Authors:G. Madhurambal, B. Ravindran, M. Mariappan, K. Ramamurthi, and S. C. Mojumdar
Thermal and spectral analyses are very useful techniques for materials characterization. Therefore, many investigators have used these techniques for various materials characterization [ 1 – 14 ]. Cinnamicacid (3
Authors:J. Bukowski, J. Szul, R. Kański, and M. Kańska
Convenient and efficient route of the synthesis of [3-14C] cinnamic acid is reported. [1-14C]Benzoic acid, prepared by carbonation of Grignard reagent with [14C]carbon dioxide, was reduced to [1-14C]benzyl alcohol. In the enzymatic step this alcohol was selectively oxidised to [1-14C]benzaldehyde using enzyme YADH (Ec. 184.108.40.206) and immediately condensed with malonic acid. This combined chemical and enzymatic approach allows to obtain [3-14C]cinnamic acid with radiochemical yield higher than 50% in respect to the starting alcohol.
Authors:G. Angelini, M. Speranza, M. Felici, and M. Luna
A series of substituted cinnamic acids labelled at the ring positions with deuterium or tritium has been easily obtained via the Doebner modification of Knoevenagel condensation reaction between labelled benzaldehyde derivatives and malonic acid in pyridine. The substituted benzaldehyde precursors were synthesized by isotope exchange method in deuterated or tritiated water at 80 °C in acidic medium. Ring-tritiated substituted cinnamic acids with specific activity ranging from 207 GBq /5.6 Ci/ mol–1 to 4366 GBq /118 Ci/ mol–1 was obtained using ca. 37 GBq /1 Ci/ of HTO.
Zygosaccharomyces lentus is a significant, recently discovered new osmophilic spoilage yeast, capable of growth at low temperatures. It is remarkably resistant to commonly used preservatives above the legally permitted levels. Therefore, antimicrobial effect of chitosan, cinnamic acid, carvacrol and cymene as new preservatives was tested against Z. lentus in phosphate buffered saline at pH 7.3. Z. lentus was resistant to the antimicrobial action of chitosan (0.5 and 1.0%) and cinnamic acid (0.5–2.0 mM) but was sensitive to the biocidal action of 1.5 and 2.0 mM cymene and 1.5 and 2.0 mM carvacrol in pH-neutral buffer. Further work would need to be done to check the sensitivity of this organism to these compounds at other pH values and temperatures.
Authors:L. Tian, N. Ren, J. Zhang, H. Liu, S. Sun, H. Ye, and K. Wu
The two complexes of [Ln(CA)3bipy]2 (Ln = Tb and Dy; CA = cinnamate; bipy = 2,2′-bipyridine) were prepared and characterized by elemental analysis, infrared
spectra, ultraviolet spectra, thermogravimetry and differential thermogravimetry techniques. The thermal decomposition behaviors
of the two complexes under a static air atmosphere can be discussed by thermogravimetry and differential thermogravimetry
and infrared spectra techniques. The non-isothermal kinetics was investigated by using a double equal-double steps method,
the nonlinear integral isoconversional method and the Starink method. The mechanism functions of the first decomposition step
of the two complexes were determined. The thermodynamic parameters (ΔH≠, ΔG≠ and ΔS≠) and kinetic parameters (activation energy E and the pre-exponential factor A) of the two complexes were also calculated.
Authors:B. Ravindran, G. Madhurambal, M. Mariappan, K. Ramamurthi, and S. C. Mojumdar
Cinnamicacid ( Fig. 1 ), a derivative of phenyl alanine, is part of a relatively large family of organic isomers [ 1 – 4 ]. Thermal and spectral analyses are very useful techniques for materials characterization
Authors:Liang Zheng, Mengyue Wang, Zhong Chen, Jincai Hou, and Xiaobo Li
cinnamicacid) [ 15 – 17 ]. On the other hand, the assistant herb, Angelicae sinensis radix, supported the monarch and minister herbs to reach target positions and exert their effects. It mainly consists of organic acids (such as ferulic acid) and volatile