Abstract
Background: A number of synthetic scaffolds, along with natural products, have been
identified as potent antioxidants. The present study deals with the evaluation of varyingly substituted,
medicinally distinct class of compounds “chalcones and bis-chalcones” for their antioxidant potential.
Methods: In vitro radical scavenging activities were performed on a series of synthetic chalcones 1-
13 and bis-chalcones 14-18.
Results: All molecules 1-18 revealed a pronounced 2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2ʹ-
azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals scavenging potential in the
ranges of IC50s = 0.58 ± 0.14 - 1.72 ± 0.03 and 0.49 ± 0.3 - 1.48 ± 0.06 μM, respectively. Ascorbic
acid (IC50s = 0.5 ± 0.1 and 0.46 ± 0.17 μM for DPPH and ABTS, respectively) was used as a standard
radical scavenger.
Conclusion: Structure-activity relationship (SAR) revealed an active participation of various
groups, including -SMe and -OMe in scavenging activity.
Keywords:
Chalcones, bis-chalcones, reactive oxygen species (ROS), DPPH, ABTS, in vitro.
Graphical Abstract
[2]
Halliwell, B.; Gutteridge, J.M.C. Free Radicals in Biology and Medicine; Oxford University Press: Oxford, 1989, pp. 1-81.
[13]
Özdemir, Ö. Studies on phenol-keto tautomerism, metal ion binding, and free radical scavenging properties of newly synthesized naphthalene-based tetraimine Schiff base. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2018, 20, 109-123.
[14]
Ahad, G.; Khan, M.; Khan, A.; Ibrahim, M.; Salar, U. Kanwal; Khan, K. M.; Perveen, S. Synthesis, structural characterization, and antioxidant activities of 2,4-dinitrophenyl-hydrazone derivatives. J. Chem. Soc. Pak., 2018, 40, 961-973.
[15]
Ajaib, M.; Almas, M.; Khan, K.M.; Perveen, S.; Shah, S. Phytochemical screening, antimicrobial and antioxidant activities of Ficus natalensis. J. Chem. Soc. Pak., 2016, 38, 345-351.
[16]
Ajaib, M.; Arooj, T.; Khan, K.M.; Farid, S.; Ishtiaq, M.; Perveen, S.; Shah, S. Phytochemical, antimicrobial and antioxidant screening of fruits, bark and leaves of Lagerstroemia indica. J. Chem. Soc. Pak., 2016, 38, 538-545.
[20]
Laird, T. Ullmann’s encyclopedia of industrial chemistry; VCH: Weinheim, Germany, 1997, p. 8.
[23]
Dhar, D.N. The chemistry of chalcones and related compounds; John Wiley: New York, 1981.
[36]
Khan, A.N.; Khan, R.A.; Ahmad, M.; Mushtaq, N. Role of antioxidant in oxidative stress and diabetes mellitus. J. Pharmacogn. Phytochem., 2015, 3, 217-220.
[45]
Khan, K.M.; Rahim, F.; Khan, A.; Ali, S.; Taha, M.; Saad, S.M.; Khan, M. Najeebullah; Shaikh, A.; Perveen, S.; Choudhary, M. I. Synthesis of benzophenone hydrazone analogs and their DPPH radical scavenging and urease inhibitory activities. J. Chem. Soc. Pak., 2015, 37, 479-483.