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Fulltext Effects of temperature on the photosynthetic parameters of antarctic benthic microalgal community

Salleh, S., McMinn, A., Mohammad, M., Yasin, Z., Tan, S.H.A.

ASM Science Journal, 2010;4(1):81-88.
MyJurnal

Elevated temperature affects marine benthic algae by reducing growth and limits the transport of electron or carbon fixation which may reduce the ability of the cell to use light. This resulting excess light energy may cause photoinhibition. In this study, the photosystem II of the benthic microalgal communities from Casey, eastern Antarctic were relatively unaffected by significant changes in temperatures up to 8ºC, along with high PAR level (450 μmol photons m–2 s–1). Similarly, the community was able to photosynthesize as the temperature was reduced to –5ºC. Recovery from saturating and photoinhibiting irradiances was not significantly influenced by temperatures at both –5ºC and 8ºC. These responses were consistent with those recorded by past experiments on Antarctic benthic diatoms and temperate diatoms which showed that climate change did not have a significant impact on the ability of benthic microalgae to recover from photoinhibitory temperature stress.
Fulltext Pulmonary function in symptom-free asthmatics

Yaacob I, Mohammad M

Singapore Med J, 1993 Dec;34(6):522-3.
PMID: 8153715

Seventy-five adult asthmatic patients with clinical remission underwent spirometry. Only 8.3% of the subjects demonstrated normal spirometry. The others had reduced vital capacity (VC), forced vital capacity (FVC), forced expiratory volume in one second (FEV1), maximum mid-expiratory flow rate (MMF) and peak flow rate (PEFR). This study demonstrates that asthma can cause irreversible airflow obstruction and there is a poor relationship between symptoms in asthmatics and their respiratory function test results.
Study site: Chest clinic, Hospital Universiti Sains Malaysia (HUSM), Kelantan, Malaysia
Failure analysis of stainless steel femur fixation plate

Hussain PB, Mohammad M

Med J Malaysia, 2004 May;59 Suppl B:180-1.
PMID: 15468877

Failure analysis was performed to investigate the failure of the femur fixation plate which was previously fixed on the femur of a girl. Radiography, metallography, fractography and mechanical testing were conducted in this study. The results show that the failure was due to the formation of notches on the femur plate. These notches act as stress raisers from where the cracks start to propagate. Finally fracture occurred on the femur plate and subsequently, the plate failed.
Variants and pitfalls in MR imaging of knee injuries

Tan HK, Bakri MM, Peh WC

Semin Musculoskelet Radiol, 2014 Feb;18(1):45-53.
PMID: 24515881 DOI: 10.1055/s-0034-1365834

MR imaging is an established tool for the detection and diagnosis of various injuries and internal derangements of the knee, enabling excellent anatomical visualization and producing good soft tissue contrast and characterization. However, numerous normal variants and potential pitfalls may lead to diagnostic errors. Understanding the basic MR imaging principles, applying the correct technique, knowing the normal anatomy and variants, recognizing artifacts, and assuring good clinical and radiographic correlation helps avoid these potential pitfalls.
Prevalence and subtype distribution of Blastocystis sp. in cattle from Pahang, Malaysia

