MyMedR

Displaying publications 341 - 360 of 7255 in total

Abstract:

Sort:

Fulltext Phytochemical screening and antioxidant activity of unripe Cavendish and dream banana (Musa sp.) fruits peels

Nur Nadirah Rodzali, Saiyidah Nafisah Hashim, Muhammad Syamil Mohd Suib

Journal of Academia Universiti Teknologi MARA Negeri Sembilan, 2018;6(1):39-44.
MyJurnal

Banana fruit which belongs to the family Musaceae is one of the most widely distributed and
consumed fruit in the world especially in tropical and subtropical countries. People only consume the
banana’s pulp and dump its peel as solid waste. This gives a very serious agricultural waste disposal
and eventually cause environmental problems that keep worsen each day. Thus, this study concern
on the phytochemical content and the antioxidant in peel extracts of unripe Cavendish and Dream
banana. The dried peels of banana fruit were grinded and extracted by using ethanol as the extraction
solvent. The percentage yield of the ethanol extract of unripe Cavendish and Dream banana fruit
peels were 17.765 % and 17.081 % respectively. The banana peel extracts were screened for the
presence of bioactive compounds which showed the presence of phenols, flavonoids and tannins.
Antioxidant activity of the banana peel extracts was evaluated using 1,1-diphenyl-2-picrylhydrazyl
(DPPH) free radical scavenging assay. The concentration of the peel extracts required for 50 %
inhibition of DPPH radical scavenging activity ( ) were recorded at 90.28 μg/ml for Cavendish
and 113.09 μg/ml for Dream banana. The extracts of both banana peels definitely showed potential
as a sources of natural antioxidant.
A qualitative study investigating perceived barriers to medication adherence in chronic illness patients of Karachi, Pakistan

Naqvi AA, Hassali MA, Aftab MT, Nadir MN

J Pak Med Assoc, 2019 Feb;69(2):216-223.
PMID: 30804587

OBJECTIVE: The study aimed to perceived barriers to medication adherence in patients with chronic illnesses..
METHODS: A qualitative study was conducted in a tertiary care hospital in Karachi in September 2017, using grounded theory and inductive approach. Interviews were conducted using a checklist in Urdu language from patients of chronic illnesses determined based on medicines dispensed from the out-patient pharmacy in hospital. Interviews were recorded, transcribed verbatim, translated in English and validated. The translated quotations were analysed using a qualitative analysis software, and thematic analysis was conducted. Codes were generated and analysed by semantic linkages and network analysis using ATLAS.ti qualitative research software.
RESULTS: Of the 16 patients interviewed, 8(50%) were males and 8(50%) were females. Barriers to medication adherence identified were patient behaviour (intentional and un-intentional non-adherence), comorbidity and pill burden, cost-related non-adherence, and low patient knowledge. The last barrier was associated with the rest.
CONCLUSIONS: Counselling has the potential to increase patient knowledge regarding medication use, and active pharmacist-physician collaboration can improve medication adherence..
Social Profiling: A Review, Taxonomy, and Challenges

Bilal M, Gani A, Lali MIU, Marjani M, Malik N

Cyberpsychol Behav Soc Netw, 2019 Jul;22(7):433-450.
PMID: 31074639 DOI: 10.1089/cyber.2018.0670

Social media has taken an important place in the routine life of people. Every single second, users from all over the world are sharing interests, emotions, and other useful information that leads to the generation of huge volumes of user-generated data. Profiling users by extracting attribute information from social media data has been gaining importance with the increasing user-generated content over social media platforms. Meeting the user's satisfaction level for information collection is becoming more challenging and difficult. This is because of too much noise generated, which affects the process of information collection due to explosively increasing online data. Social profiling is an emerging approach to overcome the challenges faced in meeting user's demands by introducing the concept of personalized search while keeping in consideration user profiles generated using social network data. This study reviews and classifies research inferring users social profile attributes from social media data as individual and group profiling. The existing techniques along with utilized data sources, the limitations, and challenges are highlighted. The prominent approaches adopted include Machine Learning, Ontology, and Fuzzy logic. Social media data from Twitter and Facebook have been used by most of the studies to infer the social attributes of users. The studies show that user social attributes, including age, gender, home location, wellness, emotion, opinion, relation, influence, and so on, still need to be explored. This review gives researchers insights of the current state of literature and challenges for inferring user profile attributes using social media data.
Fulltext Inculcating halal values in seaweed production for competitive positioning

