinical trials that limits recommendation of wider clinical role of pharmacist in chronic pain management.

  3. Rohin MA, Rozano N, Abd Hadi N, Mat Nor MN, Abdullah S, Dandinasivara Venkateshaiah M
    ScientificWorldJournal, 2013;2013:308041.
    PMID: 24311975 DOI: 10.1155/2013/308041
    This study was done to observe the anthropometry and body composition changes before, during, and after the holy month of Ramadan. This study was carried out on 46 staff from one of the local universities, which comprised of 14 males and 32 females ranging in age from 25 to 40 years old. There were four sessions done to complete this study, namely, a week before Ramadan (T1), 1st week of Ramadan (T2), 3rd week of Ramadan (T3), and a month after Ramadan (T4). All subjects were assessed according to weight, body circumference, and body composition status. It was found that subjects with different weight status showed a significant reduction in weight (P < 0.01) but no significant reduction in body fat percentage (P < 0.05). The findings suggest that weight reduction does not promise a reduction in body fat. Changes in neck circumference were only found in normal subjects. Hence, it can be said that overweight and obese subjects showed no changes in anthropometry status during Ramadan. No changes in body composition were reported in all three weight groups except for trunk body fat. In conclusion, normal subjects showed significant changes in various anthropometry parameters, but overweight and obese subjects showed no obvious difference.
  4. Cheah SC, Lai SL, Lee ST, Hadi AH, Mustafa MR
    Molecules, 2013 Jul 24;18(8):8764-78.
    PMID: 23887718 DOI: 10.3390/molecules18088764
    In the present study, we investigated the effects of panduratin A (PA), isolated from Boesenbergia rotunda, on apoptosis and chemoinvasion in A549 human non-small cell lung cancer cells. Activation of the executioner procaspase-3 by PA was found to be dose-dependent. Caspase-3 activity was significantly elevated at the 5 µg/mL level of PA treatment and progressed to a maximal level. However, no significant elevated level was detected on procaspase-8. These findings suggest that PA activated caspase-3 but not caspase-8. Numerous nuclei of PA treated A549 cells stained brightly by anti-cleaved PARP antibody through High Content Screening. This result further confirmed that PA induced apoptotic cell death was mediated through activation of caspase-3 and eventually led to PARP cleavage. Treatment of A549 cells with PA resulted in a strong inhibition of NF-κB activation, which was consistent with a decrease in nuclear levels of NF-κB/p65 and NF-κB/p50 and the elevation of p53 and p21. Besides that, we also showed that PA significantly inhibited the invasion of A549 cells in a dose-dependent manner through reducing the secretion of MMP-2 of A549 cells gelatin zymography assay. Our findings not only provide the effects of PA, but may also be important in the design of therapeutic protocols that involve targeting of either p53 or NF-κB.
  5. Yusuf A, Ab Hadi IS, Mahamood Z, Ahmad Z, Keng SL
    Asian Pac J Cancer Prev, 2013;14(6):3689-98.
    PMID: 23886167
    Breast cancer is the most common and leading cause of cancer mortality among Malaysian women. Despite good survival rates, the diagnosis of cancer still invokes the feeling of stress, fear and uncertainty. Because very little is known about the experiences of Malaysian women with breast cancer, a qualitative study using semi- structured interviews to explore the lived experience of newly diagnosed breast cancer. Using a purposive sampling method, 20 Malaysian women newly diagnosed with breast cancer, including Malays (n=10) and Chinese (n=10) were recruited in two main public hospitals in Kelantan. Similarities and divergence in women's experience were identified through thematic analysis of interview transcripts. Three themes emerged from the data: uncertainty experience of the illness, transition process and fatalistic view of breast cancer. In many ways, these findings were parallel with previous studies, suggesting that the experience of breast cancer is to a certain extent similar among women newly diagnosed with breast cancer. This study adds to the sparse literature concerning the experience of illness following breast cancer diagnosis among the Malays and Chinese. More importantly, this study addressed areas that were previously lacking, specifically in depth information on breast cancer experience from a developing country with a multi-ethnic population. The results of this investigation provide preliminary information to healthcare professionals on the impact of illness and cultural influence on survivorship to plan for appropriate education and supportive programme in order to meet the needs of breast cancer women more effectively.
  6. Golbabapour S, Hajrezaie M, Hassandarvish P, Abdul Majid N, Hadi AH, Nordin N, et al.
    Biomed Res Int, 2013;2013:974185.
    PMID: 23781513 DOI: 10.1155/2013/974185
    The investigation was to evaluate gastroprotective effects of ethanolic extract of M. pruriens leaves on ethanol-induced gastric mucosal injuries in rats. Forty-eight rats were divided into 8 groups: negative control, extract control, ulcer control, reference control, and four experimental groups. As a pretreatment, the negative control and the ulcer control groups were orally administered carboxymethylcellulose (CMC). The reference control was administered omeprazole orally (20 mg/kg). The ethanolic extract of M. pruriens leaves was given orally to the extract control group (500 mg/kg) and the experimental groups (62.5, 125, 250, and 500 mg/kg). After 1 h, CMC was given orally to the negative and the extract control groups. The other groups received absolute ethanol. The rats were sacrificed after 1 h. The ulcer control group exhibited significant mucosal injuries with decreased gastric wall mucus and severe damage to the gastric mucosa. The extract caused upregulation of Hsp70 protein, downregulation of Bax protein, and intense periodic acid schiff uptake of glandular portion of stomach. Gastric mucosal homogenate showed significant antioxidant properties with increase in synthesis of PGE2, while MDA was significantly decreased. The ethanolic extract of M. pruriens leaves was nontoxic (<5 g/kg) and could enhance defensive mechanisms against hemorrhagic mucosal lesions.