Kamaruddin SK, Mat Yusof A, Mohammad M

Trop Biomed, 2020 Mar 01;37(1):127-141.
PMID: 33612724

Blastocystis sp. is a common enteric protozoan parasite found in humans and various type of animal worldwide. Recently, genotypic distribution of Blastocystis sp. was revealed in insects, rodents, avian and mammals, which exposed its potential of transmiting the infections to human. However, very little information on current level of Blastocystis sp. infection were reported in cattle from Malaysia. Herein, a total of 120 stool samples of cattles were collected. While the potential risk of infection such as age, gender, body score, diarrheic condition of the cattle were noted, the management of the farms was also recorded. All stool sample were cultured, but 80 samples were selected for PCR sequencing analysis. The cultivation and microscopic examination revealed only 25% of the cattle (30/120) were infected with Blastocystis sp.. But, 43.8% of the cattle (35/80) were found positive upon PCR sequencing. The study also found that age, body score condition, diarrheic condition and certain farm were associated with the infection (p<0.05). Six subtypes (STs) that were discovered during the study were ST10 (21.3%;17/35), ST5 (8.8%;7/35), ST3 (7.5%;6/35), ST1 (2.5%;2/35), ST4 (2.5%;2/35) and ST14 (1.3%;1/35). Thus, moderate infections of Blastocystis sp. and variants in the genotypic distributions of the cattle suggest its potential for zoonotic transmission. Therefore, this findings could be helpful for further understanding the parasite, which assist studies of its pathogenicity.
Effectiveness of a brief physician counselling session on improving smoking behaviour in the workplace

Han YW, Mohammad M, Liew SM

Asian Pac J Cancer Prev, 2014;15(17):7287-90.
PMID: 25227830

BACKGROUND: Brief physician counselling has been shown to be effective in improving smokers' behaviour. If the counselling sessions can be given at the workplace, this would benefit a larger number of smokers. This study aimed to determine the effectiveness of a ten-minute physician counseling session at the workplace in improving smoking behaviour.
MATERIALS AND METHODS: This prospective randomised control trial was conducted on smokers in a factory. A total of 163 participants were recruited and randomised into control and intervention groups using a table of random numbers. The intervention group received a ten-minute brief physician counselling session to quit smoking. Stages of smoking behaviour were measured in both groups using a translated and validated questionnaire at baseline, one month and three months post intervention.
RESULTS: There was a significant improvement in smoking behaviour at one-month post intervention (p=0.024, intention to treat analysis; OR=2.525; CI=1.109-5.747). This was not significant at three-month post intervention (p=0.946, intention to treat analysis; OR=1.026; 95% CI=0.486-2.168).
CONCLUSIONS: A session of brief physician counselling was effective in improving smokers' behaviour at workplace, but the effect was not sustained.
Fulltext Pattern of complementary and alternative medicine use among Malaysian stroke survivors: A hospital-based prospective study

Kadir AA, Hamid AH, Mohammad M

J Tradit Complement Med, 2015 Jul;5(3):157-60.
PMID: 26151028 DOI: 10.1016/j.jtcme.2014.11.010

Complementary and alternative medicine (CAM; bǔ chōng yǔ tì dài yī xué) is widely practiced among stroke patients globally. We conducted a study to determine the pattern of CAM use and its associated factors in stroke survivors attending a tertiary hospital in Malaysia within 6 months after the stroke. This was a prospective cohort study that included all stroke patients who were admitted to a tertiary center in Malaysia from December 2009 to December 2010. Patients were interviewed and examined within 72 hours of admission. The sociodemographic data and medical history were collected. Clinical examinations were done to assess the stroke severity using the Scandinavian Stroke Scale and functional status based on modified Barthel index (MBI). Patients were reassessed at 6 months after the stroke on the CAM use and functional status (MBI). The response rate was 92%. The study population consisted of 52 men and 41 women with a mean age of 63.7 ± 10.3 years. Sixty-seven percent practiced CAM. Massage was the most frequently used method (63.4%), followed by vitamins (7.5%). In multiple logistic regression analysis, functional status (MBI score) on discharge (p = 0.004, odds ratio 1.034, 95% confidence interval 1.01-1.06) and Scandinavian Stroke Scale score (p = 0.045, odds ratio 1.87, 95% confidence interval 1.01-3.43) were significant predictors for use of CAM. In conclusion, the use of CAM among stroke survivors is high. Patients who have better functional status on discharge and less severe stroke are more likely to use CAM.
Fulltext Carbon Derived from Jatropha Seed Hull as a Potential Green Adsorbent for Cadmium (II) Removal from Wastewater