Normawaty Mohammad Noor, Sarina Muhammad Noor, Weliyadi, Rukisah Salleh

International Medical Journal Malaysia, 2018;17(101):37-40.
MyJurnal

Seaweed industry is important in several countries including Malaysia, Japan, Indonesia, and the Philippines. The seaweed, Kappaphycus is widely used in a variety of food products as an excellent nutritional supplement. There are several stages in producing raw Kappaphycus for industry such as cultivation and harvest. Most of these steps follow a traditional way which has been practiced from one generation to another. As seaweed is part of the main ingredients in many final produce, its processing must incorporate cleanliness and quality aspect. Therefore, a focus on Halal is of utmost importance. Halal is a concept that stresses on shariah law and ensuring the utmost quality which benefits most producers especially in food and supplement products. However, the knowledge of Halal is still limited in marine production including seaweed. The seaweed process has gone through numerous stages yet none of them has been checked on its
Halalness aspect. This study is to deliberate on the aspect of Halalness for each stage involved, including cultivation and harvesting. To achieve this, observations and literature search were performed and findings showed that there is lack of hygienic practices in handling seaweed production. Therefore, conjoint initiatives among university-industry-government are needed to enhance the value proposition of the seaweed production as it complies with the concept of Halalness. This will contribute towards the development of Halal ecosystem from seed to harvest of quality seaweed production.
Rejection of oil emulsion using tubular surface filters

Cumming IW, Holdich RG, Muhammad Abbas Ahmad Zaini

Sains Malaysiana, 2013;42:159-166.

This study was aimed to characterize the rejection of oil emulsion by two tubular surface filters, namely 13 μm slots and 4 μm circular pores. A 17 mm helix was incorporated inside the filters to increase the wall shear stress. Rejection of oil, throughputs and flux decay were measured at varying shear stresses (Rw) and transmembrane pressures (TMP). The results showed that the13 μm slots produced a fairly good oil rejection of 22 μm at Rw=0.26 Pa and TMP=6.9 kPa, while the circular pores gave the rejection of 14.4 μm at Rw=0.21 Pa and TMP=34.5 kPa. The results suggested that the circular pores filter could achieve a better oil retention under lower TMP, while the slots filter could be satisfactorily operated under moderate shear stress and low TMP. The increase of TMP offered poor oil rejection by both filters and this was also true for slots-helix configuration.
Kesan penggunaan inulin dan coklat berinulin terhadap pertumbuhan in vitro bifidobakteria

Norhayati Hussain, Muhammad Anas Othaman, Mohd Khan Ayob

Sains Malaysiana, 2012;41:1223-1231.

