Ciênc. Tecnol. Aliment., Campinas, 21(1): 10-13, jan.-abr. 2001 1 Recebido para publicação em 11/09/98. Aceito para publicação em 30/06/00. 2 Jahan Vegetable Oil Co., Research Department. 16 Daman Afshar st., wali-Assr Ave., Above wanak sq. Tehran 19697, Iran. SUMMARY Spent nickel catalyst (SNC) has the potential of insulting the quality of the environment in a number of ways. Its disposal has ...

A promising strategy to break through the selectivity-conversion limit of direct methane conversion achieve high yields is protection methanol via esterification a more stable methyl ester. We present an aerobic methane-to-methyl-ester approach that utilizes highly dispersed, cobalt-containing solid catalyst, along with significantly favorable reaction conditions compared existing homogeneously...

We performed first-principles density functional theory (DFT) and $GW$ calculations to investigate electronic structures of bulk few-layer ${\mathrm{PdSe}}_{2}$. obtained the quasiparticle band structure ${\mathrm{PdSe}}_{2}$, energy gap agrees excellently with reported experimental value. For monolayer bilayer we respect vacuum level. analyzed DFT $\mathit{GW}$ in detail, finding $k$-space pos...

Flavonoids from Sophora flavescens were selectively extracted by mechanochemical-promoted extraction technology (MPET) after using response surface methodology to determine the optimal extraction parameters. The highest yield of 35.17 mg/g was achieved by grinding the roots with Na₂CO₃ (15%) at 440 rpm/min for 17.0 min and water was used as the sole solvent with a ratio of solvent to solid mate...

Quercetin is a biological flavonoid, which can be found in red kidney bean at high concentration. In this study, a comparison was conducted between traditional and modern extraction methods. Sequential microwave-assisted extraction was used for isolation of quercetin from red kidney bean. The effect of several factors such as particle size of grinded kidney bean, extraction solvent, microwave p...

The complexity of sample matrices, coexistence of multiple forms of bioactive phytochemicals, and their interaction of with other cellular components pose a significant challenge for optimized extraction and accurate estimation of bioactive phytochemicals in foods and dietary supplements. This article discusses the significance of optimizing extraction procedures for accurate assay of phytochem...