Mohammad M, Yaakob Z, Abdullah SRS

Materials (Basel), 2013 Oct 09;6(10):4462-4478.
PMID: 28788340 DOI: 10.3390/ma6104462

Carbon from jatropha seed hull (JC) was prepared to study the adsorption of cadmium ions (Cd(2+)) from aqueous solutions under various experimental conditions. Batch equilibrium methods have been used to study the influences of the initial metal ion concentration (0.5-50 ppm), dosage (0.2-1 g), contact time (0-300 min), pH (2-7), and temperature (26-60 °C) on adsorption behavior. It has been found that the amount of cadmium adsorbed increases with the initial metal ion concentration, temperature, pH, contact time, and amount of adsorbent. A kinetic study proved that the mechanism of Cd(2+) adsorption on JC followed a three steps process, confirmed by an intraparticle diffusion model: rapid adsorption of metal ions, a transition phase, and nearly flat plateau section. The experimental results also showed that the Cd(2+) adsorption process followed pseudo-second-order kinetics. The Langmuir and Freundlich adsorption isotherm models were used to describe the experimental data, with the former exhibiting a better correlation coefficient than the latter (R² = 0.999). The monolayer adsorption capacity of JC has been compared with the capacities of the other reported agriculturally-based adsorbents. It has been clearly demonstrated that this agricultural waste generated by the biofuel industry can be considered a potential low-cost adsorbent for the removal of Cd(2+) from industrial effluents.
Fulltext Prevalence and awareness of halitosis in a sample of Jordanian population

Hammad MM, Darwazeh AM, Al-Waeli H, Tarakji B, Alhadithy TT

J Int Soc Prev Community Dent, 2014 Dec;4(Suppl 3):S178-86.
PMID: 25625076 DOI: 10.4103/2231-0762.149033

This study was conducted to estimate the prevalence and awareness of halitosis among the subjects of a population, and also to compare the results of Halimeter(®) readings to self-estimation of halitosis and to assess the relationship between halitosis and oral health.
New pyrimidine-benzoxazole/benzimidazole hybrids: Synthesis, antioxidant, cytotoxic activity, in vitro cyclooxygenase and phospholipase A2-V inhibition

Abdelgawad MA, Bakr RB, Ahmad W, Al-Sanea MM, Elshemy HAH

Bioorg Chem, 2019 11;92:103218.
PMID: 31536956 DOI: 10.1016/j.bioorg.2019.103218

To enhance the cytotoxicity of benzimidazole and/or benzoxazole core, the benzimidazole/benzoxazole azo-pyrimidine were synthesized through diazo-coupling of 3-aminophenybenzimidazole (6a) or 3-aminophenylbenzoxazole (6b) with diethyl malonate. The new azo-molanates 6a&b mixed with urea in sodium ethoxide to afford the benzimidazolo/benzoxazolopyrimidine 7a&b. The structure elucidation of new synthesized targets was proved using spectroscopic techniques NMR, IR and elemental analysis. The cytoxicity screening had been carried out against five cancer cell lines: prostate cancer (PC-3), lung cancer (A-549), breast cancer (MCF-7), pancreas cancer (PaCa-2) and colon cancer (HT-29). Furthermore, the antioxidant activity, phospholipase A2-V and cyclooxygenases inhibitory activities of the target compounds 7a&b were evaluated and the new compounds showed potent activity (cytotoxicity IC50 range from 4.3 to 9.2 µm, antioxidant activity from 40% to 80%, COXs or LOX inhibitory activity from 1.92 µM to 8.21 µM). The docking of 7a&b was made to confirm the mechanism of action.
Novel docetaxel chitosan-coated PLGA/PCL nanoparticles with magnified cytotoxicity and bioavailability

Badran MM, Alomrani AH, Harisa GI, Ashour AE, Kumar A, Yassin AE

Biomed Pharmacother, 2018 Oct;106:1461-1468.
PMID: 30119220 DOI: 10.1016/j.biopha.2018.07.102