Coklat adalah salah satu daripada makanan pembekal tenaga segera dan mempunyai kandungan antioksida yang tinggi. Dalam kajian ini, fungsi coklat telah ditingkatkan dengan menjadikannya sebagai pembawa bahan prebiotik melalui penukaran keseluruhan kandungan gula dengan inulin. Ujian awal telah dilakukan untuk memilih kepekatan atau dos inulin yang paling sesuai sebagai sumber karbon untuk merangsang pertumbuhan bifidobakteria dalam fermentasi kultur kelompok selama 24 jam dengan menilai kesannya terhadap perubahan kepekatan sel. Ujian dilakukan terhadap 4 strain bifidobakteria iaitu Bifidobacterium longum BB536, B. breve ATCC 15700, B. infantis ATCC 15697 dan B. pseudocatenulatum G4. Keputusan menunjukkan kesemua strain bifidobakteria mampu menggunakan inulin sebagai sumber karbon pada kepekatan 2, 5, 10 hinggalah 15 g/L inulin. Manakala kepekatan 5 g/L inulin dilihat mampu digunakan secara optimum (tiada perbezaan signifikan pada p>0.05) oleh keempat-empat spesies bifidobakteria tersebut. Inulin pada kepekatan 5 g/L telah digunakan untuk menghasilkan produk coklat susu (MC-1) dan coklat gelap (DC-2) berinulin, yang seterusnya dinilai kemampuan produk merangsang pertumbuhan spesis bifidobakteria berkenaan secara in vitro. Didapati wujud korelasi negatif yang signifikan (p<0.01) antara pertambahan bilangan bifidobakteria dan pH untuk setiap kultur tulen B. pseudocatenulatum G4, B. Infantis, B. Breve (masing-masing r= -0.97) dan B. longum BB536 (r= -0.95). Inulin dengan kepekatan 5 g/L telah digunakan sebagai ramuan produk coklat berinulin atau prebiotik. Ia didapati dapat meningkatkan pertumbuhan keempat-empat spesis bifidobakteria berkenaan dengan lebih berkesan berbanding penggunaan inulin sahaja sebagai sumber karbon.
New hybridization approach of titanium organometallic: PANi thin films as room temperature gas sensors

Izura Izzuddin, Mohammad Hafizuddin Jumali, Muhammad Yahaya, Muhamad Mat Salleh

Sains Malaysiana, 2012;41:1017-1021.

The aim of this research was to investigate the ability of organometallic titanium-PANi hybrid materials as gas sensor at room temperature. To form the hybrid materials, commercially available polyaniline (PANi) powder were directly added into organometallic titanium sols which was synthesized using the sol gel method. The composite films were prepared via spin coating technique followed by electrode deposition for sensors fabrication. Five different organometallic titanium:PANi ratios namely 1 wt% to 5 wt% of PANi were prepared for this experiment. For gas sensing test, all samples were exposed to ethanol vapour. The sensing mode is based on the variation in the electrical conductivity due to the
interaction between the gas molecules and the film. It was observed that the composite sensors required appropriate ratio to exhibit optimum sensing properties. This finding proved that the hybridization process is successful and offered much cheaper and easier method for fabrication of room temperature gas sensor.
Impact of peer bullying on school students with and without ADHD symptoms: a cross-sectional study from Pakistan

Saleem M, Ismail R, Arena CK, Zakaria E

Jurnal Psikologi Malaysia, 2015;olume 29:61-70.

The present study aims to identify the impact of peer bullying on school students with and without ADHD symptoms. Sample comprised of one thousand (N=1000) school going children with an age range 9-15 years whom belong to grades 6-10, were selected by using purposive sampling technique, taken from two major cities of Southern Punjab (Multan & Bahawalpur) Pakistan. Two scales were used for data collection; Conners Teacher Rating Scale â€“ (Revised) developed by Â© Conners (1997), followed by Olweus Bullying Questionnaire by Â© Olweus (2007). Tools were formally validated with translating into native language (i.e. Urdu) and employing pilot study. ANOVA, standard deviation, Z-test, and mean were calculated using SPSS (21.0) to process the results. Findings suggest (Z=10.096, P-Value=0.000) showing that there is significant difference between the mean scores of bullying with ADHD and without ADHD students. However, results on gender indicated (Z=1.769, P-Value=0.077) that there is significant difference between the impact of bullying on boys and girls. Results also show (F= 7.783, P= 0.000) that there is significant difference of bullying impact among all the grade students at 5% level of significance. Limitations of the study and recommendations for future research are also enclosed.
Fulltext Kecerdasan emosi dan motivasi kerja dalam kalangan subordinat MARDI

Amira W, Muhammad Ajib Abd R, Fatimah Y

Jurnal Psikologi Malaysia, 2016;30:52-60.

