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  1. Fulltext A novel aqueous two phase system composed of a thermo-separating polymer and an organic solvent for purification of thermo-acidic amylase enzyme from red pitaya (Hylocereus polyrhizus) peel
    Amid M, Manap Y, Zohdi NK
    Molecules, 2014 May 22;19(5):6635-50.
    PMID: 24858097 DOI: 10.3390/molecules19056635
    The purification of thermo-acidic amylase enzyme from red pitaya (Hylocereus polyrhizus) peel for the first time was investigated using a novel aqueous two-phase system (ATPS) consisting of a thermo-separating copolymer and an organic solvent. The effectiveness of different parameters such as molecular weight of the thermo-separating ethylene oxide-propylene oxide (EOPO) copolymer and type and concentration of organic solvent on the partitioning behavior of amylase was investigated. In addition, the effects of phase components, volume ratio (VR), pH and crude load of purification factor and yield of amylase were evaluated to achieve the optimum partition conditions of the enzyme. In the novel ATPS method, the enzyme was satisfactorily partitioned into the polymer-rich top phase in the system composed of 30% (w/w) EOPO 2500 and 15% (w/w) 2-propanol, at a volume ratio of 1.94 and with a crude load scale of 25% (w/w) at pH 5.0. Recovery and recycling of components was also measured in each successive step of the ATPS process. The enzyme was successfully recovered by the method with a high purification factor of 14.3 and yield of 96.6% and copolymer was also recovered and recycled at a rate above 97%, making the method was more economical than the traditional ATPS method.
    Matched MeSH terms: 2-Propanol/chemistry
  2. Fulltext Characterization of Bovine Lactoferrin Nanoparticle Prepared by Desolvation Technique
    Taguchi K, Chuang VTG, Hashimoto M, Nakayama M, Sakuragi M, Enoki Y, et al.
    Chem Pharm Bull (Tokyo), 2020;68(8):766-772.
    PMID: 32741918 DOI: 10.1248/cpb.c20-00222
    Lactoferrin (Lf) nanoparticles have been developed as a carrier of drugs and gene. Two main methods, desolvation technique and emulsification method, for preparation of protein nanoparticles have been reported so far, but most of the previous reports of Lf nanoparticles preparation are limited to emulsification method. In this study, we investigated the optimal conditions by desolvation technique for the preparation of glutaraldehyde-crosslinked bovine Lf (bLf) nanoparticles within the size range of 100-200 nm, and evaluated their properties as a carrier for oral and intravenous drug delivery. The experimental results of dynamic light scattering and Transmission Electron Microscope suggested that glutaraldehyde-crosslinked bLf nanoparticles with 150 nm in size could be produced by addition of 2-propanol as the desolvating solvent into the bLf solution adjusted to pH 6, followed by crosslinking with glutaraldehyde. These cross-linked bLf nanoparticles were found to be compatible to blood components and resistant against rapid degradation by pepsin. Thus, cross-linked bLf nanoparticles prepared by desolvation technique can be applied as a drug carrier for intravenous administration and oral delivery.
    Matched MeSH terms: 2-Propanol/chemistry
  3. Performance of quartz crystal microbalance gas sensors using thin films of titanium dioxide, porphyrin and titanium dioxide coated with dye porphyrin
    Syariena Arshad, Salleh M, Yahaya M
    Sains Malaysiana, 2008;37:233-237.
    Titanium dioxide (TiO2), porphyrin and TiO2 coated with dye porphyrin thin films were prepared on Quartz Crystal Microbalance (QCM) using sol-gel dip coating method and were tested for sensing of volatile organic compounds (VOCs). The porphyrin used was 5,10,15,20-tetraphenyl-21H,23H-porphine manganese (III) chloride (MnTPPCl). The sensing sensitivity was based on the change in the fundamental frequency of the QCM upon exposure towards six vapor samples, namely ethanol, acetone, cyclohexane, toluene, o-xylene and 2-propanol. It was found that all the thin films were sensitive towards all the vapors. However, the TiO2 coated MnTPPCl thin film exhibit the most sensitive and has good selectivity property.
