Displaying publications 81 - 100 of 134 in total

Abstract:
Sort:
  1. Mechanical and antibacterial properties of paper coated with chitosan
    Sarani Zakaria, Chin HC, Wan Haslinda Wan Ahmad, Hatika Kaco, Soon Wei Chook, Chi HC
    Sains Malaysiana, 2015;44:905-911.
    Recent developments have found the viability of chitosan as a new alternative additive in the pulp and paper technology.
    This study was carried out to investigate the effect of chitosan as a paper coating which were prepared by dissolution in
    acetic acid solution. The mechanical properties of coated paper were improved significantly compared with non-coated
    paper. The FT-IR spectra showed peak evolution at 1558 cm-1 for coated paper due to the existence of amine group. Since
    FT-IR spectra for the coated paper was almost identical to the chitosan spectrum, it is assumed that there is an obvious
    physical interaction rather than the chemical interaction. The SEM micrographs showed that some of the chitosan has
    occupied the pores and some of them adhered only on the surface. This may be due to the chemical similarities between
    cellulose and chitosan which enhanced the strength of fiber matrixes via hydrogen bonding. The antibacterial property
    of coated paper showed that chitosan in dried form has no significant effect but effective when applied as wet solution.
    Matched MeSH terms: Acetates
  2. Metal-Polydopamine Framework as an Effective Fluorescent Quencher for Highly Sensitive Detection of Hg(II) and Ag(I) Ions through Exonuclease III Activity
    Ravikumar A, Panneerselvam P, Morad N
    ACS Appl Mater Interfaces, 2018 Jun 20;10(24):20550-20558.
    PMID: 29792319 DOI: 10.1021/acsami.8b05041
    In this paper, we propose a metal-polydopamine (MPDA) framework with a specific molecular probe which appears to be the most promising approach to a strong fluorescence quencher. The MPDA framework quenching ability toward various organic fluorophore such as aminoethylcoumarin acetate, 6-carboxyfluorescein (FAM), carboxyteramethylrhodamine, and Cy5 are used to establish a fluorescent biosensor that can selectively recognize Hg2+ and Ag+ ions. The fluorescent quenching efficiency was sufficient to achieve more than 96%. The MPDA framework also exhibits different affinities with ssDNA and dsDNA. In addition, the FAM-labeled ssDNA was adsorbed onto the MPDA framework, based on their interaction with the complex formed between MPDA frameworks/ssDNA taken as a sensing platform. By taking advantage of this sensor, highly sensitive and selective determination of Hg2+ and Ag+ ions is achieved through exonuclease III signal amplification activity. The detection limits of Hg2+ and Ag+ achieved to be 1.3 and 34 pM, respectively, were compared to co-existing metal ions and graphene oxide-based sensors. Furthermore, the potential applications of this study establish the highly sensitive fluorescence detection targets in environmental and biological fields.
    Matched MeSH terms: Acetates
  3. Method development for determination of fluroxypyr in soil
    Halimah M, Tan YA, Ismail BS
    J Environ Sci Health B, 2004;39(5-6):765-77.
    PMID: 15620085
    Four methods were developed for the analysis of fluroxypyr in soil samples from oil palm plantations. The first method involved the extraction of the herbicide with 0.05 M NaOH in methanol followed by purification using acid base partition. The concentrated material was subjected to derivatization and then cleaning process using a florisil column and finally analyzed by gas chromatography (GC) equipped with electron capture detector (ECD). By this method, the recovery of fluroxypyr from the spiked soil ranged from 70 to 104% with the minimum detection limit at 5 microg/kg. The second method involved solid liquid extraction of fluroxypyr using a horizontal shaker followed by quantification using high performance liquid chromatography (HPLC) equipped with UV detector. The recovery of fluroxypyr using this method, ranged from 80 to 120% when the soil was spiked with fluroxypyr at 0.1-0.2 microg/g soil. In the third method, the recovery of fluroxypyr was determined by solid liquid extraction using an ultrasonic bath. The recovery of fluroxypyr at spiking levels of 4-50 microg/L ranged from 88 to 98% with relative standard deviations of 3.0-5.8% with a minimum detection limit of 4 microg/kg. In the fourth method, fluroxypyr was extracted using the solid liquid extraction method followed by the cleaning up step with OASIS HLB (polyvinyl dibenzene). The recovery of fluroxypyr was between 91 and 95% with relative standard deviations of 4.2-6.2%, respectively. The limit of detection in method 4 was further improved to 1 pg/kg. When the weight of soil used was increased 4 fold, the recovery of fluroxypyr at spiking level of 1-50 microg/kg ranged from 82-107% with relative standard deviations of 0.5-4.7%.
