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Supported nickel has been used in a wide range of applications for industrial reactions, such as steam reforming, hydrogenation and methanation. In this work, nickel aluminate was prepared by the sol-gel process using alumatrane as the alkoxide precursor, directly synthesized from the reaction of inexpensive and available compounds, aluminum hydroxide and TIS (triisopropanolamine) via the oxide one pot synthesis (OOPS) process. Various conditions of the sol-gel process, such as pH, calcination temperature, hydrolysis ratio and ratio of nickel to aluminum, were studied. All samples were characterized using FTIR, TGA, XRD, TPR, DR-UV and BET. The BET surface area was in the range of 340-450 m 2 /g at the calcination temperature of 500 • C with a mesoporous pore size distribution. Catalyst activity testing in CO oxidation reaction depended on Ni : Al ratio and calcination temperature. Higher activity was obtained from higher Ni content and lower calcination temperature. In addition, catalysts prepared using alumatrane precursor had higher percentage conversion than those prepared using aluminum hydroxide precursor.

The ultimate aim of this study was to evaluate antioxidant activities using DPPH and ABTS assay and antioxidant substances of Melientha suavis Pierre (Melientha) extracts with ethanol (EtOH) and subsequent partition with hexane, dichloromethane (CH2Cl2), ethyl acetate (EtOAc) and distilled water (W). The Melientha extract was assessed the sunscreen activities by sun protection factor which was compared with octyldimethyl PABA. Additionally, the stability test of Melientha extracts added in the cosmetic base-formula was investigated. The sun protection substances of Melientha extracts were determined by GC-MS analysis. Among the extract and fractions, the ethanolic extract showed the highest activities. The IC50 of Melientha extract to free radical scavenging determined by DPPH assay and ABTS assay were 53.20 ± 7.37 μg/ml and 64.17 ± 5.76 μg/ml, respectively. The total phenolic compound of ethanol extract was 149.87 ± 2.72 mg GE/g of ext and total flavonoid content was 51.60 ± 4.12 mg CE/g of ext. The sun protection factor (SPF) of ethanol extract was 26.61 ± 0.10. Cinamate and its derivative which were claim as sunscreen substance was found by GC-MS analysis of Melientha ethanol extract.