  7. Golbabapour S, Majid NA, Hassandarvish P, Hajrezaie M, Abdulla MA, Hadi AH
    OMICS, 2013 Jun;17(6):283-96.
    PMID: 23692361 DOI: 10.1089/omi.2012.0105
    DNA methylation, histone modifications, and chromatin configuration are crucially important in the regulation of gene expression. Among these epigenetic mechanisms, silencing the expression of certain genes depending on developmental stage and tissue specificity is a key repressive system in genome programming. Polycomb (Pc) proteins play roles in gene silencing through different mechanisms. These proteins act in complexes and govern the histone methylation profiles of a large number of genes that regulate various cellular pathways. This review focuses on two main Pc complexes, Pc repressive complexes 1 and 2, and their phylogenetic relationship, structures, and function. The dynamic roles of these complexes in silencing will be discussed herein, with a focus on the recruitment of Pc complexes to target genes and the key factors involved in their recruitment.
  8. Ansary RH, Rahman MM, Awang MB, Katas H, Hadi H, Doolaanea AA
    Drug Deliv Transl Res, 2016 06;6(3):308-18.
    PMID: 26817478 DOI: 10.1007/s13346-016-0278-y
    The purpose of this study was to fabricate insulin-loaded double-walled and single-polymer poly(lactide-co-glycolide) (PLGA) microspheres using a fast degrading glucose core, hydroxyl-terminated poly(lactide-co-glycolide) (Glu-PLGA), and a moderate degrading carboxyl-terminated PLGA polymers. A modified water-in-oil-in-oil-in-water (w/o/o/w) emulsion solvent evaporation technique was employed to prepare double-walled microspheres, whereas single-polymer microspheres were fabricated by a conventional water-in-oil-in-water (w/o/w) emulsion solvent evaporation method. The effect of fabrication techniques and polymer characteristics on microspheres size, morphology, encapsulation efficiency, in vitro release, and insulin stability was evaluated. The prepared double-walled microspheres were essentially non-porous, smooth surfaced, and spherical in shape, whereas single-polymer microspheres were highly porous. Double-walled microspheres exhibited a significantly reduced initial burst followed by sustained and almost complete release of insulin compared to single-polymer microspheres. Initial burst release was further suppressed from double-walled microspheres when the mass ratio of the component polymers was increased. In conclusion, double-walled microspheres made of Glu-PLGA and PLGA can be a potential delivery system of therapeutic insulin.
  9. Pati S, Muthuraju S, Hadi RA, Huat TJ, Singh S, Maletic-Savatic M, et al.
    Curr Stem Cell Res Ther, 2016;11(2):149-57.
    PMID: 26763886
    Traumatic brain injury (TBI) imposes horrendous neurophysiological alterations leading to most devastating forms of neuro-disability. Which includes impaired cognition, distorted locomotors activity and psychosomatic disability in both youths and adults. Emerging evidence from recent studies has identified mesenchymal stem cells (MSCs) as one of the promising category of stem cells having excellent neuroregenerative capability in TBI victims. Some of the clinical and animal studies reported that MSCs transplantation could cure neuronal damage as well as improve cognitive and locomotors behaviors in TBI. However, mechanism behind their broad spectrum neuroregenerative potential in TBI has not been reviewed yet. Therefore, in the present article, we present a comprehensive data on the important attributes of MSCs, such as neurotransdifferentiation, neuroprotection, axonal repair and plasticity, maintenance of blood-brain integrity, reduction of reactive oxygen species (ROS) and immunomodulation. We have reviewed in detail the crucial neurogenic capabilities of MSCs in vivo and provided consolidated knowledge regarding their cellular remodeling in TBI for future therapeutic implications.
  10. Pramual P, Thaijarern J, Sofian-Azirun M, Ya'cob Z, Hadi UK, Takaoka H
    J Med Entomol, 2015 Sep;52(5):829-36.
    PMID: 26336220 DOI: 10.1093/jme/tjv080
    Simulium feuerborni Edwards is geographically widespread in Southeast Asia. Previous cytogenetic study in Thailand revealed that this species is a species complex composed of two cytoforms (A and B). In this study, we cytologically examined specimens obtained from the Cameron Highlands, Malaysia, and Puncak, Java, Indonesia. The results revealed two additional cytoforms (C and D) of S. feuerborni. Specimens from Malaysia represent cytoform C, differentiated from other cytoforms by a fixed chromosome inversion on the long arm of chromosome III (IIIL-5). High frequencies of the B chromosome (33-83%) were also observed in this cytoform. Specimens from Indonesia represent the cytoform D. This cytoform is differentiated from others by a fixed chromosome inversion difference on the long arm of chromosome II (IIL-4). Mitochondrial DNA sequences support genetic differentiation among cytoforms A, B, and C. The pairwise F(ST) values among these cytoforms were highly significantly consistent with the divergent lineages of the cytoforms in a median-joining haplotype network. However, a lack of the sympatric populations prevented us from testing the species status of the cytoforms.
  11. Yun WZ, Kassab YW, Yao LM, Khairuddin N, Ming LC, Hadi MA
    Int J Clin Pharm, 2022 Oct;44(5):1140-1148.
    PMID: 35915341 DOI: 10.1007/s11096-022-01437-0
    BACKGROUND: Early administration of intravenous (IV) caffeine (initiation within 2 days of life) is an effective treatment strategy for the management of apnoea of prematurity among infants. However, the safety and effectiveness of early administration of oral caffeine treatment is not be fully established.