    Matched MeSH terms: Acetates/analysis*
  4. Method development for determination of fluroxypyr in water
    Halimah M, Tan YA, Aini K, Ismail BS
    J Environ Sci Health B, 2003 Jul;38(4):429-40.
    PMID: 12856925
    Improved methods for extraction and clean up of fluroxypyr residue in water have been established. Two methods of fluroxypyr extraction were used, namely, Direct Measurement of fluroxypyr and Concentration of fluroxypyr onto A Solid Phase Extraction (SPE) Adsorbent, followed by elution with solvent before determination of fluroxypyr. The recovery for Direct Measurement of fluroxypyr in water containing 8-100 microg L(-1), ranged from 86 to 110% with relative standard deviation of 0.7 to 2.15%. For the second method, three types of SPE were used, viz. C18, C18 end-capped and polyvinyl dibenzene (ISOLUTE ENV+). The procedure involved concentrating the analyte from fluroxypyr-spiked water at pH 3, followed by elution of the analyte with 4 mL of acentonitrile. The recovery of fluroxypyr from the spiked sample at 1 to 50 microg L(-1) after eluting through either C18 or C18 end-capped ranged from 40-64% (with relative standard deviation of 0.7 to 2.15) and 41-65% (with standard deviation of 1.52 to 11.9). The use of ISOLUTE ENV+, gave better results than the C18, C18 end-capped or the Direct Measurement Methods. The recovery and standard deviation of fluroxypyr from spiked water using ISOLUTE ENV+ ranged from 91-102% and 2.5 to 5.3, respectively.
    Matched MeSH terms: Acetates/analysis*; Acetates/isolation & purification
  5. Methyl jasmonate-induced compositional changes of volatile organic compounds in Polygonum minus leaves
    Rahnamaie-Tajadod R, Goh HH, Mohd Noor N
    J Plant Physiol, 2019 Sep;240:152994.
    PMID: 31226543 DOI: 10.1016/j.jplph.2019.152994
    Polygonum minus Huds. is a medicinal aromatic plant rich in terpenes, aldehydes, and phenolic compounds. Methyl jasmonate (MeJA) is a plant signaling molecule commonly applied to elicit stress responses to produce plant secondary metabolites. In this study, the effects of exogenous MeJA treatment on the composition of volatile organic compounds (VOCs) in P. minus leaves were investigated by using a metabolomic approach. Time-course changes in the leaf composition of VOCs on days 1, 3, and 5 after MeJA treatment were analyzed through solid-phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS). The VOCs found in MeJA-elicited leaves were similar to those found in mock-treated leaves but varied in quantity at different time points. We focused our analysis on the content and composition of monoterpenes, sesquiterpenes, and green leaf volatiles (GLVs) within the leaf samples. Our results suggest that MeJA enhances the activity of biosynthetic pathways for aldehydes and terpenes in P. minus. Hence, the production of aromatic compounds in this medicinal herb can be increased by MeJA elicitation. Furthermore, the relationship between MeJA elicitation and terpene biosynthesis in P. minus was shown through SPME-GC-MS analysis of VOCs combined with transcriptomic analysis of MeJA-elicited P. minus leaves from our previous study.
    Matched MeSH terms: Acetates/administration & dosage; Acetates/pharmacology*
  6. MicroRNA profiling in MDA-MB-231 human breast cancer cell exposed to the Phaleria macrocarpa (Boerl.) fruit ethyl acetate fraction (PMEAF) through IIlumina Hi-Seq technologies and various in silico bioinformatics tools
    Kavitha N, Vijayarathna S, Shanmugapriya, Oon CE, Chen Y, Kanwar JR, et al.
    J Ethnopharmacol, 2018 Mar 01;213:118-131.
    PMID: 29154802 DOI: 10.1016/j.jep.2017.11.009
    ETHNOPHARMACOLOGICAL RELEVANCE: Phaleria macrocarpa (Scheff) Boerl, is a famous traditional medicinal plant which exhibited cytotoxicity against various cancerous cells. Traditionally, P. macrocarpa has been used to control cancer, impotency, hemorrhoids, diabetes mellitus, allergies, liver and heart disease, kidney disorders, blood diseases, acne, stroke, migraine, and various skin diseases.

