Table 4.
Heavy metal content (mg/kg dry matter basis) of black soldier fly larvae grown on three different feeds and killed by blanching and freezing (means and SD).
| F1 | F2 | F3 | BSFL F1 B |
BSFL F1 F |
BSFL F2 B |
BSFL F2 F |
BSFL F3 B |
BSFL F3 F |
|
|---|---|---|---|---|---|---|---|---|---|
| Al | 65.24 ± 0.02 | 60.75 ± 0.03 | 59.97 ± 0.04 | 17.59 c ± 0.81 | 52.00 a ± 0.06 | 20.25 c ± 1.2 | 28.16 b ± 1.17 | 27.96 b ± 1.09 | 32.16 b ± 0.08 |
| Cr | 0.65 ± 0.12 | 0.37 ± 0.92 | 2.99 ± 0.32 | 0.22 c ± 0.04 | 0.52 a ± 0.02 | 0.46 a ± 0.03 | 0.47 a ± 0.05 | 0.31 b ± 0.04 | 0.33 b ± 0.03 |
| As | 0.05 ± 0.25 | 0.05 ±0.02 | 0.00 ±0.01 | 0.15 b ± 0.01 | 0.12 a ± 0.01 | 0.02 c ± 0.01 | 0.06 c ± 0.01 | 0.03 b ± 0.01 | 0.03 b ± 0.01 |
| Cd | 0.02 ± 0.01 | 0.02 ± 0.01 | 0.01 ± 0.12 | 0.11 b ± 0.01 | 0.17 a ± 0.01 | 0.12 b ± 0.01 | 0.12 b ± 0.01 | 0.11 a ± 0.01 | 0.17 b ± 0.01 |
| Hg | <DL | <DL | <DL | <DL | <DL | <DL | <DL | <DL | <DL |
| Pb | 0.14 ± 0.01 | 0.08 ± 0.01 | 0.12 ± 0.01 | 0.13 e ± 0.01 | 0.18 c ± 0.01 | 0.23 b ± 0.01 | 0.26 a ± 0.01 | 0.16 d ± 0.01 | 0.14 e ± 0.01 |
| Fe | 244.0 ± 0.7 | 146.0 ± 0.8 | 258.0 ± 0.5 | 144.7 d ± 0.4 | 252.7 a ± 0.1 | 185.4 c ± 0.2 | 210.6 b± 0.6 | 201.2 bc ± 0.9 | 197.3 bc ± 0.3 |
| Mn | 165.0 ± 0.3 | 99.0 ± 0.7 | 107.0 ± 0.6 | 525.7 a ± 0.1 | 454.2 c ± 0.7 | 490.0 abc ± 0.1 | 493.9 abc ± 0.3 | 470.8 bc ± 0.9 | 519.7 ab ± 0.8 |
| Sn | 0.14 ± 0.01 | 0.01 ± 0.01 | 0.24 ± 0.01 | 0.01 ± 0.02 | 0.03 ± 0.01 | 0.02 ± 0.01 | 0.02 ± 0.01 | 0.04 ± 0.01 | 0.02 ± 0.01 |
| Zn | 112.0 ± 0.65 | 90.0 ± 0.22 | 108.0 ± 0.13 | 129.8 d ± 0.35 | 220.6 a ± 0.23 | 134.0 d ± 0.15 | 139.7 cd ± 0.93 | 146.6 c ± 0.71 | 166.8 b ± 0.10 |
a–e Means with different superscripts within rows differ significantly (p < 0.05). Al (Aluminum), As (Arsenic), Cd (Cadmium), Cr (Chromium), Fe (Iron), Hg (Mercury), Mn (Manganese), Pb (Lead), Sn (Tin), Zn (Zinc). F1 = Feed 1 Broiler-based; F2 = Feed 2 Brewers grain; F3 = Feed 3 Cereal grain; B—Blanched, F—Frozen. Detection Limit (DL) for Hg = 1 µg/kg.