In the present study, docetaxel (DTX)-loaded poly(lactic-co-glycolic acid) (PLGA) and polycaprolactone (PCL) nanoparticles were successfully prepared and coated with chitosan (CS). The prepared nanoparticles (NPs) were evaluated for their particle size, zeta potential, particle morphology, drug entrapment efficiency (EE%), and in vitro drug release profile. The anticancer activity of DTX-loaded NPs was assessed in human HT29 colon cancer cell line utilizing MTT assay. The pharmacokinetics of DTX-loaded NPs was monitored in Wistar rats in comparison to DTX solution. The prepared NPs exhibited particle sizes in the range 177.1 ± 8.2-287.6 ± 14.3 nm. CS decorated NPs exhibited a significant increase in particle size and a switch of zeta potential from negative to positive. In addition, high EE% values were obtained for CS coated PCL NPs and PLGA NPs as 67.1 and 76.2%, respectively. Moreover, lowering the rate of DTX in vitro release was achieved within 48 h by using CS coated NPs. Furthermore, a tremendous increase in DTX cytotoxicity was observed by CS-decorated PLGA NPs compared to all other NPs including DTX-free-NPs and pure DTX. The in vivo study revealed significant enhancement in DTX bioavailability from CS-decorated PLGA NPs with more than 4-fold increase in AUC compared to DTX solution. In conclusion, CS-decorated PLGA NPs are a considerable DTX-delivery carrier with magnificent antitumor efficacy.
Fulltext The Synthesis, Characterization, Cytotoxic Activity Assessment and Structure-Activity Relationship of 4-Aryl-6-(2,5-dichlorothiophen-3-yl)-2-methoxypyridine-3-carbonitriles

Al-Refai M, Ibrahim MM, Azmi MN, Osman H, Bakar MHA, Geyer A

Molecules, 2019 Nov 10;24(22).
PMID: 31717690 DOI: 10.3390/molecules24224072

A series of 2-methoxypyridine-3-carbonitrile (5a-i)-bearing aryl substituents were successfully synthesized in good yields by the condensation of chalcones (4a-i) with malononitrile in basic medium. The condensation process, in most cases, offers a route to a variety of methoxypyridine derivatives (6a-g) as side products in poor yields. All new compounds were fully characterized using different spectroscopic methods. Mass ESI-HMRS measurements were also performed. Furthermore, these compounds were screened for their in vitro cytotoxicity activities against three cancer cell lines; namely, those of the liver (line HepG2), prostate (line DU145) and breast (line MBA-MB-231). The cytotoxicity assessment revealed that compounds 5d, 5g, 5h and 5i exhibit promising antiproliferative effects (IC50 1-5 µM) against those three cancer cell lines.
Small Molecules as LIM Kinase Inhibitors

Bukhari SNA, Tandiary MA, Al-Sanea MM, Abdelgawad MA, Chee CF, Hussain MA

Curr Med Chem, 2021 Oct 26.
PMID: 34702151 DOI: 10.2174/0929867328666211026120335

LIMK1 and LIMK2 are involved in the regulation of cellular functions that depend on the dynamics of actin cytoskeleton. Disregulation of LIM kinases has been associated with diseases, such as tumor progression and metastasis, viral infection, and ocular diseases. Motivated by this, numerous studies have been carried out to discover small organic molecules capable of inhibiting LIM kinase effectively and selectively. In this review, a comprehensive survey of small organic molecules for LIM kinase inhibitors is reported, together with SAR study results, and the synthesis of these inhibitors.
Fulltext NFIX as a Master Regulator for Lung Cancer Progression