    AIM OF THE STUDY: Recent studies have demonstrated a potent anticancer potential of P. macrocarpa, especially against HeLa cell. The objective of this study was to investigate the regulation of miRNAs on MDA-MB-231 treated with P. macrocarpa ethyl acetate fraction (PMEAF).

    MATERIALS AND METHODS: The regulation of miRNAs on MDA-MB-231 cells treated with PMEAF was studied through IIlumina, Hi-Seq. 2000 platform of Next Generation Sequencing (NGS) and various in silico bioinformatics tools.

    RESULTS: The PMEAF treatment against MDA-MB-231 cells identified 10 upregulated and 10 downregulated miRNAs. A set of 606 target genes of 10 upregulated miRNAs and 517 target genes of 10 downregulated miRNAs were predicted based on computational and validated databases by using miRGate DB Query. Meanwhile, results from DAVID Bioinformatics Resources 6.8 specified the functional annotation of the upregulated miRNAs involvement in cancer pathway by suppressing the oncogenes and downregulating miRNAs by expressing the tumour suppressor genes in the regulation of apoptosis pathway.

    CONCLUSION: In conclusion, the results of this study proved that PMEAF is a promising anticancer agent with high cytotoxicity against MDA-MB-231 breast cancer cells and it induced apoptotic cell death mechanism through the regulation of miRNAs. PMEAF might be the best candidate for developing more potent anticancer drugs or chemo preventive supplements.

    Matched MeSH terms: Acetates/chemistry
  7. Mobility Studies of (14)C-Chlorpyrifos in Malaysian Oil Palm Soils
    Halimah M, Ismail BS, Nashriyah M, Maznah Z
    Bull Environ Contam Toxicol, 2016 Jan;96(1):120-4.
    PMID: 26546229 DOI: 10.1007/s00128-015-1685-3
    The mobility of (14)C-chlorpyrifos using soil TLC was investigated in this study. It was found that chlorpyrifos was not mobile in clay, clay loam and peat soil. The mobility of (14)C-chlorpyrifos and non-labelled chlorpyrifos was also tested with silica gel TLC using three types of developing solvent hexane (100%), hexane:ethyl acetate (95:5, v/v); and hexane:ethyl acetate (98:2, v/v). The study showed that both the (14)C-labelled and non-labelled chlorpyrifos have the same Retardation Factor (Rf) for different developing solvent systems. From the soil column study on mobility of chlorpyrifos, it was observed that no chlorpyrifos residue was found below 5 cm depth in three types of soil at simulation rainfall of 20, 50 and 100 mm. Therefore, the soil column and TLC studies have shown similar findings in the mobility of chlorpyrifos.
    Matched MeSH terms: Acetates
  8. Montelukast Reduces the Risk of Dengue Shock Syndrome in Dengue Patients
    Ahmad A, Waseem T, Butt NF, Randhawa FA, Malik U, Shakoori TA
    Trop Biomed, 2018 Dec 01;35(4):1115-1122.
    PMID: 33601858
    A significant percentage of dengue patients develop Dengue Shock Syndrome (DSS) which is characterized by increased vascular permeability, circulatory failure and often death. Montelukast, a cysteinyl leukotriene receptor antagonist regulates vascular permeability and we hypothesized that it may be effective in protecting against DSS. An open label, parallel, randomized controlled trial (RCT) was thus carried out at Mayo Hospital, Department of Medicine, Lahore. A total of 200 patients of dengue fever were recruited and randomized into two groups. The group A was treated with Montelukast 10 mg once daily for 5 days along with general supportive treatment. Group B received the standard supportive treatment and served as the control group. The frequency of DSS was compared in the two groups by Chi square test. A binary logistic regression analysis was conducted to assess the effects of montelukast treatment on onset of DSS after adjusting for gender, age, white cell count, platelet count, haematocrit, serum alanine transaminase (ALT) and aspartate transaminase (AST). Relative risk (RR), absolute risk reduction (ARR), relative risk reduction (RRR) and numbers needed to treat (NNT) were calculated. Significance level was set at p0.001, Odds ratio=5.01, 95% CI=2.17-11.60) even after adjusting for confounders. Montelukast reduced the absolute risk (ARR=22%) and the relative risk (RRR=71%) of DSS in dengue fever. Numbers needed to treat were 4.55. We thus conclude that treatment with oral montelukast may protect patients of dengue fever from DSS and greatly reduce mortality.
