The antioxidant activity of the extracts obtained was estimated by scavenging activity against DPPH radicals. This test was performed to evaluate if the remaining thymol in the polymer matrix was enough to be considered an efficient antioxidant in these formulations.Results are also shown in Table 1. All extracts containing thymol showed an important antioxidant activity, as determined by the inhibition of the DPPH radical. The inhibition values are indicative of the amount of thymol remaining in the polymer matrix, which is able to act as an active (antioxidant) agent. In addition, thymol could protect the polymer matrix from oxidative degradation during processing and further the use of these nano-biocomposites