Rahman NIA, Abdul Murad NA, Mollah MM, Jamal R, Harun R

Front Pharmacol, 2017;8:540.
PMID: 28871224 DOI: 10.3389/fphar.2017.00540

About 40% of lung cancer cases globally are diagnosed at the advanced stage. Lung cancer has a high mortality and overall survival in stage I disease is only 70%. This study was aimed at finding a candidate of transcription regulator that initiates the mechanism for metastasis by integrating computational and functional studies. The genes involved in lung cancer were retrieved using in silico software. 10 kb promoter sequences upstream were scanned for the master regulator. Transient transfection of shRNA NFIXs were conducted against A549 and NCI-H1299 cell lines. qRT-PCR and functional assays for cell proliferation, migration and invasion were carried out to validate the involvement of NFIX in metastasis. Genome-wide gene expression microarray using a HumanHT-12v4.0 Expression BeadChip Kit was performed to identify differentially expressed genes and construct a new regulatory network. The in silico analysis identified NFIX as a master regulator and is strongly associated with 17 genes involved in the migration and invasion pathways including IL6ST, TIMP1 and ITGB1. Silencing of NFIX showed reduced expression of IL6ST, TIMP1 and ITGB1 as well as the cellular proliferation, migration and invasion processes. The data was integrated with the in silico analyses to find the differentially expressed genes. Microarray analysis showed that 18 genes were expressed differentially in both cell lines after statistical analyses integration between t-test, LIMMA and ANOVA with Benjamini-Hochberg adjustment at p-value < 0.05. A transcriptional regulatory network was created using all 18 genes, the existing regulated genes including the new genes PTCH1, NFAT5 and GGCX that were found highly associated with NFIX, the master regulator of metastasis. This study suggests that NFIX is a promising target for therapeutic intervention that is expected to inhibit metastatic recurrence and improve survival rate.
Fulltext Prospects of evolution-based artificial intelligence models in genome-wide studies to stratify genetic risk variants in nonalcoholic fatty liver disease

Huang H, Awuah WA, Garg T, Ng JC, Mehta A, Ramamoorthy K, et al.

Ann Med Surg (Lond), 2023 Jun;85(6):2743-2748.
PMID: 37363524 DOI: 10.1097/MS9.0000000000000743

The emergence of genome-wide association studies (GWAS) has identified genetic traits and polymorphisms that are associated with the progression of nonalcoholic fatty liver disease (NAFLD). Phospholipase domain-containing 3 and transmembrane 6 superfamily member 2 are genes commonly associated with NAFLD phenotypes. However, there are fewer studies and replicability in lesser-known genes such as LYPLAL1 and glucokinase regulator (GCKR). With the advent of artificial intelligence (AI) in clinical genetics, studies have utilized AI algorithms to identify phenotypes through electronic health records and utilize convolution neural networks to improve the accuracy of variant identification, predict the deleterious effects of variants, and conduct phenotype-to-genotype mapping. Natural language processing (NLP) and machine-learning (ML) algorithms are popular tools in GWAS studies and connect electronic health record phenotypes to genetic diagnoses using a combination of international classification disease (ICD)-based approaches. However, there are still limitations to machine-learning - and NLP-based models, such as the lack of replicability in larger cohorts and underpowered sample sizes, which prevent the accurate prediction of genetic variants that may increase the risk of NAFLD and its progression to advanced-stage liver fibrosis. This may be largely due to the lack of understanding of the clinical consequence in the majority of pathogenic variants. Though the concept of evolution-based AI models and evolutionary algorithms is relatively new, combining current international classification disease -based NLP models with phylogenetic and evolutionary data can improve prediction accuracy and create valuable connections between variants and their pathogenicity in NAFLD. Such developments can improve risk stratification within clinical genetics and research while overcoming limitations in GWAS studies that prevent community-wide interpretations.
Fulltext Fruit-Derived Polysaccharides and Terpenoids: Recent Update on the Gastroprotective Effects and Mechanisms