    Matched MeSH terms: Acetates
  9. Fulltext Montelukast in children with allergic rhinitis amid COVID-19 pandemic
    Kow CS, Hasan SS
    Acta Paediatr, 2020 10;109(10):2151.
    PMID: 32686128 DOI: 10.1111/apa.15491
    Matched MeSH terms: Acetates
  10. Fulltext Montelukast sodium-induced hypomania
    Zainal, N.Z., Tan, T.Y
    Malaysian Journal of Psychiatry, 2015;24(1):96-98.
    MyJurnal
    Objective: A rare case of induced hypomania was reported. Method: Patient was a 78-year-old Indian female with squamous cell carcinoma of the nasal septum, childhood bronchial asthma and underlying bipolar disorder. Her bipolar disorder is currently in remission. She developed hypomanic symptoms after one week of initiation of montelukast sodium for treatment of acute exacerbation of bronchial asthma. Result: Her hypomanic symptoms improved after stopping usage of montelukast sodium. Conclusion: Montelukast sodium likely had induced hypomania in this patient.
    Matched MeSH terms: Acetates
  11. Fulltext Nephroprotective effects of Zingiber zerumbet Smith ethyl acetate extract against paracetamol-induced nephrotoxicity and oxidative stress in rats
    Abdul Hamid Z, Budin SB, Wen Jie N, Hamid A, Husain K, Mohamed J
    J Zhejiang Univ Sci B, 2012 Mar;13(3):176-85.
    PMID: 22374609 DOI: 10.1631/jzus.B1100133
    Paracetamol (PCM) overdose can cause nephrotoxicity with oxidative stress as one of the possible mechanisms mediating the event. In this study, the effects of ethyl acetate extract of Zingiber zerumbet rhizome [200 mg per kg of body weight (mg/kg) and 400 mg/kg] on PCM-induced nephrotoxicity were examined. Rats were divided into five groups containing 10 rats each. The control group received distilled water while other groups were treated with extract alone (400 mg/kg), PCM alone (750 mg/kg), 750 mg/kg PCM+200 mg/kg extract (PCM+200-extract), and 750 mg/kg PCM+400 mg/kg extract (PCM+400-extract), respectively, for seven consecutive days. The Z. zerumbet extract was given intraperitoneally concurrent with oral administration of PCM. Treatment with Z. zerumbet extract at doses of 200 and 400 mg/kg prevented the PCM-induced nephrotoxicity and oxidative impairments of the kidney, as evidenced by a significantly reduced (P<0.05) level of plasma creatinine, plasma and renal malondialdehyde (MDA), plasma protein carbonyl, and renal advanced oxidation protein product (AOPP). Furthermore, both doses were also able to induce a significant increment (P<0.05) of plasma and renal levels of glutathione (GSH) and plasma superoxide dismutase (SOD) activity. The nephroprotective effects of Z. zerumbet extract were confirmed by a reduced intensity of renal cellular damage, as evidenced by histological findings. Moreover, Z. zerumbet extract administered at 400 mg/kg was found to show greater protective effects than that at 200 mg/kg. In conclusion, ethyl acetate extract of Z. zerumbet rhizome has a protective role against PCM-induced nephrotoxicity and the process is probably mediated through its antioxidant properties.
    Matched MeSH terms: Acetates
  12. Fulltext Neuroprotective effects of 1`δ-1`-acetoxyeugenol acetate on Aβ(25-35) induced cognitive dysfunction in mice
    Jayasingh Chellammal HS, Veerachamy A, Ramachandran D, Gummadi SB, Manan MM, Yellu NR
    Biomed Pharmacother, 2019 Jan;109:1454-1461.
