| 1 | Physicochemical properties and in vitro antioxidant activities of pyroligneous acid prepared from brushwood biomass waste of Mangosteen, Durian, Rambutan, and Langsat显示文摘Physicochemical characteristics and in vitro antioxidant activities of four pyroligneous acids carbonized from the wastes of wood species including Mangosteen (Garcinia mangostana Linn.), Durian (Durio zibethinus L.), Rambutan (Nephelium lappaceum L.), and Langsat (Lansium domesticum Serr.) were assessed. Appearing as transparent liquors with pH 3.9–4.2, the pyroligneous acid samples under test possessed acetic acid (23.22–25.46%) as the dominant component. The total soluble tar, total acid, and water content were 0.15 - 0.28 wt%, 99–192 mg KOH/g and 84.5–93.5 wt%, respectively. Phenolic compounds namely: 2,6-dimethoxyphenol (6.88–9.69%),phenol (2.97–5.88%), 4-methylsyringol (3.10–3.56%), guaiacol (2.36–3.55%), and 2-methoxy-4-methylphenol (1.08–1.28%) were found. All had in vitro antioxidant activities especially mangosteen pyroligneous acid, which showed activity roughly similar to BHT (P>0.05) against anti-lipid peroxidation. Nitric oxide scavenging capacities of all pyroligneous acids were significantly higher than BHT (P<0.05). Our results suggest that pyroligneous acids from the four types of branch waste could be used as sources of beneficial natural antioxidants, possibly as food or feed additives to protect against lipid peroxidation, and potentially also in veterinary medicine in anti-inflammatory products. | Yongyuth Theapparat Sunisa Khongthong Prawit Rodjan Kowit Lertwittayanon Damrongsak Faroongsarng | 2019 | Journal of Forestry Research2019，30，3： | 3 |
| 2 | Fabrication and photocatalytic activity of TiO2 composite membranes via simultaneous electrospinning and electrospraying process显示文摘In present study, a simultaneous electrospinning and electrospraying(SEE) process was employed to produce microclusters of TiO_2 nanoparticles and interlock them in nanofibrous network. The photocatalytic composite membranes(PCMs) were fabricated by electrospraying TiO_2 nanoparticle suspension into microcluster form that dispersed and entrapped within nylon-6 electrospun fiber membrane. Three PCMs membrane with TiO_2 content of 52.0, 83.6,and 91.7 wt.% were successfully fabricated. The membrane consisted of TiO_2 microclusters,ranging in sizes from around 0.3 to 10 μm, distributed uniformly within the nylon-6 nanofibrous network. PCMs photocatalytic activity against Methylene Blue(MB) in aqueous solution showed more than 98% MB removal efficiency after 120 min of photocatalytic oxidation(PCO) for all PCMs. For PCM with the highest TiO_2 content tested for 5 PCO cycles, it was found that most of their TiO_2 content remained incorporated within the nanofibrous structure. The concept of nanoparticles clusters entrapment with SEE fabrication employed here provide a simple and effective method for reducing detachment of nanostructure phase from nanocomposite membrane. | Taddao Pahasup-anan Kowit Suwannahong Wipada Dechapanya Ratthapol Rangkupan | 2018 | Journal of Environmental Sciences2018，30，10： | 2 |
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