https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22361 Wed 11 Apr 2018 15:08:31 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12147 Wed 11 Apr 2018 14:02:16 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:22008 Wed 11 Apr 2018 11:50:13 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55543 Wed 05 Jun 2024 09:36:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33080 −1, respectively. The carotenoid extraction yield and the antioxidant capacity extraction yield were 271 mg/100 g DW and 737 μm TE/100 g DW, respectively. Thus, the extraction using ethyl acetate with the ratio of 80:1 (mL solvent per g Gac peel) for 150 min at 40.7°C is suggested for recovering carotenoids and antioxidant capacity from Gac peel.]]> Wed 04 Sep 2019 09:54:30 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49754 Tue 30 May 2023 17:28:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48949 Tue 18 Apr 2023 11:15:59 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44335 Tue 14 Nov 2023 14:52:50 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48658 Tue 06 Feb 2024 15:26:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34442 Tue 03 Sep 2019 18:00:55 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41195 Momordica cochinchinensis Spreng.), which is considered as waste of Gac processing, has been found to possess high levels of carotenoids and other antioxidants. This study aimed at determining the optimal conditions of an ultrasound-assisted extraction for recovering carotenoids and antioxidant capacity from Gac peel. A response surface methodology using the Box–Behnken design was employed to investigate the impact of extraction time, temperature and ultrasonic power on the recovery of total carotenoid and antioxidant capacity. The results showed that an extraction time of 76 min, temperature of 50 °C and ultrasonic power of 250 W were the optimal conditions for the extraction. The experimental carotenoid yield and antioxidant capacity obtained under the optimal extraction conditions were validated as 269 mg/100 g DW (dry weight) and 822 µM TE (Trolox equivalent)/100 g DW, respectively. These values were not significantly different from the values predicted by the models. The HPLC analysis for carotenoid composition showed that β-carotene, lycopene and lutein were the principal carotenoids of the extract, which constitute 86% of the total carotenoid content. Based on the obtained results, the ultrasound-assisted extraction using ethyl acetate under the above optimal conditions is suggested for the simultaneous recovery of carotenoids and antioxidant capacity from Gac peel.]]> Thu 28 Jul 2022 11:12:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37278 Salacia chinensis L. root; investigate the impact of solvents on yield; optimise the ultrasound-assisted extraction (UAE) technique; and compare mangiferin yield with continuously shaking extraction (CSE) and decoction techniques. The results showed that mangiferin, with a purity of over 88%, could be achieved by HPLC using a mixture of solvent A (water: acetonitrile: orthophosphoric acid, 96.8:3:0.2 (v/v/v)) and solvent B (acetonitrile). Solvent type significantly affected the extraction yield of mangiferin, and a mixture of acetone and water gave the highest extraction yield, as compared to other solvents or mixtures. UAE conditions, such as ultrasonic power, temperature, time and concentration of acetone significantly affected the extraction of mangiferin. Optimal UAE conditions were at an ultrasonic power of 250 W, temperature of 50 °C, acetone concentration of 40% and extraction time of 60 min. These optimal conditions could extract approximately 92 mg, whereas CSE and decoction only extracted 89.20 mg and 58.71 mg of mangiferin, respectively, from 1 g of S. chinensis root. Therefore, these UAE conditions are recommended for the extraction of mangiferin from S. chinensis root for further utilisation.]]> Thu 27 Jan 2022 15:56:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47189 Thu 18 May 2023 14:48:16 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:40628 Thu 11 Aug 2022 11:14:14 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46060 0.05). Thus, soaking is not required for the ETHOS X extraction of polyphenols from LSTT leaves. RSM was successfully applied to explore the impact of ETHOS X extraction conditions and optimize the extraction conditions. Radiation time significantly affects the recovery yield of phenolics (p < 0.05) positively, whereas irradiation power and sample to solvent ratio adversely influenced the extraction yields of phenolics. The optimal ETHOS X extraction conditions were: radiation time of 60 min, irradiation power of 600 W, and sample to solvent ratio of 2 g/100 mL. Under these conditions, 119.21 ± 7.09 mg of phenolic, 85.31 ± 4.55 mg of flavonoids, and 137.51 ± 12.52 mg of proanthocyanidins can be extracted from a gram of dried LSTT leaves. In comparison with UAE and SWB, ETHOS X is not more effective for the extraction of phenolics than UAE and SWB. However, this technique can save half of the solvent volume compared to UAE and SWB techniques.]]> Thu 10 Nov 2022 11:28:04 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34483 Thu 01 Aug 2019 16:36:16 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:9512 Sat 24 Mar 2018 08:35:35 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20130 Sat 24 Mar 2018 07:51:33 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33110 Mon 23 Sep 2019 11:39:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34882 Mon 23 Sep 2019 10:51:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47536 Mon 23 Jan 2023 12:22:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33404 Catharanthus roseus leaf have been used for the extraction of alkaloids, which results in a significant amount of waste that includes the stems, roots, and the extracted leaves. This study aimed to determine the optimal extraction conditions, by applying response surface methodology with Box–Behnken design to assess the interactive effect of ultrasonic parameters, including ultrasonic temperature, time, ratio of sample‐to‐solvent, and ultrasonic power on the extraction efficiency of saponins and antioxidants from the stems of C. roseus. The results revealed that a maximized saponin yield (138.21 mg ESE/g) and strong antioxidant activities (8.34, 12.06, 10.53, and 19.15 mg TE/g for DPPH, ABTS scavenging capacity, FRAP, and CUPRAC, respectively) could be obtained under the optimal extraction conditions: ultrasonic temperature of 55 °C, ultrasonic time of 35 min, sample‐to‐solvent ratio of 1/100 (g/ml), and ultrasonic power of 150 W. Practical applications: Recovering bioactive compounds from Catharanthus roseus stems, especially saponins which have been linked with various biological activities such as antimicrobial, antiherbivore, and/or cytotoxic activities, is necessary to avoid wasting bioresource from the alkaloid exploration of the leaves. This study suggested the optimal ultrasonic conditions that could be used for further extraction and isolation of saponins from C. roseus stems for potential application in the food, nutraceutical, cosmeceutical, and pharmaceutical industries.]]> Fri 26 Oct 2018 16:04:20 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27736 Fri 26 May 2017 11:27:53 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33079 Fri 24 Aug 2018 15:01:54 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41827 Fri 12 Aug 2022 12:52:20 AEST ]]>