    PMID: 30551397 DOI: 10.1016/j.biopha.2018.10.189
    The progressive accumulation of amyloid beta (Aβ) peptide is neurotoxic and leads to Alzheimer's type dementia. Accumulation of Aβ has been associated with dysfunction of hypothalamic-pituitary-adrenal (HPA) axis and elevated pro-inflammatory cytokines. In this study, we investigated the effect of 1`δ-1`-acetoxyeugenol acetate (DAEA), isolated from Alpinia galanga (L.), on Aβ(25-35) induced neurodegeneration in mice. Mice were treated with three different doses of DAEA (12.5 mg/kg, 25 mg/kg and 50 mg/kg) for 28 days. Aβ(25-35) was injected by intracerebroventricular (i.c.v.) injection on the 15th day of 28 days. Open field, water maze and step-down inhibitory tests were performed on the 27th day to determine the habituation memory, spatial learning, and short- and long-term memory, respectively. Acetylcholinesterase (AChE), Corticosterone, biogenic amines (serotonin and dopamine), tumour necrosis factor-α (TNF-α), and antioxidant parameters such as superoxide dismutase, catalase, glutathione peroxidase and vitamin C were evaluated in brain homogenates after behavioural tests to ascertain the cognitive improvement through neuro-immune-endocrine modulation. The DAEA treatment with 25 mg/kg and 50 mg/kg resulted in significant (p < 0.001) improvement of habituation memory and step-down inhibitory avoidance task. In spatial learning, the cognitive improvement was significantly improved (p < 0.001) by reduction in escape latency. In the biochemical study, the significant (p < 0.001) reduction of AChE indicates the preeminent neuroprotection. Corticosterone and TNF-α were significantly (p < 0.01) reduced and biogenic amines were increased with antioxidant markers, which signify the potential influence of DAEA on neuroprotection. Our investigation revealed that the drug DAEA attenuates stress mediated through the HPA axis and regulates the neuroendocrine and neuroimmune function to improve the cognition. DAEA could be a potential lead candidate for the treatment of neurodegeneration.
    Matched MeSH terms: Acetates/pharmacology*
  13. Neuroprotective effects of ethyl acetate extract of zingiber zerumbet (l.) smith against oxidative stress on paraquat-induced parkinsonism in rats
    Farah Wahida Ibrahim, Umi Noraashikin Zainudin, Mazlyzam Abdul Latif, Asmah Hamid
    Sains Malaysiana, 2018;47:2337-2347.
    Zingiber zerumbet has been traditionally used as an anti-inflammation and antioxidant agent. The present study
    investigates the neuroprotective effects of ethyl acetate extract of Z. zerumbet against oxidative stress on paraquat
    (PQ)-induced Parkinsonism in rats. Forty male Sprague-Dawley rats were divided into five groups: Negative control
    (normal saline), positive control (N-acetylcysteine, NAC 20 mg/kg + PQ 10 mg/kg), PQ only, 200 mg/kg Z. zerumbet +
    PQ and 400 mg/kg Z. zerumbet + PQ. The extract was given orally for 19 consecutive days and PQ was administered
    intraperitoneally on day 8-12th of the treatment regime. Both serum and fresh brains containing substantia nigra (SN)
    region were taken for biochemical and histological analysis. Administration of both 200 and 400 mg/kg ethyl acetate
    Z. zerumbet extracts to the PQ-treated groups have resulted in: Decreased levels of MDA and PC in the SN homogenates;
    and increased SOD, GPx; and CAT activities in the SN and serum. Overall, ethyl acetate extract of Z. zerumbet reduced
    oxidative stress in the SN of PQ-induced neuronal damages, therefore, has the potential to be developed as a preventive
    agent for neurodegenerative disorders caused by environmental toxins.
    Matched MeSH terms: Acetates
  14. Fulltext Novel Bi-heterocycles as Potent Inhibitors of Urease and Less Cytotoxic Agents: 3-({5-((2-Amino-1,3-thiazol-4-yl)methyl)-1,3,4-oxadiazol-2-yl}sulfanyl)-N-(un/substituted-phenyl)propanamides
    Abbasi MA, Ramzan MS, Ur-Rehman A, Siddiqui SZ, Hassan M, Ali Shah SA, et al.
    Iran J Pharm Res, 2020;19(1):487-506.