    AIM: We aimed to compare the effectiveness and safety of early versus late caffeine therapy on preterm infants' clinical outcomes.

    METHOD: A retrospective matched cohort study was conducted using data of patients admitted to neonatal intensive care units of two tertiary care hospitals between January 2016 and December 2018. The clinical outcomes and mortality risk between early caffeine (initiation within 2 days of life) and late caffeine (initiation ≥ 3 days of life) were compared.

    RESULTS: Ninety-five pairs matched based on gestational age were included in the study. Compared to late initiation, preterm infants with early caffeine therapy had: a shorter duration of non-invasive mechanical ventilation (median 5 days vs. 12 days; p 

  12. Khalid KA, Nawi AFM, Zulkifli N, Barkat MA, Hadi H
    Life (Basel), 2022 Dec 19;12(12).
    PMID: 36556508 DOI: 10.3390/life12122142
    Aging is a universal process that can cause diminished function of organs and various diseases. The most striking consequences of aging can be seen visibly on the skin, which acts as a barrier against various external insults. Aging of the skin consists of intrinsic and extrinsic processes that work in concert and influence each other. Intrinsic aging involves biochemical degenerative processes that gradually takes place with age. Extrinsic aging are biochemical processes driven by external influences that lead to aging. There are significant morphological changes at all levels in aged skin that have a profound effect on the characteristics of the skin. Even though skin is subjected to damage by external insults, it is equipped with a healing capability in order to restore its normal structure and function. However, aging has a significant impact on the skin's healing function by prolonging the inflammatory phase and increasing the production of reactive oxygen species (ROS). This shifts the healing process towards having more protein degradation, which can lead to chronic wound healing with an abundance of complications.
  13. Abdul Hadi A, Roslan SR, Mohammad Aidid E, Abdullah N, Musa R
    Int J Environ Res Public Health, 2022 Dec 16;19(24).
    PMID: 36554796 DOI: 10.3390/ijerph192416916
    BACKGROUND: Excessive screen time in young children is associated with many harmful consequences including screen dependency. Research has shown a worrying prevalence of media-related dependency among adolescents and pre-school children. There are a few available questionnaires among adolescents but none for pre-school children. This study aimed to design and validate a questionnaire to assess screen dependency among pre-school children aged 4 to 6 years old.