    Matched MeSH terms: 2-Propanol
  4. Fulltext Anticancer peptides derived from supermeal worm (Zophobas morio) larvae
    Yusof, F., Chowdhury, S., Faruck, M. O., Sulaiman, N.
    International Food Research Journal, 2017;24(101):0-0.
    MyJurnal
    Cancer still presents enormous challenges in the medical world. Currently, the search for
    anticancer compounds has garnered a lot of interest, especially in finding them from the natural
    sources. In this study, by using Sulforhodamine B (SRB) colorimetric assay, compounds,
    extracted from supermeal worm (Zophobas morio) larvae using two types of acidified organic
    solvent (ethanol and isopropanol), were shown to inhibit the growth of a breast cancer line,
    MCF-7. A comparative study of the effect was carried out on a normal cell line, Vero. Results
    showed that, the two types of extracts inhibits growth of MCF-7 cell at varying degrees, on
    the other hand, have much less effect on Vero cell. Extracts analysed by UV-vis spectroscopy,
    showed peaks in the range of 260 to 280 nm, inferring the presence of aromatic amino acids,
    whereas the highest peak of 3.608 AU at 230 nm indicates the presence of peptide bonds. By
    Raman spectroscopy, peaks are observed at 1349 cm-1, 944 cm-1 and 841 cm-1 indicating the
    presence of Tyr, Try and Gly, confirming the UV-vis analyses. All results of analyses implied
    that the anticancer compounds contain peptides.
    Matched MeSH terms: 2-Propanol
  5. Fulltext Room temperature radiolytic synthesized Cu@CuAlO(2)-Al(2)O(3) nanoparticles
    Abedini A, Saion E, Larki F, Zakaria A, Noroozi M, Soltani N
    Int J Mol Sci, 2012;13(9):11941-53.
    PMID: 23109893 DOI: 10.3390/ijms130911941
    Colloidal Cu@CuAlO(2)-Al(2)O(3) bimetallic nanoparticles were prepared by a gamma irradiation method in an aqueous system in the presence of polyvinyl pyrrolidone (PVP) and isopropanol respectively as a colloidal stabilizer and scavenger of hydrogen and hydroxyl radicals. The gamma irradiation was carried out in a (60)Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@CuAlO(2)-Al(2)O(3) nanoparticles was observed initially by the change in color of the colloidal samples from colorless to brown. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of bonds between polymer chains and the metal surface at all radiation doses. Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@CuAlO(2)-Al(2)O(3) nanoparticles are in a core-shell structure. By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained. The average particle diameter increased with increased precursor concentration and decreased with increased dose. This is due to the competition between nucleation, growth, and aggregation processes in the formation of nanoclusters during irradiation.
    Matched MeSH terms: 2-Propanol/chemistry
  6. Fulltext Selectivity of Copper by Amine-Based Ion Recognition Polymer Adsorbent with Different Aliphatic Amines
    Othman NAF, Selambakkannu S, Abdullah TAT, Hoshina H, Sattayaporn S, Seko N
    Polymers (Basel), 2019 Dec 02;11(12).
