This study evaluated the Protaetia brevitarsis larvae powder’s characteristic changes using hot air drying (60±2.5oC, 12 h) with different pre-treatment methods, including two sacrifice methods, two storage temperatures, and two defatting processes. Appearance, yield, moisture contents, pH, color, proximate analysis, volatile basic nitrogen level, DPPH radical scavenging activity, and total phenol content were assessed. Results revealed that a combination of blanching, defatting, and -20oC storage temperature resulted in higher total phenol contents, lower water contents, and lower volatile basic nitrogen levels than other methods. Defatted treatment resulted in a higher L-value than the non-defatted treatment. Taken together, these results indicate that a combination of -20oC storage, blanching, and defatting is the optimal pre-treatment method for obtaining P. brevitarsis larvae powder with high total phenol content, low water content, and low volatile basic nitrogen, taking into account cost efficiency considerations.

Abstract
Introduction
Materials and Methods
    Materials
    Preparation of P. brevitarsis larvae powder
    Defatting P. brevitarsis larvae powder
    Appearance, yield, approximate composition
    pH and color measurements
    Determination of volatile basic nitrogen (VBN)
    Total phenolic content
    DPPH radical scavenging activity
    Statistical analysis
Results and Discuusion
    Appearance and Yield
    Proximate composition
    pH and Color
    Volatile basic nitrogen (VBN)
    Total phenolic contents and DPPH radical scavengingactivity
Conclusion
Acknowledgments
Author Disclosure Statement
References

• Ha Young Kim(Department of Food Science and Engineering, Jeju National University)
• Duri Kim(Department of Food Science and Engineering, Jeju National University)
• Ji-Yeon Chun(Department of Food Science and Engineering, Jeju National University) Corresponding author