https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43713 Wed 28 Sep 2022 10:22:51 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48605 Wed 22 Mar 2023 09:01:15 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35277 Wed 04 Mar 2020 09:19:17 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36239 Tue 17 Mar 2020 12:32:29 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42901 Helicteres hirsuta Lour. (H. hirsuta L.) have been used as traditional medicines, however limited studies have been conducted on the preparation of dried material or the extraction of bioactive compounds. This study aimed to determine the effect of various solvents and drying methods on the bioactive compound yield and antioxidant capacity of the H. hirsuta L. stem. The results showed that water was the best solvent for obtaining the highest levels of phenolics and flavonoids, whereas methanol was the solvent of choice for saponin extraction. Among assessed drying methods, hot-air drying at 80C revealed as the best method to maintain the bioactive components (phenolics of 8.99 mg GAE/g, flavonoids of 9.60 mg CE/g and saponins of 15.18 mg ESE/g), and DPPH, ABTS, and FRAP antioxidant activities. Thus hot-air drying at 80C is recommended for preparation of dried H. hirsuta L. stem for further processing steps.]]> Tue 06 Sep 2022 15:35:23 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55512 Tue 04 Jun 2024 20:56:25 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 ]]>