Malaysian Journal of Analytical Sciences最新文献_第10页

ALGINATE AEROGELS DRIED BY SUPERCRITICAL CO2 AS HERBAL DELIVERY CARRIER 海藻酸盐气凝胶经超临界co2干燥，作为草药输送载体

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-21

{"title":"ALGINATE AEROGELS DRIED BY SUPERCRITICAL CO2 AS HERBAL DELIVERY CARRIER","authors":"","doi":"10.17576/mjas-2018-2203-21","DOIUrl":"https://doi.org/10.17576/mjas-2018-2203-21","url":null,"abstract":"Herbal medicinal plant have been recognized as alternative and natural drugs for therapeutic purposes due to their high content of phytocompounds with anti-bacterial, antioxidant and anti-inflammatory properties. Low solubility and poor absorption of medicinal compounds are seen as major challenges for herbal drugs. Impregnation of these substances into aerogels as a carrier is an innovative to improve poorly soluble compounds. In this work, alginate hydrogels were produced via sol-gel processing method and dried by supercritical CO2 drying to obtain high porous structure of alginate aerogels. Alginate is a type of polysaccharides that is widely applied in biomedical, pharmaceuticals, cosmetics, and foods due to its nontoxic, stability and versatility properties. Plant extracts of Clinacanthus nutans Lindau (C. nutans) were impregnated into the alginate aerogels via liquid media followed by supercritical drying and via supercritical CO2 assisted impregnation technique. Results exhibited that the initial concentration of polyphenols of the C.nutans extracts impregnated in the alginate aerogels is stable in the range of 0.796 to 0.745 mg/g in 6 month and drastically reduced after 9 month of storage duration. The herbal extract type C.nutans-100 loaded via supercritical CO2 impregnation has a comparable specific loading to the method of liquid media, range from 1.4 to 1.5 × 10 g/m whereas the specific loading of C.nutans-50 extract impregnated via liquid media showed higher compared with the loading by method of supercritical CO2.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67646684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

ROOM TEMPERATURE SYNTHESIS OF CERIA BY THE ASSISTED OF CATIONIC SURFACTANT AND AGING TIME 用阳离子表面活性剂和时效时间辅助室温合成氧化铈

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-05

Nor Aqilah Mohd Fadzil, M. Rahim, G. P. Maniam

{"title":"ROOM TEMPERATURE SYNTHESIS OF CERIA BY THE ASSISTED OF CATIONIC SURFACTANT AND AGING TIME","authors":"Nor Aqilah Mohd Fadzil, M. Rahim, G. P. Maniam","doi":"10.17576/mjas-2018-2203-05","DOIUrl":"https://doi.org/10.17576/mjas-2018-2203-05","url":null,"abstract":"This paper presents the synthesis of rare earth cerium(IV) oxide (ceria) via simple precipitation method under room temperature. The two aims of this research are to: (i) synthesise a ceria-based material using simple process and chemicals and (ii) modify the ceria-based material with environmentally friendly elements. In this study, cerium nitrate hexahydrate and sodium hydroxide were utilised as the precursor and precipitant, respectively, to attain desired crystallite size and shape, at a fixed reaction pH of 12. Besides that, common cationic surfactant, cetyl-tri-methyl-ammonium bromide (CTAB), was used to enhance ceria-based material’s coveted properties. Furthermore, addition of surfactant and aging time (30 minutes, and 5, 10, 20, and 30 days) were also examined. Findings showed that as aging time increased, crystallite size decreased and production of large agglomerations were not observed. Then, optimum aging time was applied for synthesis of ceria material and modified ceria material, FeCeO2/TiO2, via impregnation method. These materials were subjected to X-ray diffraction (XRD), CO2-TemperatureProgrammed Desorption (CO2-TPD), and Field Emission Scanning Electron Microscopy (FESEM) to investigate the mutual effect of surfactant addition and aging time.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67647028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

SYNTHESIZED AND CHARACTERIZATION OF SODIUM COBALT OXIDE AS SODIUM-ION CATHODE BATTERIES USING SOL-GEL METHOD 溶胶-凝胶法制备钠离子阴极电池用氧化钴钠及其性能