    METHODOLOGY: A cross-sectional two-phase study was carried out to develop the scale. In phase 1, a preliminary parent-report measure questionnaire was developed in Bahasa Malaysia. Later, it was sent to four experts for content validity followed by face validity. In Phase 2, a total of 386 parents of pre-school children aged 4 to 6 years old, split into two samples, were involved in the field study for exploratory factor analysis (EFA) and confirmatory factor analysis (CFA).

    RESULT: Sample 1 was used to perform EFA to determine the factorial structure of the SDS. All items with a factor loading of >0.4 were included. Sample 2 was used to perform the CFA. RMSEA and CFI analysis showed that the SDS has a good fit and confirms the dimensional structure found via EFA. The final questionnaire consists of 15 items with a 4 factors' structure and has excellent internal consistency reliability.

    CONCLUSIONS: The Screen Dependency Scale (SDS) is a reliable and valid questionnaire to detect screen dependency among pre-school children aged 4 to 6 years old in Malaysia.

  14. Yusuf A, P Iskandar YH, Ab Hadi IS, Nasution A, Lean Keng S
    Front Public Health, 2022;10:951641.
    PMID: 36324460 DOI: 10.3389/fpubh.2022.951641
    BACKGROUND: Lack of knowledge, poor awareness, and attitude are barriers to breast cancer (BC) screening participation. The ubiquitous usage of mobile phones makes it a perfect platform for delivering interventions to increase knowledge and awareness in screening, a strategy for early identification of BC. However, although numerous applications for BC prevention are available on major mobile phone platforms, relatively few have been tested in scientific studies to determine their efficacy.

    OBJECTIVE: This study aimed to assess the efficacy of BrAware Apps in increasing the knowledge of BC risk factors, awareness of warning signs and confidence in breast self-examination (BSE) among women in northeast peninsular Malaysia.

    METHODS: A quasi-experimental pre and post-test research design were conducted with 41 women participants in Kelantan, Malaysia, before and after using the BrAware apps. Participants were given an online, adapted Breast Cancer Awareness Measure questionnaire. Post-test was 2 months after using the BrAware apps. Comparison using paired T-tests were conducted to evaluate the change in knowledge of risk factors, warning signs awareness and confidence level for BSE.

    RESULTS: The mean age of women was 39.71(SD = 8.80). The participants' mean knowledge score of BC warning signs differs before using BrAware (mean 70.62, SD 11.74) and after using the BrAware app (mean 79.83, SD 10.15) at the <0.001 level of significance.

    CONCLUSIONS: The BrAware mobile app had a positive effect in increasing the women's knowledge of risk factors of BC, warning signs awareness and confidence level for BSE. It can be concluded that the mobile app may be an adjunct in educating women on BC.