The objective of this study is to identify whether emotional intelligence among employees between grades N17 to N27 substantially affects their work motivation in the organisation of Mardi. This study used the instruments of Emotional Competence Inventory (ECI) and Employee Performance Measure. Data were collected by using questionnaires that were distributed to 50 staffs in Human Resources Management Division, Headquarters of MARDI, Serdang, Selangor. The results of correlation analysis showed that the relationship between emotional intelligence and motivation among employees in Grade 17 to 27 that are working in MARDI is not significant. In addition, the different levels of emotional intelligence according to their positions were not significant, however, for different levels of self-motivation by grade showed a significant and positive relationship. The research findings can give a good benefit to MARDI Division Human Resources Management in the effort of improving the quality of work and services among support staffs.
Fulltext Depression and its relationship to loneliness and life events among urban poor in the federal territory, Kuala Lumpur, Malaysia

Siti Nor Radhiah Muhammad Y, Nor Ba’yah Abdul K

Jurnal Psikologi Malaysia, 2016;30:133-141.

This study examines the relationship between loneliness, life events and depression among 178 adults in the disadvantage community of Malaysia and to determine predictors of depression. A set of standardized questionnaires was used to measure depression, loneliness and stressful life events. The results showed that loneliness and stressful life events were related to depression. Results also showed that loneliness was a predictor of depression. Implications of the study in terms of theory and practice are also discussed.
Fulltext UV-visible chemometrics approach for the determination of selected adulterants in claimed premixed coffee

Muhammad Zul Fayyadh Azizo Rahman, Chong, Hui Wen, Lim, Vuanghao

Malaysian Journal of Medicine and Health Sciences, 2018;14(102):1-6.
MyJurnal

Adulterated premixed coffees have turned into an issue in Malaysia lately and have caught the eye of the authorities due to death reports linked to these products. The major cause of this issue is reported that these premixed coffees have passed food inspection test and eventually released to the market for public consumption. These coffees were claimed to be spiked with several sexual enhancers like sildenafil, tadalafil, and vardenafill, which are common drugs used to treat erectile dysfunction. Methods: Chemometrics approach using UV-Vis spectroscopy was developed to detect the selected sexual enhancer drugs found in commercial coffees by employing SIMCA-P software for the multivariate statistical analysis. Seven brands of coffee samples were purchased from local stores, and 30 sachets each were tested, hence totalling to 210 samples. Each sample was named H, J, G, W, N, T, and K, respectively. Results: Three multivariate models were generated, namely principal component analysis (PCA), orthogonal partial least squares discriminant analysis (OPLS-DA), and partial least squares discriminant analysis (PLS-DA). OPLS-DA was selected as the best model for the overall results as it displayed minimal discriminate. Sildenafil, tadalafil, and vardenafil were detected in sample H, while vardenafil in brand J, and none in samples G, W, N, T, and K. Conclusion: OPLS-DA analysis showed discrimination for the sexual enhancer drugs in two brands of premixed coffee. The UV-Vis spectroscopy-based chemometrics method proved to be reliable and efficient in determining the selected drugs, as well as in saving time and cost.
Microstructural characterization of Au-In thin film deposited by electron beam evaporation

Norliza Ismail, Muhammad Azmi Abdul Hamid, Azman Jalar

Sains Malaysiana, 2009;38.