    PMID: 31810361 DOI: 10.3390/polym11121994
    This paper investigates the selectivity of GMA-based-non-woven fabrics adsorbent towards copper ion (Cu) functionalized with several aliphatic amines. The aliphatic amines used in this study were ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA). The non-woven polyethylene/polypropylene fabrics (NWF) were grafted with glycidyl methacrylate (GMA) via pre-radiation grafting technique, followed by chemical functionalization with the aliphatic amine. To prepare the ion recognition polymer (IRP), the functionalized amine GMA-grafted-NWF sample was subjected to radiation crosslinking process along with the crosslinking agent, divinylbenzene (DVB), in the presence of Cu ion as a template in the matrix of the adsorbent. Functionalization with different aliphatic amine was carried out at different amine concentrations, grafting yield, reaction temperature, and reaction time to study the effect of different aliphatic amine onto amine density yield. At a concentration of 50% of amine and 50% of isopropanol, EDA, DETA, TETA, and TEPA had attained amine density around 5.12, 4.06, 3.04, and 2.56 mmol/g-ad, respectively. The amine density yield decreases further as the aliphatic amine chain grows longer. The experimental condition for amine functionalization process was fixed at 70% amine, 30% isopropanol, 60 °C for grafting temperature, and 2 h of grafting time for attaining 100% of grafting yield (Dg). The prepared adsorbents were characterized comprehensively in terms of structural and morphology with multiple analytical tools. An adsorptive removal and selectivity of Cu ion by the prepared adsorbent was investigated in a binary metal ion system. The IRP samples with a functional precursor of EDA, the smallest aliphatic amine had given the higher adsorption capacity and selectivity towards Cu ion. The selectivity of IRP samples reduces as the aliphatic amine chain grows longer, EDA to TEPA. However, IRP samples still exhibited remarkably higher selectivity in comparison to the amine immobilized GMA-g-NWF at similar adsorption experimental conditions. This observation indicates that IRP samples possess higher selectivity after incorporation of the ion recognition imprint technique via the radiation crosslinking process.
    Matched MeSH terms: 2-Propanol
  7. Fulltext Biocompatibility and Cytotoxicity Study of Polydimethylsiloxane (PDMS) and Palm Oil Fuel Ash (POFA) Sustainable Super-Hydrophobic Coating for Biomedical Applications
    Sreekantan S, Hassan M, Sundera Murthe S, Seeni A
    Polymers (Basel), 2020 Dec 18;12(12).
    PMID: 33352856 DOI: 10.3390/polym12123034
    A sustainable super-hydrophobic coating composed of silica from palm oil fuel ash (POFA) and polydimethylsiloxane (PDMS) was synthesised using isopropanol as a solvent and coated on a glass substrate. FESEM and AFM analyses were conducted to study the surface morphology of the coating. The super-hydrophobicity of the material was validated through goniometry, which showed a water contact angle of 151°. Cytotoxicity studies were conducted by assessing the cell viability and cell morphology of mouse fibroblast cell line (L929) and hamster lung fibroblast cell line (V79) via tetrazolium salt 3-(4-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and microscopic methods, respectively. The clonogenic assay was performed on cell line V79 and the cell proliferation assay was performed on cell line L929. Both results validate that the toxicity of PDMS: SS coatings is dependent on the concentration of the super-hydrophobic coating. The results also indicate that concentrations above 12.5 mg/mL invariably leads to cell toxicity. These results conclusively support the possible utilisation of the synthesised super-hydrophobic coating for biomedical applications.
    Matched MeSH terms: 2-Propanol
  8. Studies on the kinetics of Isopropyl Palmitate synthesis in packed bed bioreactor using immobilized lipase
    Kee CY, Hassan M, Ramachandran KB
    Artif Cells Blood Substit Immobil Biotechnol, 1999 Sep-Nov;27(5-6):393-8.
    PMID: 10595438
    The objective of this research was to study the kinetics of synthesis of a commercially important ester - Isopropyl Palmitate (IPP) using immobilized lipase (Lipozyme IM). It was studied in a packed bed differential reactor. In order to establish the kinetics of the reaction, parameters such as linear velocity of the fluid through the reactor, particle size, substrate concentration, substrate molar ratio, temperature and water activity were studied. Operational and storage stability of the enzyme were also assessed. The reaction followed Michaelis-Menton kinetics as observed from the relationship of initial rate of the reaction as a function of substrate concentration. It was found that the optimum substrate concentration was 0.15M palmitic acid and isopropyl alcohol in 1:1 stoichiometric ratio. Inhibition by excess of isopropyl alcohol has been identified. The optimum temperature for the esterification reaction was found to be around 50 degrees C. The activation energy of this process was determined to be 43.67 kJ/mol. The optimum water content was 0.50%. The reaction rates were measured in the absence of any significant external diffusional limitations. Since internal diffusional limitations could not be eliminated, the kinetics observed is only apparent.