  15. Mohamad Yazid MN, Nik Husain NR, Daud A, Osman Y, Mustapa N, Abdul Hadi A
    Cureus, 2023 Jan;15(1):e34046.
    PMID: 36824545 DOI: 10.7759/cureus.34046
    Introduction Healthcare workers have been suffering from workplace violence in alarming numbers, showing the importance of its prevention initiative. This study aims to develop and validate a new questionnaire to assess the perception and practice scores of workplace violence prevention among employers at healthcare facilities. Methods Existing literature has been reviewed to establish the domains and refine the items. The first drafted domain was the perception constructed by six components and 59 items. The second drafted domain was practice, consisting of six components and 41 items. Content validation was measured by a panel of experts using the item-level content validity index (I-CVI). Then, face validation analysis was carried out among 10 healthcare employers and presented as the item-level face validity index (I-FVI). Lastly, 222 participants were recruited to determine the validity and reliability of the questionnaire by using an exploratory factor analysis (EFA) and internal consistency reliability. Results Following content validation, two items in the practice domain were removed because of the I-CVI below 0.78. The I-CVI values of the remaining items for both domains were above 0.78, indicating good relevancy of 59 items to assess the perception and 39 items to evaluate the practice domains. The I-FVI values for both domains were above 0.80, suggesting that the participants easily understood the questionnaire. Bartlett's test of sphericity was significant for both domains (p<0.001). The Kaiser-Meyer-Olkin measure was 0.879 for the perception domain and 0.941 for the practice domain. All items load above 0.6 in their respective factor. In addition, Cronbach's alpha coefficient of reliability test ranged from 0.71 to 0.92 and from 0.82 to 0.97 for the perception and practice domains, respectively. The final revised questionnaire consisted of nine components (35 items) for perception and four components (27 items) for practice. Conclusion The newly developed set of questionnaires is a valid and reliable tool to assess the perception and practice of workplace violence prevention among employers at healthcare facilities.
  16. Hadi SH, Shaba TG, Madhi ZS, Darus M, Lupaş AA, Tchier F
    MethodsX, 2024 Dec;13:102842.
    PMID: 39071992 DOI: 10.1016/j.mex.2024.102842
    The study of holomorphic functions has been recently extended through the application of diverse techniques, among which quantum calculus stands out due to its wide-ranging applications across various scientific disciplines. In this context, we introduce a novel q-differential operator defined via the generalized binomial series, which leads to the derivation of new classes of quantum-convex (q-convex) functions. Several specific instances within these classes were explored in detail. Consequently, the boundary values of the Hankel determinants associated with these functions were analyzed. All graphical representations and computational analyses were performed using Mathematica 12.0.•These classes are defined by utilizing a new q-differential operator.•The coefficient values | a i | ( i = 2 , 3 , 4 ) are investigated.•Toeplitz determinants, such as the second T 2 ( 2 ) and the third T 3 ( 1 ) order inequalities, are calculated.
  17. Zafar R, Rehman IU, Shah Y, Ming LC, Hadi MA, Suleiman AK, et al.
    Medicine (Baltimore), 2024 Dec 20;103(51):e41004.
    PMID: 39705490 DOI: 10.1097/MD.0000000000041004
    Pharmacists, as an integral part of the healthcare team, can play a crucial role in preventing drug-related problems in patients with chronic kidney disease that arise due to inappropriate doses. This study aimed to develop and validate a new tool, the renal dosing questionnaire (RDQ-13), for pharmacists working across hospital, community, and retail pharmacy settings. A cross-sectional study was conducted from January to March 2023 among pharmacists working in different settings. The RDQ-13 scale consists of 3-sections, encompassing demographic details, a knowledge section with 6 domains, each having 4 questions with the choice of "yes/no," an attitude section featuring a Likert scale for 4 items, and a perception section featuring a Likert scale for 3 items. The assessment of construct and discriminative validity was performed along with testing for reliability. The average variance extracted value and the composite reliability value were used for convergent validity. A total of 65 pharmacists completed the RDQ-13, but at retest n = 2 participants were dropped (response rate at retest was 96.9%). Exploratory factor analysis revealed 3-factor loadings with 59.1% of the variance, whereas the Kaiser-Mayer-Olkin value was 0.60. The Cronbach alpha value of 0.700 indicates good internal consistency, whereas the intraclass correlation coefficient (ICC) for the test and retest showed that most domains/scores were statistically significant (P 
  18. Hadi N, Nakhaeitazreji S, Kakian F, Hashemizadeh Z, Ebrahiminezhad A, Chong JWR, et al.