    PMID: 32922502 DOI: 10.22037/ijpr.2019.13084.11362
    The synthesis of a novel series of bi-heterocyclic propanamides, 7a-l, was accomplished by S-substitution of 5-[(2-amino-1,3-thiazol-4-yl)methyl]-1,3,4-oxadiazol-2-thiol (3). The synthesis was initiated from ethyl 2-(2-amino-1,3-thiazol-4-yl)acetate (1) which was converted to corresponding hydrazide, 2, by hydrazine hydrate in methanol. The refluxing of hydrazide, 2, with carbon disulfide in basic medium, resulted in 5-[(2-amino-1,3-thiazol-4-yl)methyl]-1,3,4-oxadiazol-2-thiol (3). A series of electrophiles, 6a-l, was synthesized by stirring un/substituted anilines (4a-l) with 3-bromopropanoyl chloride (5) in a basic aqueous medium. Finally, the targeted compounds, 7a-l, were acquired by stirring 3 with newly synthesized electrophiles, 6a-l, in DMF using LiH as a base and an activator. The structures of these bi-heterocyclic propanamides were confirmed through spectroscopic techniques, such as IR, 1H-NMR, 13C-NMR, and EI-MS. These molecules were tested for their urease inhibitory potential, whereby, the whole series exhibited very promising activity against this enzyme. Their cytotoxic behavior was ascertained through hemolysis and it was observed that all these were less cytotoxic agents. The in-silico molecular docking analysis of these molecules was also in full agreement with their in-vitro enzyme inhibition data.
    Matched MeSH terms: Acetates
  15. Fulltext Nutritional compositions, biological activities, and phytochemical contents of the edible bamboo shoot, Dendrocalamus asper, from Malaysia
    Kong, C. K., Tan, Y. N., Chye, F. Y., Sit, N. W.
    International Food Research Journal, 2020;27(3):546-556.
    MyJurnal
    The edible shoots of Dendrocalamus asper (family Poaceae) is an underutilised food. The
    present work was conducted to evaluate the nutritional compositions, biological activities, and
    phytochemical contents of the shoots of D. asper obtained from different regions of Malaysia,
    Peninsular (DP) and East Malaysia (DS). The nutritional analysis was conducted using the
    Official Methods of Analysis of the AOAC International. All minerals were quantified using
    an inductively coupled plasma-mass spectrometer, except for potassium which was measured
    using a flame atomic absorption spectrometer. Total phenolic content (TPC) was determined
    using the Folin-Ciocalteu method. Antibacterial and antifungal activities were assayed using
    a colourimetric broth microdilution method, while antioxidant activity was tested using DPPH
    radical scavenging activity, ferric-reducing antioxidant power, and cellular antioxidant activity (CAA) assays. Enzyme inhibitory activities were examined using α-amylase and α-glucosidase. Both bamboo shoots (boiled at 100°C for 20 min) were high in moisture (> 93 g/100 g
    FW), crude protein (> 21 g/100 g DW), and crude fibre contents (> 9 g/100 g DW), but low in
    fat content (< 4 g/100 g DW). Potassium was the most abundant mineral at 205.67 and 203.83
    µg/100 g DW of bamboo shoots of DP and DS, respectively. The extracts (hexane, ethyl
    acetate, ethanol, and water) of both shoots showed stronger antifungal activity than antibacterial activity against selected human pathogens. All extracts of DP shoots demonstrated higher
    CAA in HeLa cells and α-amylase inhibitory activity than that of DS shoots. In contrast, the
    extracts of DS shoots exhibited stronger inhibition on α-glucosidase and contained higher
    TPC than that of DP shoots. The D. asper shoots obtained from the Peninsular Malaysia and
    East Malaysia contained different types of secondary metabolites which account for the differences in the biological activities. In conclusion, D. asper shoots have potential as a nutritional
    and functional food.
    Matched MeSH terms: Acetates
  16. Optimization of air-borne butyl acetate adsorption on dual-function Ag-Y adsorbent-catalyst using response surface methodology
    Bhatia S, Wong CT, Abdullah AZ
    J Hazard Mater, 2009 May 30;164(2-3):1110-7.
    PMID: 18976860 DOI: 10.1016/j.jhazmat.2008.09.040
    The low concentration and high flow rate of air-borne butyl acetate (BA) could be effectively removed using combined adsorption-catalytic oxidation system. Ag-Y (Si/Al=80) dual-function adsorbent was investigated for the adsorption step of 1000 ppm of butyl acetate at gas hourly space velocity of 13,000 h(-1) at ambient temperature under dry and humid feeds. A central composite design (CCD) coupled with response surface methodology (RSM) was employed to obtain the optimum process conditions and the interactions between process variables were demonstrated and elucidated. Humidity and increasing organic concentration shortened the adsorption service time. The effect of moisture was more pronounced at low BA concentration. The interactions between the BA concentration and humidity were statistically significant at 95% confidence level. The optimum conditions were found to be at 4500 ppm of BA with 37 min saturation time to give 58 mg BA/g as adsorption capacity. The simulated data fitted the experimental data satisfactorily. The simulated data also correctly demonstrated the overall behaviors of the adsorption process.