    Matched MeSH terms: 2-Propanol/metabolism
  9. Fulltext Hierarchical Bimetallic AgPt Nanoferns as High-Performance Catalysts for Selective Acetone Hydrogenation to Isopropanol
    Mawarnis ER, Ali Umar A, Tomitori M, Balouch A, Nurdin M, Muzakkar MZ, et al.
    ACS Omega, 2018 Sep 30;3(9):11526-11536.
    PMID: 31459253 DOI: 10.1021/acsomega.8b01268
    A combinative effect of two or more individual material properties, such as lattice parameters and chemical properties, has been well-known to generate novel nanomaterials with special crystal growth behavior and physico-chemical performance. This paper reports unusually high catalytic performance of AgPt nanoferns in the hydrogenation reaction of acetone conversion to isopropanol, which is several orders higher compared to the performance shown by pristine Pt nanocatalysts or other metals and metal-metal oxide hybrid catalyst systems. It has been demonstrated that the combinative effect during the bimetallisation of Ag and Pt produced nanostructures with a highly anisotropic morphology, i.e., hierarchical nanofern structures, which provide high-density active sites on the catalyst surface for an efficient catalytic reaction. The extent of the effect of structural growth on the catalytic performance of hierarchical AgPt nanoferns is discussed.
    Matched MeSH terms: 2-Propanol
  10. Sustainable approach in phlorotannin recovery from macroalgae
    Chia SR, Show PL, Phang SM, Ling TC, Ong HC
    J Biosci Bioeng, 2018 Aug;126(2):220-225.
    PMID: 29673988 DOI: 10.1016/j.jbiosc.2018.02.015
    In this present study, alcohol/salt liquid biphasic system was used to extract phlorotannin from brown macroalgae. Liquid biphasic system is a new green technology that integrated with various processes into one-step, by concentrating, separating and purifying the bioproduct in a unit operation. The solvent used is non-toxic and there is potential for solvent recovery which is beneficial to the environment. Phlorotannin is a bioactive compound that has gained much attention due to its health beneficial effect. Therefore, the isolation of phlorotannin is lucrative as it contains various biological activities that are capable to be utilised into food and pharmaceutical application. By using 2-propanol/ammonium sulphate system, the highest recovery of phlorotannin was 76.1% and 91.67% with purification factor of 2.49 and 1.59 from Padina australis and Sargassum binderi, respectively. A recycling study was performed and the salt phase of system was recycled where maximum salt recovery of 41.04% and 72.39% could be obtained from systems containing P. australis and S. binderi, respectively. Similar recovery of phlorotannin was observed after performing two cycles of the system, this concludes that the system has good recyclability and eco-friendly.
    Matched MeSH terms: 2-Propanol/metabolism
  11. Fulltext One-Dimensional-Like Titania/4'-Pentyl-4-Biphenylcarbonitrile Composite Synthesized Under Magnetic Field and its Structure-Photocatalytic Activity Relationship
    Abu Bakar NI, Chandren S, Attan N, Leaw WL, Nur H
    Front Chem, 2018;6:370.
    PMID: 30255010 DOI: 10.3389/fchem.2018.00370
    The demonstration of the structure-properties relationship of shape-dependent photocatalysts remains a challenge today. Herein, one-dimensional (1-D)-like titania (TiO2), as a model photocatalyst, has been synthesized under a strong magnetic field in the presence of a magnetically responsive liquid crystal as the structure-aligning agent to demonstrate the relationship between a well-aligned structure and its photocatalytic properties. The importance of the 1-D-like TiO2 and its relationship with the electronic structures that affect the electron-hole recombination and the photocatalytic activity need to be clarified. The synthesis of 1-D-like TiO2 with liquid crystal as the structure-aligning agent was carried out using the sol-gel method under a magnetic field (0.3 T). The mixture of liquid crystal, 4'-pentyl-4-biphenylcarbonitrile (5CB), tetra-n-butyl orthotitanate (TBOT), 2-propanol, and water, was subjected to slow hydrolysis under a magnetic field. The TiO2-5CB took a well-aligned whiskerlike shape when the reaction mixture was placed under the magnetic field, while irregularly shaped TiO2-5CB particles were formed when no magnetic field was applied. It shows that the strong interaction between 5CB and TBOT during the hydrolysis process under a magnetic field controls the shape of titania. The intensity of the emission peaks in the photoluminescence spectrum of 1-D-like TiO2-5CB was lowered compared with the TiO2-5CB synthesized without the magnetic field, suggesting the occurrence of electron transfer from 5CB to the 1-D-like TiO2-5CB during ultraviolet irradiation. Apart from that, direct current electrical conductivity and Hall effect studies showed that the 1-D-like TiO2 composite enhanced electron mobility. Thus, the recombination of electrons and holes was delayed due to the increase in electron mobility; hence, the photocatalytic activity of the 1-D-like TiO2 composite in the oxidation of styrene in the presence of aqueous hydrogen peroxide under UV irradiation was enhanced. This suggests that the 1-D-like shape of TiO2 composite plays an important role in its photocatalytic activity.