Khan MSA, Khundmiri SUK, Khundmiri SR, Al-Sanea MM, Mok PL

Front Pharmacol, 2018;9:569.
PMID: 29988459 DOI: 10.3389/fphar.2018.00569

Ulceration in the stomach develops in peptic ulcer disease when there is a loss of protective mucosal layers, particularly in Helicobacter pylori infection. Antibiotic therapy has failed to eradicate and impede the colonization of H. pylori. Despite given treatment, recurrent bleeding can occur and lead to death in the affected individual. The disease progression is also related to the non-steroidal inflammatory drug and stress. There are extensive research efforts to identify the gastroprotective property from various alkaloids, flavonoids, and tannins compounds from plants and marine. These natural products are believed to be safe for consumption. However, not much attention was given to summarize the carbohydrate and terpenoidal anti-ulcer compounds. Hence, this review will cover the possible mechanisms and information about acidic hydroxylans, arabinogalactan and rhamnogalacturon; and limonene, pinene, lupeol, citral, ursolic acid and nomilin to exemplify on the gastroprotective properties of polysaccharides and terpenoid, respectively, obtained from fruits. These compounds could act as a prebiotic to prevent the inhabitation of H. pylori, modulate the inflammation, suppress gastric cancer growth, and capable of stimulating the reparative mechanisms on the affected regions. Finally, this review provides the future research prospects of these natural compounds in an effort to develop new therapy for gastrointestinal tissue healing.
Fulltext Case series of syphilis and HIV co-infections

Abdul Wahab A, Rahman MM, Mohammad M, Hussin S

Pak J Med Sci, 2013 May;29(3):856-8.
PMID: 24353643

Syphilis and HIV co-infection are indeed dangerous combinations. The present communication describes three different cases of syphilis and HIV co-infection in young men. The first case is a 25-year-old medical graduate with a primary and secondary syphilis lesions at time of presentation. The second case is a 24-year-old government officer with right eye posterior uveitis where the serology tests for syphilis were reactive. His HIV tests were also positive. The final case is a 25-year-old homosexual who was admitted to the medical ward because of Mycobacterium tuberculosis infection. The HIV and syphilis serology tests were noted to be positive.
Fulltext Anti-cyclic citrullinated peptide antibody is a good indicator for the diagnosis of rheumatoid arthritis

Abdul Wahab A, Mohammad M, Rahman MM, Mohamed Said MS

Pak J Med Sci, 2013 May;29(3):773-7.
PMID: 24353626

Objectives: Anti-cyclic citrullinated peptide (CCP) antibody has recently been used in the classification
of rheumatoid arthritis (RA). This antibody is more specific than rheumatoid factor (RF) for the diagnosis of RA. The study objectives were to determine the sensitivity, specificity, positive and negative predictive values of anti-CCP in RA diagnosis.
Methodology: Eighty RA patients and 80 non-RA individuals were included in the study. Blood was collected from both arms of study subjects and tested for anti-CCP and RF antibodies. Relevant clinical information and laboratory profiles of the RA patients were evaluated using patients’ medical records and Integrated Laboratory Management System (ILMS), respectively.
Results: The sensitivity and specificity of anti-CCP were 35% and 100% respectively. The positive and
negative predictive values were 100% and 61%, respectively. Positive anti-CCP was found significantly
associated with multiple joint pain (p < 0.001) and hand’s joints pain (p=0.01), symmetrical joints
involvement (p=0.015) and high CRP value (p < 0.001). Anti-CCP was also found to have positive association with RF (p < 0.001).
Conclusion: Anti-CCP is highly specific for the diagnosis of RA. High positive predictive value should be taken into consideration for effective treatment.
KEY WORD: Rheumatoid arthritis, anti-CCP, Rheumatoid factor, Sensitivity, Specificity, Positive predictive value, Negative predictive value.
Study site: Rheumatology Unit, Pusat Perubatan Universiti Kebangsaan Malaysia (PPUKM), Kuala Lumpur, Malaysia
Fulltext Laboratory aspects of asymptomatic bacteriuria in pregnancy