    Matched MeSH terms: Acetates/isolation & purification*
  17. Fulltext Optimization of headspace solid phase microextraction (HS-SPME) for the extraction of volatile organic compounds (VOCs) in MD2 pineapple
    Syaidatul Faraha Zainuddin, Siti Raihan Zakaria, Norashikin Saim, Rossuriati Dol Hamid, Rozita Osman
    Science Letters, 2020;14(2):58-70.
    MyJurnal
    Headspace solid phase microextraction (HS-SPME) was employed for the extraction of volatile organic compounds (VOCs) in MD2 pineapple (Ananas comosus L. var. comosus cv. MD2). Optimisation of HS-SPME operating parameters was conducted using three-factor, three-level Box–Behnken response surface experimental design to evaluate the interactive effects of temperature (30 – 50 ºC), extraction time (10 – 30 min) and salting effect (1 – 3 g of salt addition) on the amount of selected VOCs. Determination of VOCs was done using gas chromatography with spectrometry detector (GC-MSD). Extraction temperature was found to be significant (p < 0.05) in increasing the amount of selected VOCs (ethyl acetate, methyl isobutyrate and butanoic acid methyl ester). Based on the maximum amount of these VOCs, the optimum operating extraction conditions for HS-SPME were set up at temperature of 30 °C, time of 29 min and salt addition of 1 g. The optimized HS-SPME conditions were employed for the extraction of VOCs from pineapple of different varieties.
    Matched MeSH terms: Acetates
  18. Papaya (Carica papaya) leaf methanolic extract modulates in vitro rumen methanogenesis and rumen biohydrogenation
    Jafari S, Goh YM, Rajion MA, Jahromi MF, Ahmad YH, Ebrahimi M
    Anim Sci J, 2017 Feb;88(2):267-276.
    PMID: 27345820 DOI: 10.1111/asj.12634
    Papaya leaf methanolic extract (PLE) at concentrations of 0 (CON), 5 (LLE), 10 (MLE) and 15 (HLE) mg/250 mg dry matter (DM) with 30 mL buffered rumen fluid were incubated for 24 h to identify its effect on in vitro ruminal methanogenesis and ruminal biohydrogenation (BH). Total gas production was not affected (P > 0.05) by addition of PLE compared to the CON at 24 h of incubation. Methane (CH4 ) production (mL/250 mg DM) decreased (P 
    Matched MeSH terms: Acetates/metabolism
  19. Fulltext Performance and microbial diversity of palm oil mill effluent microbial fuel cell
    Jong BC, Liew PW, Lebai Juri M, Kim BH, Mohd Dzomir AZ, Leo KW, et al.
    Lett Appl Microbiol, 2011 Dec;53(6):660-7.
    PMID: 21967346 DOI: 10.1111/j.1472-765X.2011.03159.x
    To evaluate the bioenergy generation and the microbial community structure from palm oil mill effluent using microbial fuel cell.
    Matched MeSH terms: Acetates/metabolism
  20. Performance of Malaysian kenaf Hibiscus cannabinus callus biomass and exopolysaccharide production in a novel liquid culture
    'Aizat Norhisham D, Md Saad N, Ahmad Usuldin SR, Vayabari DAG, Ilham Z, Ibrahim MF, et al.
    Bioengineered, 2023 Dec;14(1):2262203.
    PMID: 37791464 DOI: 10.1080/21655979.2023.2262203
    The versatility of a well-known fibrous crop, Hibiscus cannabinus (kenaf) is still relatively new to many. Kenaf's potential applications, which can be extended even into critical industries such as pharmaceutical and food industries, have always been overshadowed by its traditionally grown fiber. Therefore, this study aimed to venture into the biotechnological approach in reaping the benefits of kenaf through plant cell suspension culture to maximize the production of kenaf callus biomass (KCB) and exopolysaccharide (EPS), which is deemed to be more sustainable. A growth curve was established which indicates that cultivating kenaf callus in suspension culture for 22 days gives the highest KCB (9.09 ± 1.2 g/L) and EPS (1.1 ± 0.02 g/L). Using response surface methodology (RSM), it was found that sucrose concentration, agitation speed, and naphthalene acetic acid (NAA) concentration can affect the production of KCB and EPS significantly (p 
    Matched MeSH terms: Acetates
Related Terms
Filters
Contact Us

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

External Links