Zulkifli, Seri Elyanie and Hamzah, Mohd Amir Asyraf Mohd and Yahayu, Maizatulakmal and Abd Aziz, Astimar and Hashim, Najihah Mohd and Zakaria, Zainul Akmar (2023) Optimisation of microwave-assisted production of acid condensate from palm kernel shell and its biological activities. Biomass Conversion and Biorefinery, 13 (12). pp. 10387-10397. ISSN 2190-6815, DOI https://doi.org/10.1007/s13399-021-01631-6.
Full text not available from this repository.Abstract
This study reports on the microwave-assisted heating optimisation of acid condensate (AC) from palm kernel shell (PKS), using the central composite design (CCD) approach focusing on its total phenolic content (TPC) as response and its antimicrobial activity. Thermogravimetric-derivative thermogravimetric (TG-DTG) analysis clearly depicted the devolatilisation of lignocellulosic content of PKS. The highest TPC in concentrated AC extract (CACE), 451.51 +/- 2.37 mu g GAE/mg (R-2 0.9870), was obtained at microwave power of 580 W, nitrogen flow rate of 2.4 L/min and final temperature of 480 oC. Nitrogen flow rate had the highest effect on TPC with an F value of 63.65. Relative to ascorbic acid, CACE showed a higher Trolox equivalent antioxidant capacity (TEAC) but almost similar 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capabilities which can be attributed to the presence of 1,2-benzendiol, i.e. catechol (27.82%) and 1,3-dimethoxy-2-hydroxybenzene, i.e. syringol (22.76%). CACE also displayed good potential for antimicrobial application with high growth inhibition of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, Aspergillus niger and Fusarium oxysporum. In conclusion, PKS has a great potential to be used as raw material to produce AC (acid condensate) using microwave-assisted heating process.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education, Malaysia (Q.J130000.2451.07G78), Graduate Research Assistantship |
| Uncontrolled Keywords: | Palm kernel shell; Acid condensate; Optimisation; Antioxidant; Antimicrobial |
| Subjects: | R Medicine > RM Therapeutics. Pharmacology R Medicine > RS Pharmacy and materia medica T Technology > TP Chemical technology |
| Divisions: | Faculty of Pharmacy > Department of Pharmaceutical Chemistry |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 24 Oct 2025 08:03 |
| Last Modified: | 24 Oct 2025 08:03 |
| URI: | http://eprints.um.edu.my/id/eprint/50064 |
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