Mohammad M, Mahdy ZA, Omar J, Maan N, Jamil MA

Southeast Asian J. Trop. Med. Public Health, 2002 Sep;33(3):575-80.
PMID: 12693594

A total of 1,661 pregnant women aged between 13 and 45 years were screened for bacteriuria by urine culture. Of the 1,661 culture results, 615 (37%) yielded no growth; 728 (43.8%) yielded no significant growth (presence of <10(5) organisms/ml urine of one or more types of bacteria); 286 (17.2%) yielded mixed growth (presence of >10(5) organisms/ml urine of more than one type of bacteria) and only 32 (1.9%) showed significant growth (presence of >10(5) organisms/ml urine of a single bacterium). Urine microscopy was also conducted. Two hundred and twenty-four (13.5%) specimens had >10 white blood cells/ml urine, of which 66 had >100 white blood cells; 13 were from the significant growth group. Three hundred and seventy-four (22.5%) specimens showed the presence of bacteria, 42 (2.5%) had red blood cells, 370 (22.3%) had epithelial cells, 58 (3.5%) had crystals, and 14 (0.8%) had yeasts. The most common bacterium isolated was Escherichia coli (12; 40%); the others included group B Streptococcus (5; 15%), Klebsiella spp (5; 15%), Diphtheroids (2), and Candida albicans (2). Fifty-two percent of tested strains were sensitive to ampicillin; 24 of 28 strains (85.7%) were sensitive to ciprofloxacin; all 7 strains tested were sensitive to nitrofurantoin and all 20 strains tested were sensitive to cotrimoxazole; 14/20 (70%) and 16/17 (94.1%) were sensitive to cephalexin and cefuroxime respectively. This study shows that asymptomatic bacteriuria does occur in pregnant women, albeit at a very low rate in an urban setting like Cheras. Urine microscopy is not specific and only serves as a guide to bacteriuria. The commonest causative organisms are those from the gastrointestinal tract and vagina. The antibiogram showed that cefuroxime and cephalexin are likely to be effective in treating bacteriuria: ampicillin must be reserved for Gram-negative organisms. For Gram-positive organisms, of which Group B Streptococcus is important, ampicillin is still effective in vitro. Nitrofurantion and cotrimoxazole have excellent activity in vitro and should be considered for therapy. 17.2% of the urine culture yielded mixed growth: likely to indicate that contamination of urine specimens still happens despite the strict instructions given to patients about the collection of a midstream urine specimen. Proper collection, appropriate transport, and the early processing of urine specimens remain essential.
Fulltext A Comprehensive Study on Starch Nanoparticle Potential as a Reinforcing Material in Bioplastic

Marta H, Wijaya C, Sukri N, Cahyana Y, Mohammad M

Polymers (Basel), 2022 Nov 12;14(22).
PMID: 36433002 DOI: 10.3390/polym14224875

Starch can be found in the stems, roots, fruits, and seeds of plants such as sweet potato, cassava, corn, potato, and many more. In addition to its original form, starch can be modified by reducing its size. Starch nanoparticles have a small size and large active surface area, making them suitable for use as fillers or as a reinforcing material in bioplastics. The aim of reinforcing material is to improve the characteristics of bioplastics. This literature study aims to provide in-depth information on the potential use of starch nanoparticles as a reinforcing material in bioplastic packaging. This study also reviews starch size reduction methods including acid hydrolysis, nanoprecipitation, milling, and others; characteristics of the nano-starch particle; and methods to produce bioplastic and its characteristics. The use of starch nanoparticles as a reinforcing material can increase tensile strength, reduce water vapor and oxygen permeability, and increase the biodegradability of bioplastics. However, the use of starch nanoparticles as a reinforcing material for bioplastic packaging still encounters obstacles in its commercialization efforts, due to high production costs and ineffectiveness.

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