Table 1. Effect of different pre-treatment methods on pH and color of hot-air dried Hermetia illucens larvae
Variable | Raw | HD | HB | HR | HS |
pH | 5.97±0.05d | 8.12±0.03c | 8.72±0.01a | 8.20±0.01b | 8.76±0.01a |
Color |
CIE L* | 48.61±0.75a | 25.43±0.89c | 29.60±0.67b | 24.88±0.32c | 29.54±0.12b |
CIE a* | 0.89±0.34c | 0.59±0.10d | 1.64±0.02a | 0.57±0.07d | 1.31±0.01b |
CIE b* | 10.33±0.29a | 1.23±0.17d | 4.64±0.24b | 1.41±0.13d | 3.82±0.15c |
ΔE1) | - | 24.91±0.04a | 19.86±0.44b | 25.35±1.03a | 20.15±0.66b |
All values are mean±SD of three replicates (n=3).
The color value of raw was used as a standard to compare color differences between other treatments, and the color difference was calculated according to the CIE76 △E formula [(△L*2 + △a*2 + △b*2)1/2].
Means within a row with different letters are significantly different (p<0.05).
Raw, non-dried insect; HD, hot air-dried insect without pre-treatment; HB, hot air-dried insect after blanching; HR, hot air-dried insect after roasting; HS, hot air-dried insect after super-heated steaming.