https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33424 Wed 31 Oct 2018 15:06:57 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47720 Wed 25 Jan 2023 13:29:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36489 Wed 20 May 2020 15:53:17 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54878 70%) even after 10 successive adsorption-desorption cycles. Thermodynamic evaluations revealed that the adsorption process was spontaneous, endothermic, and physically driven. The nanocomposites exhibited an outstanding selective adsorption behaviour towards MB from the mixture containing MB/RhB and MB/MO with separation efficiency of 99.10% and 77.34% for CaO-ES@GO, and 61.23% and 47.81% for CaO-FB@GO respectively. The particulate interaction mechanisms within the nanocomposites primarily involved π-π interaction, hydrogen bonding, pore-filling, and electrostatic attraction. The cost analysis revealed that the developed nanocomposites are more economical for treating MB in a large-scale application. Based on the statistical analysis using response surface methodology (RSM), the contributing effects of temperature and adsorbent dosage, as well as the single effect of pH, had the most significant impact on MB removal. The nanocomposites demonstrate a promising potential for sustainable MB treatment.]]> Wed 20 Mar 2024 13:10:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44367 Wed 12 Oct 2022 10:10:29 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19404 Wed 11 Apr 2018 13:19:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25983 Wed 11 Apr 2018 12:02:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33964 Helicteres hirsuta Lour. (H. hirsuta), which has been used as a traditional medicine for malaria and diabetes treatment. Results showed that either ultrasonic temperature or sample-to-solvent ratio had a greater influence on extraction efficiency of total phenolics, flavonoids and antioxidant capacity than that of methanol concentration. Optimal extraction conditions were determined to be ultrasonic temperature of 60 °C, ultrasonic time of 25 min, ultrasonic power of 150W, sample-to-solvent ratio of 3:100 g/mL, and a solvent composition of 40% (v/v) aqueous methanol. Under these conditions, 15.97 mg GAE/g of phenolics, 16.42 mg CE/g of flavonoids, and 13.34 g/100 g of extractable solids were obtained. The highest values for DPPH, ABTS and FRAP assays were also obtained under these conditions, with the exception of CUPRAC (88% maximum value). These optimal extraction conditions can be applied to prepare powdered crude extract for further isolation and purification of individual bioactive compounds for potential use in the pharmaceutical industry.]]> Wed 09 Feb 2022 15:54:39 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47004 Tue 13 Dec 2022 11:13:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30355 Tue 03 Sep 2019 18:30:18 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37414 Thu 12 Nov 2020 17:17:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13252 Sat 24 Mar 2018 08:15:58 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21068 Sat 24 Mar 2018 07:59:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21067 Sat 24 Mar 2018 07:59:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29664 −1. Under these conditions, the aqueous extracts had the same content of TPC and TF as well as antioxidant capacity in comparison with those of methanol extracts obtained by sonication. Therefore, these conditions could be applied for further extraction and isolation of phenolic compounds from lemon pomace]]> Sat 24 Mar 2018 07:32:23 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26325 Sat 24 Mar 2018 07:24:12 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23414 Euphorbia tirucalli (E. tirucalli) has been linked with various health benefits. This study aimed to optimize ultrasonic extraction conditions for euphol from E. tirucalli leaf. Different solvents were tested to determine the most effective solvent for extraction of euphol. Then, response surface methodology (RSM) was employed to optimize ultrasound-assisted extraction conditions including temperature, time and power for maximal extraction of euphol. Our results showed that ethyl acetate:ethanol (4:1, v/v) was the most effective solvent for the extraction of euphol. Ultrasonic temperature and time had a positive impact, whereas, ultrasonic power had a negative effect on the extraction efficiency of euphol. The optimum ultrasonic extraction conditions for euphol were identified as: solvent-to-fresh sample ratio of 100:32 mL/g; ultrasonic temperature of 60 °C; ultrasonic time of 75 min and ultrasonic power of 60% (150 W). Under these optimum conditions, approximately 4.06 mg of euphol could be obtained from one gram of fresh E. tirucalli leaf. This extract also contained phenolic compounds (2.5 mg GAE/g FW) and possessed potent antioxidant capacity. These optimal conditions are applicable for a larger scale to extract and isolate euphol for potential utilization in the pharmaceutical industry. Keywords]]> Sat 24 Mar 2018 07:13:54 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52798 Mon 27 Nov 2023 10:38:31 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35378 adj) and the F-test. The results revealed that the R² proportion was greater than 0.96 for BTEX removal efficiency. The statistical analysis demonstrated that the BTEX removal efficiency was significantly correlated with the temperature, BTEX concentration, voltage, and flow rate. Voltage was the most influential variable affecting the dependent variable as it exerted a significant effect (p < 0.0001) on the response variable. According to the achieved results, NTP can be applied as a progressive, cost-effective, and practical process for treatment of airstreams polluted with BTEX in conditions of low residence time and high concentrations of pollutants.]]> Mon 22 Jul 2019 13:12:18 AEST ]]>