    Matched MeSH terms: 2-Propanol
  12. Fulltext Impact of parameter variation in fabrication of nanostructure by atomic force microscopy nanolithography
    Dehzangi A, Larki F, Hutagalung SD, Goodarz Naseri M, Majlis BY, Navasery M, et al.
    PLoS One, 2013;8(6):e65409.
    PMID: 23776479 DOI: 10.1371/journal.pone.0065409
    In this letter, we investigate the fabrication of Silicon nanostructure patterned on lightly doped (10(15) cm(-3)) p-type silicon-on-insulator by atomic force microscope nanolithography technique. The local anodic oxidation followed by two wet etching steps, potassium hydroxide etching for silicon removal and hydrofluoric etching for oxide removal, are implemented to reach the structures. The impact of contributing parameters in oxidation such as tip materials, applying voltage on the tip, relative humidity and exposure time are studied. The effect of the etchant concentration (10% to 30% wt) of potassium hydroxide and its mixture with isopropyl alcohol (10%vol. IPA ) at different temperatures on silicon surface are expressed. For different KOH concentrations, the effect of etching with the IPA admixture and the effect of the immersing time in the etching process on the structure are investigated. The etching processes are accurately optimized by 30%wt. KOH +10%vol. IPA in appropriate time, temperature, and humidity.
    Matched MeSH terms: 2-Propanol/chemistry
  13. Knowledge, attitude, and practices of operating theatre staff towards environmentally sustainable practices in the operating theatres
    Lim BLS, Narayanan V, Nah SA
    Pediatr Surg Int, 2023 Mar 17;39(1):152.
    PMID: 36930355 DOI: 10.1007/s00383-023-05400-6
    BACKGROUND: Successful implementation of environmentally sustainable practices in the operating theatre (OT) requires stakeholder engagement. We evaluate the knowledge, attitudes, and practices of OT users in our institution towards sustainable practices in the OT.

    METHODS: A survey was conducted among OT users in August 2022. Respondents completed a 44-question anonymised online survey covering sustainability in (1) knowledge, (2) attitude, (3) practice, and (4) proposed changes to current practices. Points were assigned to knowledge (15 points) and attitude (40 points) sections. Practice was evaluated based on proportion of measures practiced. Appropriate statistical tests were used, with significance p 

    Matched MeSH terms: 2-Propanol
  14. Fulltext Size-controlled and optical properties of monodispersed silver nanoparticles synthesized by the radiolytic reduction method
    Saion E, Gharibshahi E, Naghavi K
    Int J Mol Sci, 2013;14(4):7880-96.