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-13

S.-L. Jan, Nur Adriana Hasya Mohd Azhar, M. Jani

引用次数: 3

VARIATION OF PM10 AND HEAVY METALS CONCENTRATION OF SUB-URBAN AREA CAUSED BY HAZE EPISODE 雾霾引起亚城市PM10和重金属浓度的变化

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-19

Mohd Zahari Abdullah, N. A. Alias

{"title":"VARIATION OF PM10 AND HEAVY METALS CONCENTRATION OF SUB-URBAN AREA CAUSED BY HAZE EPISODE","authors":"Mohd Zahari Abdullah, N. A. Alias","doi":"10.17576/mjas-2018-2203-19","DOIUrl":"https://doi.org/10.17576/mjas-2018-2203-19","url":null,"abstract":"A severe haze episode has swept across Malaysia in late June until October 2015 and has caused sharp rises of Air Pollution Index (API) across the country. This study was conducted to evaluate the effects of haze event on the API sub-indices during 10 days of the sampling period. The air particulate samples (PM10) were collected at an open site in UiTM Jengka, Pahang by using high volume air sampler (HVAS). The standard acid digestion method was applied to dissolve the sample and the concentrations of heavy metals were analyzed by inductively coupled plasma – optical emission spectrometry (ICP–OES). The API sub-indices were calculated based on the standard method applied by Department of Environment (DOE) Malaysia. The results showed significant differences in PM10 mass between haze and non-haze days, which were ranged between 28.4 μg/m 3 to 132.9 μg/m and 17.3 μg/m to 34.7 μg/m for the respective two sampling intervals, haze and non-haze days. The mass concentrations of the studied metals did not show any significant different between the two intervals which indicates other constituent of particulate has contributed to the different weight of PM10. The highest API sub-indices during haze days was recorded as 89 which is classified as moderate level of air pollution. The overall results clearly showed that haze event has increased the PM10 mass of the surrounding air but not the concentration of heavy metals.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41519218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

AN ENVIRONMENTALLY FRIENDLY METHOD FOR EXTRACTION OF PARABENS IN VARIOUS SAMPLES USING LOW VISCOSITY AND LOW CLOUD POINT TEMPERATURE SURFACTANT 低粘度低浊点温度表面活性剂萃取不同样品中对羟基苯甲酸酯的环保方法

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-01

Norseyrihan Mohd Sohaimi, N. Saleh, M. Ariffin, S. Y. Beh, R. Ahmad

引用次数: 4

ELECTROCHEMICAL PROPERTIES OF POLYMER ELECTROLYTES TREATED WITH 6PPD ON 30% POLY(METHYL METHACRYLATE) GRAFTED NATURAL RUBBER 30%聚甲基丙烯酸甲酯接枝天然橡胶经6ppd处理后聚合物电解质的电化学性能

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-17

引用次数: 5

RAPID SYNTHESIS AND CHARACTERIZATION OF LEAF-LIKE ZEOLITIC IMIDAZOLATE FRAMEWORK 类叶沸石咪唑酸酯骨架的快速合成与表征

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-24

引用次数: 1

FABRICATION AND CHARACTERIZATION OF RUBY NANOPARTICLES 纳米红宝石的制备与表征

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-12

W. Razali, A. Kasim, S. A. Senawi, A. Hashim, N. Yahya, H. A. Rafaie

引用次数: 3

QUANTIFICATION OF GROUNDWATER-DERIVED NUTRIENTS INTO BEACH RIDGE DRAINAGE USING RADON MASS BALANCE MODEL 利用氡质量平衡模型定量分析滩脊排水中的地下水营养物

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-06

Nicholas Chia Wei Ng, S. Poh

引用次数: 0

A-NOR STEROIDS FROM THE MARINE SPONGE, Clathria SPECIES 从海洋海绵中提取的类固醇，克拉西亚物种

Malaysian Journal of Analytical Sciences Pub Date : 2018-06-25 DOI: 10.17576/mjas-2018-2203-02

I. Sahidin, C. W. Sabandar, Wahyuni, Rini Hamsidi, M. Malaka, B. Sadarun, La Ode Aslan

引用次数: 6