The microstructure and phase formation of Au-In thin film deposited by e-beam evaporation technique has been studied. Single crystals of rocksalt were used as the substrates. The chamber pressure during deposition was about 2.5 × 10-5 torr and substrate temperature was 35°C. Three types of samples were prepared namely Au, In and Au-In thin films. Microstructure and chemical composition of these thin films were characterized by transmission electron microscopy (TEM) and X-ray photoelectron spectrometer (XPS) respectively. TEM micrograph reveals island structures for both Au and In thin film on the rocksalt substrate, with the In island size distribution is about 9-30 nm compared to Au island in the range of 3-10 nm. The growth of islands instead of smooth film indicates that Au and In thin films follow the Volmer-Weber growth mode. However, island structures were not present on Au-In thin films which most probably follow the Frank van de Merwe growth mode. XPS analysis indicates intermetallic compound was not present in the Au-In thin film suggesting that diffusion process in the interface of Au and In films is minimal.
Effect of ZrO2 addition on microstructure, morphology and pressure sensing behaviour of Pb(ZrxTi1-x)O3 ceramics sintered in Al2O3 environment

Norhashimah Ramli, Muhammad Yahaya, Mohammad Hafizuddin Jumali, Muhamad Mat Salleh

Sains Malaysiana, 2009;38.

The effect of ZrO2 addition on the microstructure, morphology and pressure sensing behaviour of Pb(ZrxTi1-x)O3 ceramics was studied in five different compositions of ZrO2, namely x = 0.48, 0.50, 0.52, 0.54 and 0.56. The samples were prepared through the solid-state reaction method using high purity metal oxides powders. In order to control the PbO losses due to high temperature sintering, a novel approach were explored whereby the samples were sintered in Al2O3 environment. Structural investigation using X-ray diffraction (XRD) method revealed that all samples exhibited a tetragonal crystal structure. However the c/a lattice parameters ratios exhibited a decreasing trend as the ZrO2 content was increased, indicating that PZT crystals gradually evolved towards pseudocubic structure. SEM micrographs showed different morphology of each composition with the grain size varies in the range of 1.5 μm to 3.15 μm. The performance of pressure sensing behaviour showed that sample with composition x = 0.52 exhibited the best piezoelectric properties with high sensitivity. However, all samples failed to show good stability and repeatability due to slow recovery after severe lattice strain.
Tio2 nanoparticles coated with porphyrin dye thin film as fluorescence gas sensor

Nurul Huda Yusoff, Muhamad Mat Salleh, Muhammad Yahaya

Sains Malaysiana, 2008;37:233-237.

This research explores the possibility of using fluorescence technique to detect the presence of volatile organic compounds based on a single sensing material. The material used was TiO2 nanoparticles coated with porphyrin dye. The TiO2 nanoparticles colloid is in a sol-gel form synthesized from titanium (IV) ethoxide in ethanol with addition of kalium chloride (KCl) as stabilizer. TiO2 nanoparticles were then coated with porphyrin dye, Manganase (III) 5,10,15,20 tetra (4-pyridyl)-21H, 23H porphine chloride tetrakis (metachloride). The coated nanoparticles were deposited on quartz substrate using self-assembly through dip coating technique. The sensing properties of the thin film toward volatile organic compounds; ethanol, acetone, cyclohexane and 2-propanol were studied using luminescence spectrometer. It was found that the thin film produced different emission spectra peaks for different volatile organic compounds (VOCs). Hence, it eases chemical identification process and potentially be use as fluorescence gas sensor.
Detection of volatile organic compound gas using localized surface plasmon resonance of gold nanoparticles

Nengsih S, Umar AA, Muhamad Mat Salleh, Muhammad Yahaya

Sains Malaysiana, 2011;40.

This paper reports on the detection of several organic vapors using the unique characteristic of localized surface plasmon resonance (LSPR) gold nanoparticles. Gold nanoparticles on quartz substrate were prepared using seed mediated growth method. In a typical process, gold nanoparticles with average size ca. 36 nm were obtained to densely grown on the substrate. Detection of gas was based on the change in the LSPR of the gold nanoparticles film upon the exposure to the gas sample. It was found that gold nanoparticles were sensitive to the presence of volatile organic compound (VOC) gas from the change in the surface plasmon resonance (SPR) intensity. The mechanism for the detection of VOC’s gas will be discussed.
Chemical synthesis of metal nanoparticles in aqueous solutions with the presence of some additives

Oyama M, Akrajasali Umar, Muhammad M Atsalleh, Burhanuddin Eopmajlis

Sains Malaysiana, 2011;40:1345-1353.

