1
|
Semail NF, Keyon ASA, Saad B, Kamaruzaman S, Zain NNM, Lim V, Miskam M, Abdullah WNW, Raoov M, Yahaya N. Induced sample via transient isotachophoresis mediated with sweeping in micellar electrokinetic chromatography for the dual-stacking strategy of non-steroidal anti-inflammatory drugs in environmental water samples. J Chromatogr A 2022; 1685:463616. [DOI: 10.1016/j.chroma.2022.463616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 10/10/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022]
|
2
|
Ahmad AF, Zulkurnain N, Rosid SJM, Azid A, Endut A, Toemen S, Ismail S, Abdullah WNW, Aziz SM, Yusoff NM, Rosid SM, Nasir NA. Catalytic Transesterification of Coconut Oil in Biodiesel Production: A Review. Catal Surv Asia 2022. [DOI: 10.1007/s10563-022-09358-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
Nazmi NASM, Razak FIA, Mokhtar WNAW, Ibrahim MNM, Adam F, Yahaya N, Rosid SJM, Shukri NM, Abdullah WNW. Catalytic oxidative desulfurisation over Co/Fe-γAl 2O 3 catalyst: performance, characterisation and computational study. Environ Sci Pollut Res Int 2022; 29:1009-1020. [PMID: 34341936 DOI: 10.1007/s11356-021-15733-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 07/25/2021] [Indexed: 06/13/2023]
Abstract
The world faces the challenge to produce ultra-low sulfur diesel with low-cost technology. Therefore, this research emphasised on production of low sulfur fuel utilising nanoparticle catalyst under mild condition. A small amount of cobalt oxide (10-30 wt%) was introduced into the Fe/Al2O3 catalyst through the wet impregnation method. Cobalt modification induces a positive effect on the performance of the iron catalyst. Hence, the insertion of cobalt species into Fe/Al2O3 led to the formation of lattice fringes in all directions which resulted in the formation of Co3O4 and Fe3O4 species. The optimised catalyst, Co/Fe-Al2O3, calcined at 400 °C with a dopant ratio of 10:90 indicating the highest desulfurisation activity by removing 96% of thiophene, 100% of dibenzothiophene (DBT) and 92% of 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Based on the density functional theory (DFT) on Co/Fe-Al2O3, two pathways with the overall energy of -40.78 eV were suggested for the complete oxidation of DBT.
Collapse
Affiliation(s)
| | - Fazira Ilyana Abdul Razak
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor, Malaysia
| | - Wan Nur Aini Wan Mokhtar
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia
| | | | - Farook Adam
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Minden, Pulau Pinang, Malaysia
| | - NoorFatimah Yahaya
- Integrative Medicine Cluster, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, 13200 Bertam Kepala Batas, Penang, Malaysia
| | - Salmiah Jamal Mat Rosid
- Unisza Science and Medicine Foundation Centre, Universiti Sultan Zainal Abidin, Besut Campus, 22200, Besut, Terengganu, Malaysia
| | - Nurasmat Mohd Shukri
- School of Health Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
| | | |
Collapse
|
4
|
Semail NF, Abdul Keyon AS, Saad B, Kamaruzaman S, Mohamad Zain NN, Lim V, Miskam M, Wan Abdullah WN, Yahaya N, Chen DDY. Simultaneous preconcentration and determination of sulfonamide antibiotics in milk and yoghurt by dynamic pH junction focusing coupled with capillary electrophoresis. Talanta 2022; 236:122833. [PMID: 34635223 DOI: 10.1016/j.talanta.2021.122833] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/27/2021] [Accepted: 08/28/2021] [Indexed: 10/20/2022]
Abstract
A dynamic pH junction was used in capillary electrophoresis (CE-DAD) to on-line preconcentrate, separate, and determine trace amounts of sulfonamide antibiotics (SAs) in milk and yoghurt samples in this study. A sample matrix with 0.15% acetic acid and 10% methanol (MeOH) at a pH of 4.0, and a background electrolyte (BGE) that contained 35 mM sodium citrate with 10% MeOH at a pH of 8.5, and an acidic barrage of 0.4% acetic acid with 10% MeOH at a pH of 2.5 were utilised to achieve a stacking effect for SAs through a dynamic pH junction. Under optimised conditions, the proposed preconcentration method showed good linearity (30-500 ng/mL, r2 ≥ 0.9940), low limits of detection (LODs) of 4.1-6.3 ng/mL, and acceptable analytes recovery (81.2-106.9%) with relative standard deviations (RSDs) within 5.3-13.7 (n = 9). The limits of quantification (LOQs) were below the maximum residue limit approved by the European Union (EU) in this type of matrices. Sensitivity enhancement factors of up to 129 were reached with the optimised dynamic pH junction using CE with a diode array detector (DAD). The method was used to determine SAs in fresh milk, low-fat milk, full-cream milk, and yoghurt samples.
Collapse
Affiliation(s)
- Nadhiratul-Farihin Semail
- Integrative Medicine Clusters, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Bertam, 13200, Kepala Batas, Penang, Malaysia
| | - Aemi Syazwani Abdul Keyon
- Department of Chemistry, Faculty of Science and Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310, UTM, Johor Bahru, Johor, Malaysia
| | - Bahruddin Saad
- Fundamental & Applied Sciences Department, Universiti Teknologi PETRONAS, 32601, Seri Iskandar, Perak Darul Ridzuan, Malaysia
| | - Sazlinda Kamaruzaman
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - Nur Nadhirah Mohamad Zain
- Integrative Medicine Clusters, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Bertam, 13200, Kepala Batas, Penang, Malaysia
| | - Vuanghao Lim
- Integrative Medicine Clusters, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Bertam, 13200, Kepala Batas, Penang, Malaysia
| | - Mazidatulakmam Miskam
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, USM Pulau Pinang, Malaysia
| | | | - Noorfatimah Yahaya
- Integrative Medicine Clusters, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Bertam, 13200, Kepala Batas, Penang, Malaysia.
| | - David D Y Chen
- Department of Chemistry, University of British Columbia, Vancouver, V6T 1Z1, Canada.
| |
Collapse
|
7
|
Abdullah WNW, Bakar WAWA, Ali R. Catalytic oxidative desulfurization of diesel fuel utilizing a polymolybdate alumina supported catalyst: characterization, catalytic activity and mechanistic study. Reac Kinet Mech Cat 2014. [DOI: 10.1007/s11144-014-0801-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|