Authors:Mirosław Hawrył, Renata Nowak and Monika Waksmundzka-Hajnos
Two-dimensional thin layer chromatography on cyano-bonded polar stationary phase was performed to optimize the separation of some antioxidant phenolic compounds from Eupatorium cannabinum extracts. Propan-2-ol mixed with n-heptane and ethyl acetate mixed with n-heptane were used as non-aqueous mobile phases in normal phase separations (1st direction of development in 2-dimensional high-performance thin-layer chromatography (2D-HPTLC mode)) and methanol mixed with water was used as a mobile phase in reversed phase (2nd direction of development in 2D-HPTLC mode). The plates were sprayed by use of Merck TLC sprayer using 2-(diphenylboryoxy)-ethylamine and PEG4000 (Merck, Darmstadt, Germany) or DPPH and photographed in CAMAG Cabinet UV lamp at 254 nm and 365 nm by use of Fuji 8 mpx camera. The plots RF non-aqueous mobile phase vs RF aqueous mobile phase were prepared to find optimal orthogonal 2D-TLC systems for the separation of investigated test compounds and then extracts from Eupatorium cannabinum. Satisfactory separations of antioxidant phenolic compounds in E. cannabinum extracts were obtained by use of optimized 2D-HPTLC systems.
Authors:M. F. Pinheiro da Silva, L. S. Soeira, K. R. P. Daghastanli, T. S. Martins, I. M. Cuccovia, R. S. Freire and P. C. Isolani
mineralization rates of organic pollutants [ 22 , 23 ].
In this study, CeO 2 , in three morphological forms, was used for catalytic ozonation of phenol. The correlation between properties of citrate-based precursors of oxides, oxide morphologies, and
Authors:M. V. Alonso, M. Oliet, J. C. Domínguez, E. Rojo and F. Rodríguez
The manufacturing process of phenol–formaldehyde (PF) resins has remained unchanged for several decades. However, numerous efforts have been carried out to reduce the dependence of this industry on phenol, the cost
Authors:K. Csepregi, Marianna Kocsis and Éva Hideg
Amarowich, R., Weidner, S. (2009) Biological activity of grapevine phenolic compounds. In: Roubelakis-Angelakis, K. A. (ed.) Grapevine Molecular Physiology and Biotechnology . Springer Science+Business Media B
Authors:N. Koczka, A. Ombódi, Z. Móczár and E. Stefanovits-Bányai
OBUS , J. , F LACZYK , E. , S IGER , A. , N OGALA-KALUCKA , M. ; K ORCZAK , J. & P EGG , R.B. ( 2009 ): Phenolic compounds and antioxidant activity of extracts of Ginkgo leaves . Eur. J. Lipid Sci. Tech. , 111 , 1150 – 1160
utilization of phenolic acids and their phenolic acid breakdown products on allelopathic interactions. J. Chem. Ecol. 24:685-708.
Effects of microbial utilization of phenolic acids and their phenolic acid breakdown products on