Molecules 2007, 12(8), 1836-1844; doi:10.3390/12081836
Article

Radical-scavenging Activity of the Reaction Products of Isoeugenol with Thiol, Thiophenol, Mercaptothiazoline or Mercaptomethylimidazole Using the Induction Period Method

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Received: 13 July 2007; in revised form: 9 August 2007 / Accepted: 9 August 2007 / Published: 13 August 2007
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The reaction products in the presence of Lewis acid of isoeugenol (1) with ethanethiol, thiophenol, 2-mercaptothiazoline or 2-mercapto-1-methylimidazole (ISO-S1 – ISO-S-4) were obtained. The radical-scavenging activity of these compounds was investigated using the induction period method for polymerization of methyl methacrylate (MMA) initiated by thermal decomposition of 2,2'-azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO) and monitored by differential scanning calorimetry (DSC). For BPO, the stoichiometric factor (number of free radicals trapped by one mole of antioxidant moiety, n) declined in the order isoeugenol (1.8) > ISO-S-1 (1.6) > ISO-S-2 (1.2 ) > ISOS- 3 (0.9) > ISO-S-4 (0.3), whereas for AIBN, their n values were about 1, except for ISOS- 3 (0.6). The ratio of the rate constant of inhibition to that of propagation (kinh/kp) for BPO declined in the order ISO-S-4 (56) > ISO-S-3 (15) > ISO-S-2 (11) >ISO-S-1 (9) > isoeugenol (8). Similarly, for AIBN the kinh/kp of the reaction products (33-57) was greater than that of isoeugenol (31). The reaction products of isoeugenol with a SH group showed greater inhibition rate constants (kinh) than the parent compound isoeugenol.
Keywords: radical-scavenging activity; thioisoeugenols; BPO; AIBN; induction period method
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MDPI and ACS Style

Kadoma, Y.; Kumada, W.; Asai, Y.; Sugita, Y.; Yokoe, I.; Fujisawa, S. Radical-scavenging Activity of the Reaction Products of Isoeugenol with Thiol, Thiophenol, Mercaptothiazoline or Mercaptomethylimidazole Using the Induction Period Method. Molecules 2007, 12, 1836-1844.

AMA Style

Kadoma Y, Kumada W, Asai Y, Sugita Y, Yokoe I, Fujisawa S. Radical-scavenging Activity of the Reaction Products of Isoeugenol with Thiol, Thiophenol, Mercaptothiazoline or Mercaptomethylimidazole Using the Induction Period Method. Molecules. 2007; 12(8):1836-1844.

Chicago/Turabian Style

Kadoma, Yoshinori; Kumada, Wakako; Asai, Yuhta; Sugita, Yoshiaki; Yokoe, Ichiro; Fujisawa, Seiichiro. 2007. "Radical-scavenging Activity of the Reaction Products of Isoeugenol with Thiol, Thiophenol, Mercaptothiazoline or Mercaptomethylimidazole Using the Induction Period Method." Molecules 12, no. 8: 1836-1844.

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