    Mol Biotechnol, 2024 Dec;66(12):3573-3582.
    PMID: 37957480 DOI: 10.1007/s12033-023-00957-y
    The synergistic effects of antimicrobial nanostructures with antibiotics present a promising solution for overcoming resistance in methicillin-resistant Staphylococcus aureus (MRSA). Previous studies have introduced iron as a novel coating for silver nanoparticles (AgNPs) to enhance both economic efficiency and potency against S. aureus. However, there are currently no available data on the potential of these novel nanostructures to reverse MRSA resistance. To address this gap, a population study was conducted within the MRSA community, collecting a total of 48 S. aureus isolates from skin lesions. Among these, 21 isolates (43.75%) exhibited cefoxitin resistance as determined by agar disk diffusion assay. Subsequently, a PCR test confirmed the presence of the mecA gene in 20 isolates, verifying them as MRSA. These results highlight the cefoxitin disk diffusion susceptibility test as an accurate screening method for predicting mecA-mediated resistance in MRSA. Synergy tests were performed on cefoxitin, serving as a marker antibiotic, and iron-coated AgNPs (Fe@AgNPs) in a combination study using the checkerboard assay. The average minimal inhibitory concentration (MIC) and fractional inhibitory concentration (FIC) of cefoxitin were calculated as 11.55 mg/mL and 3.61 mg/mL, respectively. The findings indicated a synergistic effect (FIC index 
  19. Chu PH, Jenol MA, Phang LY, Ibrahim MF, Purkan P, Hadi S, et al.
    Environ Sci Pollut Res Int, 2024 May;31(23):33303-33324.
    PMID: 38710845 DOI: 10.1007/s11356-024-33534-0
    Agricultural plantations in Indonesia and Malaysia yield substantial waste, necessitating proper disposal to address environmental concerns. Yet, these wastes, rich in starch and lignocellulosic content, offer an opportunity for value-added product development, particularly amino acid production. Traditional methods often rely on costly commercial enzymes to convert biomass into fermentable sugars for amino acid production. An alternative, consolidated bioprocessing, enables the direct conversion of agricultural biomass into amino acids using selected microorganisms. This review provides a comprehensive assessment of the potential of agricultural biomass in Indonesia and Malaysia for amino acid production through consolidated bioprocessing. It explores suitable microorganisms and presents a case study on using Bacillus subtilis ATCC 6051 to produce 9.56 mg/mL of amino acids directly from pineapple plant stems. These findings contribute to the advancement of sustainable amino acid production methods using agricultural biomass especially in Indonesia and Malaysia through consolidated bioprocessing, reducing waste and enhancing environmental sustainability.
  20. Abbas SS, Hassan BAR, Hadi HA, Mohammed AH, Alsammarraie AZA, Al-Bayati MA
    Sci Prog, 2026;109(4):368504261504506.
    PMID: 42969552 DOI: 10.1177/00368504261504506
    ObjectiveThe primary objective of this experimental formulation-development study was to prepare and physicochemically characterize a trastuzumab-loaded liposomal formulation containing post-inserted DSPE-PEG2000 for systemic-delivery research. The secondary objective was to determine whether the preparation and recovery process preserved trastuzumab monomeric integrity and HER2-binding activity.MethodsLiposomes were prepared by thin-film hydration, pulsed probe sonication, sequential membrane extrusion, post-insertion of DSPE-PEG2000, and dialysis purification. The 65:30:5 phosphatidylcholine:cholesterol:DSPE-PEG2000 molar composition was selected using literature-guided operational criteria; no formal Design of Experiments model was used. Particle size, PDI, zeta potential, dialysis-based apparent encapsulation efficiency, morphology, physicochemical properties, antibody integrity, HER2-binding activity, and 28-day storage stability were evaluated using DLS, microscopy, FTIR, DSC, TGA, XRD, SEC-HPLC, and HER2-binding ELISA.ResultsThe selected formulation had a mean particle size of 149.3 ± 5.8 nm, PDI of 0.22 ± 0.02, apparent zeta potential of +39.1 ± 2.1 mV under low-conductivity measurement conditions, and dialysis-based apparent encapsulation efficiency of 73.6 ± 3.7%. Recovered trastuzumab remained predominantly monomeric (94.9 ± 1.4%) and largely retained HER2-binding activity (92 ± 6%). Refrigerated samples showed the smallest 28-day changes, whereas 37 °C storage increased particle size and PDI and reduced apparent encapsulation efficiency.ConclusionsThe selected formulation met the predefined physicochemical and protein-quality endpoints and largely preserved trastuzumab integrity and HER2-binding activity. Refrigeration provided the greatest short-term stability. The findings establish an integrated characterization benchmark under the tested conditions but do not demonstrate quantified surface PEG density, physiological zeta-potential behavior, hemocompatibility, prolonged circulation, biodistribution, or therapeutic efficacy.
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