Metal nanoparticles having interesting shapes can be prepared in aqueous solutions through simple reductions of metal ions with the presence of some additive reagents, such as cetyltrimethylammonium bromide and hexamethylenetetramine. In this review, some successful results for shape-controlled synthesis of metal nanoparticles in our group are summarized, which includes the synthesis of palladium nanocubes, palladium nanobricks, gold nanotripods. In addition, combining with indium tin oxide electrode surfaces, shape-controlled growth is shown to be possible to form gold nanoplates and copper oxide nanowires. Even in relatively mild synthetic conditions, interesting shape-controlled synthesis of metal nanoparticles is possible.
Fulltext The effect of burned liver on the length, weight and development of Megaselia Scalaris (loew) (diptera: phoridae) – a preliminary assessment and implications in forensic entomology

Nur Aqidah Ahmad, Amirah Suhailah Ramli, Raja Muhammad Zuha

Jurnal Sains Kesihatan Malaysia, 2018;16(1):29-33.
MyJurnal

Development of insects in laboratory for minimum post mortem interval estimation (mPMI) or time of colonisation (TOC) in
forensic entomology can be affected by the type and quality of food consumed during larval period. Since mPMI estimation
also involves analysis of larval specimens collected from burned human remains, it is important to study if burned tissues
could affect growth of sarcosaprophagous larvae. This study investigated the effect of burned tissues on the size and
developmental period of Megaselia scalaris (Loew) (Diptera: Phoridae), a species of forensic importance. Development
of M. scalaris on 75 g burned cow’s liver was compared with control liver in three study replicates. Mean larval length
(2.87 ± 0.11 mm) and weight (0.81 ± 0.08 mg) of M. scalaris larvae in burned liver diets were significantly lower than
larval length (5.03 ± 0.15 mm) and weight (2.85 ± 0.21 mg) of control liver diets (p < 0.001) whilst mean pupal length
(2.53 ± 0.06 mm) and weight (0.92 ± 0.06 mg) in burned liver diets were significantly lower than pupal length (3.52 ±
0.06 mm) and weight (2.84 ± 0.16 mg) in control liver diets (p < 0.001). Development of larvae in burned liver was 5-9
hours slower than those feeding on control liver based on single observation. Although the assessment is preliminary, the
findings indicate physical growth of larvae feeding on burned animal tissues was affected and entomological specimens
recovered from burned remains should be evaluated carefully to avoid errors in mPMI/TOC estimation. Limitations and
suggestions for further research are also presented herein.
Fulltext Effect of active cycle of breathing technique in adult asthmatic patients in Pakistan

Sundus, S., Memoona, S., Muhammad, I. N., Rashid, H. N.

Asian Journal of Medicine and Biomedicine, 2018;1(1):32-37.
MyJurnal

Asthma is one of the chronic and long-term diseases of the airways. It is characterized by reversible airflow obstruction, chest tightness, and dyspnea with decreased work of breathing. The inside airway’s walls are swollen or inflamed. The aim of this study was to determine the effectiveness of active cycle of breathing technique as an airway clearance technique in patients with asthma. The health-related quality of life and functional capacity of patients was measured using a standardized airway questionnaire (AQ20) and six-minute walk test. The study was cohort design included 38 patients (mean age 41.131±14.711) of both genders with mild to moderate asthma. Each patient received multiple sessions (3 times/week for one month) of active cycle of breathing technique. Pre and post-treatment measures were recorded for functional capacity and health-related quality of life in the form of six-minute walk test and standardized airway questionnaire. All 38 patients were stable during the study period. The health-related quality of life and functional capacity of patient significantly improved post-treatment sessions with means [205.375±93.594 for week 1, 1248.719±112.187 for week 2, 306.429±140.5554 for week 3, 337.245±134.389 for week 4], for six-minute wall test and mean difference 4.13± 2.3 SD for standardized airway questionnaire with p-value (0.00) significant upon paired t-test. It is concluded that the active cycle of breathing technique is very beneficial intervention for improving quality of life and functional capacity of patients with mild to moderate asthma. Further, investigations are required to explore efficiency of ABCT as a tool for cardio-pulmonary rehabilitation.
Fulltext Validity and reliability of falls screening mobile application (FallSA) to inform falls risk among Malaysian community dwelling older adults