    PMID: 23579953 DOI: 10.3390/ijms14047880
    Size-controlled and monodispersed silver nanoparticles were synthesized from an aqueous solution containing silver nitrate as a metal precursor, polyvinyl alcohol as a capping agent, isopropyl alcohol as hydrogen and hydroxyl radical scavengers, and deionized water as a solvent with a simple radiolytic method. The average particle size decreased with an increase in dose due to the domination of nucleation over ion association in the formation of the nanoparticles by gamma reduction. The silver nanoparticles exhibit a very sharp and strong absorption spectrum with the absorption maximum λmax blue shifting with an increased dose, owing to a decrease in particle size. The absorption spectra of silver nanoparticles of various particle sizes were also calculated using a quantum physics treatment and an agreement was obtained with the experimental absorption data. The results suggest that the absorption spectrum of silver nanoparticles possibly derived from the intra-band excitations of conduction electrons from the lowest energy state (n = 5, l = 0) to higher energy states (n ≥ 6; Δl = 0, ±1; Δs = 0, ±1), allowed by the quantum numbers principle. This demonstrates that the absorption phenomenon of metal nanoparticles based on a quantum physics description could be exploited to be added into the fundamentals of metal nanoparticles and the related fields of nanoscience and nanotechnology.
    Matched MeSH terms: 2-Propanol/chemistry
  15. 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.
    Matched MeSH terms: 2-Propanol
  16. Fulltext Determination of ethanol, isopropyl alcohol and methanol in alcohol-based hand sanitiser to ensure product quality, safety and efficacy
    Nisbar ND, Jamal Khair SK, Bujang NB, Mohd Yusop AY
    Sci Rep, 2023 Jun 10;13(1):9478.
    PMID: 37301842 DOI: 10.1038/s41598-023-36283-1
    The Coronavirus Disease-2019 (COVID-19) outbreak is an unprecedented global pandemic, sparking grave public health emergencies. One of the measures to reduce COVID-19 transmissions recommended by the World Health Organization is hand hygiene, i.e., washing hands with soap and water or disinfecting them using an alcohol-based hand sanitiser (ABHS). Unfortunately, competing ABHSs with unknown quality, safety, and efficacy thrived, posing yet another risk to consumers. This study aims to develop, optimise, and validate a gas chromatography-mass spectrometry (GC-MS)-based analytical method to simultaneously identify and quantify ethanol or isopropyl alcohol as the active ingredient in ABHS, with simultaneous determination of methanol as an impurity. The GC-MS was operated in Electron Ionisation mode, and Selected Ion Monitoring was chosen as the data acquisition method for quantitation. The analytical method was validated for liquid and gel ABHSs, covering the specificity, linearity and range, accuracy, and precisions, including the limit of detection and the limit of quantitation. The specificity of each target analyte was established using the optimised chromatographic separation with unique quantifier and qualifier ions. The linearity was ascertained with a coefficient of determination (r2) of > 0.9994 over the corresponding specification range. Respectively, the accuracy and precisions were satisfactory within 98.99 to 101.09% and 
    Matched MeSH terms: 2-Propanol
  17. Sintesis nanozarah kuprum dalam larutan kitosan menggunakan kaedah sinaran gama
    Shahrul Izwan B. Armad, Shahidan B. Radiman, Md. Soot B. Ahmad
    Sains Malaysiana, 2014;43:1751-1759.
    Kesan penggunaan kitosan terhadap nanozarah kuprum (Cu) yang disintesis menggunakan sinaran gama sebagai sumber agen penurunan telah dijalankan dalam sistem akues. Dos sinaran terserap yang digunakan adalah 50 kGy manakala penambahan isopropanol adalah penting sebagai penggarut kepada radikal pengoksidaan serta meningkatkan peranan agen penurun yang terhasil daripada proses radiolisis. Analisis serapan optik-uv telah mencirikan sifat optik larutan nanozarah Cu yang disintesis. Ketulenan fasa kristal nanozarah Cu yang terbentuk dalam matrix kitosan telah dibuktikan dengan pembelauan sinar-X (xRD). Berdasarkan imej mikroskop imbasan elektron (TEM), nanozarah Cu yang terhasil adalah berbentuk sfera dengan julat saiz 6-10 nm kecuali nanozarah Cu yang disintesis dalam kepekatan kitosan 03% wlv yang menunjukkan taburan bentuk yang tidak sekata. Analisis spektrofotometer transformasi Fourier inframerah (FHR) yang dijalankan telah mengesahkan kehadiran sebatian kitosan dalam sampel nanozarah Cu dengan kepekatan kitosan 0.1 dan 0.3% wlv. Kajian ini mendapati penggunaan kitosan dapat melindungi nanozarah Cu daripada pengoksidaan oleh persekitaran. Saiz nanozarah juga didapati meningkat seiring dengan peningkatan kepekatan kitosan yang digunakan.
