Synthesis, spectroscopic properties, crystal structures, antioxidant activities and enzyme inhibition determination of Co(II) and Fe(II) complexes of Schiff base

Considering the importance of metal complexes in the development of medical science, two different Schiff base Fe(II) and Co(II) metal complex compounds were synthesized with Schiff base obtained through the condensation of 1-(4-aminophenyl)ethanone with 2-hydroxy-3-methoxybenzaldehyde. The reactions of the ligand with Co(II) and Fe(II) metal ions enabled six coordination compounds with octahedral geometries. The novel metal complexes were characterized by IR, elemental analyses, magnetic susceptibility, mass spectra, UV-Vis, thermogravimetry-differential thermal analysis (TGA-DTA) and X-ray diffraction analysis. The antioxidant properties of the new compounds were investigated using different in vitro assays. Moreover, enzyme inhibition of derivatives complexes against carbonic anhydrase I and II isoenzymes (CA I and II) and acetylcholinesterase (AChE) was evaluated. The best inhibitor complex for CA I and II isoenzymes was the Fe(II) complex with K-i values of 52.83 +/- 11.52 and 63.34 +/- 8.88, respectively

Sage (Salvia pilifera): determination of its polyphenol contents, anticholinergic, antidiabetic and antioxidant activities

In this work, we determined for the first time the Salvia pilifera Montbret & Aucher ex Bentham as an important source for natural products with antioxidant and antidiabetic potentials. In this context, methanol (MESP) and water (WESP) extracts were prepared from aerial parts of S. pilifera. Also, it was evaluated for antioxidant profile by eight distinguishes bioanalytical methods and inhibition effects against enzymes linked to different diseases, namely butyrylcholinesterase (BChE), acetylcholinesterase (AChE), ?-glycosidase and ?-amylase. Also, the polyphenolic compositions of MESP and WESP were evaluated by high performance liquid chromatography and tandem mass spectrometry (LC–MS/MS). Fourteen phenolics were identified in the evaporated MESP and thirteen phenolic compounds were identified in the lyophilized WESP. Also, we performed the antioxidant properties of both extracts. In order to estimate the capacity of MESP and WESP to act as antioxidants, 1,1-diphenyl-2-picryl-hydrazyl radicals (DPPH·), 2,2´-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) radicals (ABTS·+) and N,N-dimethyl-p-phenylenediamine radicals (DMPD·+), scavenging activities, ferric ions (Fe3+), Fe3+-TPTZ and cupric ions (Cu2+) reducing assays were studied. MESP and WESP were found as potent effective DPPH· (IC50: 7.05 and 8.56 µg/mL), ABTS·+ (IC50: 3.52 and 4.76 µg/mL) and DMPD·+ (IC50: 28.92 and 30.95 µg/mL) scavenging effects. On the other hand, MESP and WESP showed the potent inhibition effects against AChE (IC50: 94.93 and 138.61 µg/mL), BChE (IC50: 60.05 and 99.13 µg/mL), ?-glycosidase (IC50: 23.28 and 36.47 µg/mL) and ?-amylase (IC50: 46.21 and 97.67 µg/mL) enzymes. This study will be an innovative and guider for further studies for antioxidant properties for industrial or medicinal plants. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.King Saud University, KSUS.A. would like to extend his sincere appreciation to the Distinguished Scientist Fellowship Program at King Saud University for funding this research

Accounting in Turkey with reference to the particular problems of lease transactions

Leasing in Turkey has grown rapidly in the later part of the 1980s. This has presented challenges to accountants which have yet to be resolved. At present the country does not have an accounting standard on this topic and as a consequence transactions are recorded in accordance with tax laws. This paper considers the development of accounting in Turkey and whether the principles stated in International Accounting Standard (IAS) 17 on leasing are applicable for Turkey. The responses to questionnaires sent to accountants in Turkey suggest that the principles in IAS 17 are acceptable to accountants in that country.