Muhammad Iqbal Shaharudin, Devinder Kaur Ajit Singh, Suzana Shahar

Jurnal Sains Kesihatan Malaysia, 2018;16(101):223-224.
MyJurnal

Falls is a global health concern due to its many negative consequences in older adults. Early falls screening and prevention is important among older adults. We developed Falls Screening Mobile Application (FallSA) as a self falls screening tool among older adults. FallSA was developed using data of physical performance test, demographic information and questions to inform falls risk from a larger population based longitudinal study on neuroprotective model for healthy longevity among older adults (LRGS TUA). The aim of this study was to determine validity and reliability of FallSA as a self-screening tool to inform falls risk among Malaysian older adults. This cross sectional study was conducted among 91 community dwelling older adults aged 60 years and above. FallSA was validated against Physiological Profile Assessments (PPA), a comprehensive falls risk assessment tool. Participants used FallSA to test their falls risk by repeating the test twice between an hour. Validity and test–retest reliability of FallSA was examined by using Spearman correlation, Kappa, Sensitivity and Specificity, Intra correlation coefficient (ICC), Cronbach alpha and Bland-Altman. Concurrent validity test was significant with moderate correlation rs = 0.518, p < 0.001, moderate agreement K = 0.516, p < 0.001 and acceptable Sensitivity: 80.4% and Specificity: 71.1%. Reliability of FallSA was shown to be good (ICC: 0.948, CI: 0.921-0.966), good internal consistency α = 0.948, p < 0.001 and good agreement was indicated by small mean differences and narrow limits of agreement (LoA). The results of this study suggest that FallSA was a valid and reliable tool to inform falls risk among Malaysian older adults. Further prospective studies are required to determine the accuracy of FallSA to correctly classify older adults into fallers and non-faller groups.
UV-C irradiation affects quality, antioxidant compounds and activity of Musa AAA Berangan

Phebe Ding, Muhammad Firdaus Rosli, Nur Ayuni Mahassan

Sains Malaysiana, 2015;44:1095-1101.

A study to determine the effects of ultraviolet-C (UV-C) irradiation on fruit quality, antioxidant compounds and activities of Musa AAA Berangan was carried out. The mature green fruits were exposed to UV-C doses of 0, 0.01, 0.02, 0.03 and 0.04 kJ/m2 and allowed to ripen at 25±2o C for 5 days. Peel and pulp color, water loss, firmness, soluble solids concentration (SSC), titratable acidity, pH, vitamin C, total phenolic contents (TPC) and antioxidant activity (assay using ferric-reducing antioxidant power (FRAP), 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azinobis-(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS) free radical-scavenging) were analyzed at day 0, 1, 3 and 5 after ripening. The peel color (L*, C* and ho) of Berangan banana decreased as UV-C irradiation dose increased. UV-C irradiated fruit has lower water loss, firmer pulp and lower SSC than control. The fruit could undergo normal ripening albeit the quality of fruit has been affected by UV-C irradiation. There was significant interaction between UV-C radiation x day after ripening on TPC of Berangan banana. Fruit irradiated with UV-C showed significant higher of TPC as compared with control at later stage of ripening. Antioxidant activities measured with the three assays showed a significant decrease as ripening progressed. The results of this study showed that UV-C radiation as low as 0.01 kJ/m2 is able to reduce water loss, slow down starch conversion and softening and enhanced TPC of Berangan banana.

Filters

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links