**4. Conclusions**

Silkworm and silkworm powder contain antioxidant activities. The results showed that thermal processing could affect the antioxidant activity and some physicochemical properties during the production of silkworm powder. Shorter exposure time to hot water and a lower drying temperature should be applied to prevent the loss of bioactive compounds in silkworm powder. Silkworm powder could be a potential protein source for animal products, and the application may lead to valuable findings in various fields such as pharmaceutical and cosmetic industries.

**Author Contributions:** A.A. and S.J. developed the study design. A.A. performed the experiments. A.A. and Y.Y.L. interpreted the data, drafted the manuscript, and revised the manuscript. S.J., S.J.L., and W.A.W.M. supervised the project and checked on the manuscript. All authors read and approved the final version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** This research was funded by the Dana Modal Insan (MI-2020-007) research grant provided by Universiti Kebangsaan Malaysia, Tech Enterprise Service Network of Ministry of Science and Technology, Thailand and private grant from NTGS Co. Ltd., Thailand.

**Conflicts of Interest:** The authors declare no conflict of interest.
