Isolation, characterization and insect growth inhibitory activity of major turmeric constituents and their derivatives againstSchistocerca gregaria (Forsk) andDysdercus koenigii (Walk)
Isolation, characterization and insect growth inhibitory activity of major turmeric constituents and their derivatives againstSchistocerca gregaria (Forsk) andDysdercus koenigii (Walk)
Two new curcumin derivatives, 1,7-bis(4-ethyloxy-3-methoxy-phenyl)-1,6-heptadiene-3,5-dione and 1,7-bis(4-butyloxy-3-methoxy-phenyl)-1,6-heptadiene-3,5-dione, are conveniently synthesized. Single and two-photon fluorescence of two compounds have been investigated. The two-photon absorption cross-sections (sigma) of the two compounds were calculated by quantum chemical method, which are as high as 386 and 418 x 10(-5) cm(4) s photon(-1) in dimethyl formamide (DMF), as well as up to 475 and 563 x 10(-5) cm(4) s photon(-1) in dichloromethane, respectively. Furthermore, cellular imaging results demonstrate that the as-prepared compounds have high photostability, strong fluorescence in the red region and are nontoxic up to 40 mu mol/L, which are suitable for long-term and high-specificity immunofluorescent cellular labeling. (C) 2013 Elsevier Ltd. All rights reserved.