https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:9026 Wed 11 Apr 2018 13:34:25 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:17541 2). In this study, we calculate energy profiles for the sequence: reactant + HO₂ → [complex of reactants] → transition state → [complex of products] → product + H₂O₂ for methanol, ethenol (i.e., C₂H₃OH), acetaldehyde, toluene, and phenol. Rate constants are provided in the simple Arrhenius form. Reasonable agreement was obtained with the limited literature data available for acetaldehyde and toluene. Addition of HO₂ to the various distinct sites in phenol is investigated. Direct abstraction of the hydroxyl H was found to dominate over HO₂ addition to the ring. The results presented herein should be useful in modeling the lower temperature oxidation of the five compounds considered, especially at low temperature where the HO₂ is expected to exist at reactive levels.]]> Sat 24 Mar 2018 08:03:57 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29446 2) pre- Treatment in combination with cold storage has been shown to be an effective disinfestation treatment to kill quarantine pests such as fruit flies in horticultural produce. However, the effects of high CO₂ and cold treatments on fruit quality, including the development of chilling injury and offflavours, needs to be thoroughly examined. In this study, Navel oranges were treated with either air or 95% CO₂ in air for 48 h at 2°C then stored in air for up to 18 days at 2°C. Following treatment and storage, there was no evidence of any chilling injury and no significant changes in fruit soluble solids content (SSC) or titratable acidity (TA). Another storage trial examined the time taken for Navel oranges to recover from the 95% CO₂ treatment. In this experiment, fruit were stored at 2°C and ventilated with either air or 95% CO₂ in air for 70 h. After treatment, the fruit were stored in air and sampled after 1, 2, 3, 4, 5, 8, 9 and 10 days. The results showed that after the high CO₂ treatment, the levels of acetaldehyde significantly increased in CO₂- Treated fruit and ethanol whereas levels of ethanol decreased. However, within three days storage in air, levels of acetaldehyde returned to pre- Treatment concentrations. These results show the potential of using high CO₂ combination treatments as postharvest disinfestation treatments, which do not adversely affect fruit quality after treatment and storage. However more research is recommended to fully understand these fruit responses and their role in overall fruit quality.]]> Sat 24 Mar 2018 07:39:21 AEDT ]]>