    Matched MeSH terms: 2-Propanol
  18. Proteins recovery from wet microalgae using liquid biphasic flotation (LBF)
    Phong WN, Show PL, Teh WH, Teh TX, Lim HMY, Nazri NSB, et al.
    Bioresour Technol, 2017 Nov;244(Pt 2):1329-1336.
    PMID: 28602664 DOI: 10.1016/j.biortech.2017.05.165
    In this work, the extraction of microalgal protein from wet Chlorella sorokiniana species using alcohol/salt liquid biphasic flotation (LBF) with the aid of ultrasonication for cell rupturing was proposed. The effect of varying crude feedstock concentration, flotation time, salt type, salt concentration, alcohol type, alcohol concentration, initial volumes of salt and alcohol were investigated. After the optimization process, the highest proportion of protein recovered in the top phase was achieved with 250g/L ammonium sulphate, 60% (v/v) 2-propanol, 1.0VR,initial, 20g/L crude biomass load, 4mm3/min air flowrate and 10min of flotation time. The recycling of phase components was introduced to minimize the use of alcohol and salt in the corresponding LBF. It was demonstrated that top phase (alcohol) recycling can achieve increasing performance for three consecutive recycling runs. Under optimized process conditions, the proportion of protein recovered in the top phase was 88.86% for the third recycle run.
    Matched MeSH terms: 2-Propanol
  19. Partition efficiency of cytochrome c with alcohol/salt aqueous biphasic flotation system
    Ng HS, Ng TC, Kee PE, Tan JS, Yim HS, Lan JC
    J Biosci Bioeng, 2020 Feb;129(2):237-241.
    PMID: 31629635 DOI: 10.1016/j.jbiosc.2019.08.013
    Aqueous biphasic flotation (ABF) integrates aqueous biphasic system (ABS) and solvent sublation for recovery of target biomolecules. The feasibility of the alcohol/salt ABF for exclusive partition of cytochrome c to one specific phase of the system was investigated. Aliphatic alcohols of different carbon chain length (ethanol, 1-propanol and 2-propanol) and salts (sulfate, phosphate and citrate) were used for the phase formation. The effects of phase composition, concentration of sample loading, pH, flotation time and flow rate of the system on the partition efficiency of cytochrome c were determined. Cytochrome c was exclusively partitioned to the alcohol-rich top phase of the ABF of 18% (w/w) ethanol and 26% (w/w) ammonium sulfate with pH 6 and 20% (w/w) of sample loading. Highest partition coefficient (K) of 6.85 ± 0.21 and yield (YT) of 99.40% ± 0.02 were obtained with optimum flotation rate of 10 mL/min and flow rate of 10 min.
    Matched MeSH terms: 2-Propanol/chemistry
  20. Fulltext Preliminary screening of endophytic fungi from medicinal plants in malaysia for antimicrobial and antitumor activity
    Radu S, Kqueen CY
    Malays J Med Sci, 2002 Jul;9(2):23-33.
    PMID: 22844221 MyJurnal
    The screening of antimicrobial activity against Gram-positive bacteria, Gram-negative bacteria, yeast and fungi was carried out on isopropanol extracts prepared from 121 isolates of endophytic fungi isolated from medicinal plants in Malaysia. Sensitivity was found to vary among the microorganisms. Bacillus subtilis, Saccharomyces cerevisiae and Alternaria sp. were susceptible to extracts from three, two and two isolates of endophytic fungi, respectively. None were found effective against Salmonella typhimurium. Sixteen endophytic fungal isolates tested were also found to exhibit antitumor activity in the yeast cell-based assay.
    Matched MeSH terms: 2-Propanol
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