Table 1. Viable counts from the analyzed samples.
| Samples | Total mesophilic aerobes | Bacterial spores | Lactic acid bacteria | Enterobacteriaceae |
|---|---|---|---|---|
| Rearing chain 1 | ||||
| C | 8.13±0.03 a | 7.45±0.02 b | 7.42±0.01 a | 5.35±0.06 a |
| HC | 6.08±0.00 c | 5.92±0.01 c | 3.89±0.10 c | 3.30±0.02 b |
| HCF | 7.77±0.03 b | 7.71±0.04 a | 6.29±0.08 b | <1 c |
| Rearing chain 2 | ||||
| S | 5.83±0.04 c | 2.53±0.04 c | 3.93±0.04 c | 4.18±0.08 c |
| HS | 7.13±0.03 b | 3.36±0.08 b | 7.00±0.00 b | 6.90±0.01 b |
| HSF | 10.50±0.06 a | 4.14±0.01 a | 7.46±0.01 a | 7.48±0.01 a |
Results are expressed as log colony forming units (cfu) g-1. For microbial counts, means ± standard deviations of triplicate independent experiments are shown. For each rearing chain, within each column, means with different superscript letters are significantly different (P < 0.05). C, coffee by-product; HC, H. illucens reared on coffee by-product; HCF, frass of H. illucens reared on coffee by-product; S, vegetable substrate; HS, H. illucens reared on vegetable substrate; HSF, frass of H. illucens reared on vegetable substrate.