Skip to main content

Table 3 Summary of bioethanol production from immobilized cells and free cells in repeated batch fermentation with 100 g/l glucose at 42 °C for 40 h per batch

From: Effects of various inhibitory substances and immobilization on ethanol production efficiency of a thermotolerant Pichia kudriavzevii

ImmobilizationBatchEthanol conc. (g/l)Ethanol yields (% of the theoretical yield)Ethanol productivity (g/l/h)Statistical p values
Free cells136.9 ± 2.472.2 ± 4.70.9 ± 0.1
240.6 ± 0.879.5 ± 1.61.0 ± 0.0
342.1 ± 1.782.5 ± 3.31.1 ± 0.0
442.5 ± 1.483.1 ± 2.71.1 ± 0.0
Corncobs142.1 ± 0.782.4 ± 1.41.1 ± 0.00.0004***
242.3 ± 1.182.7 ± 2.21.1 ± 0.00.01*
342.6 ± 2.283.4 ± 4.31.1 ± 0.10.7, ns
444.5 ± 1.987.1 ± 3.71.1 ± 0.00.06, ns
Coconut wastes144.9 ± 0.587.9 ± 1.01.1 ± 0.00.00001***
244.4 ± 2.286.9 ± 4.31.1 ± 0.10.003**
341.4 ± 2.281.0 ± 4.31.0 ± 0.10.5, ns
436.0 ± 2.670.5 ± 5.10.9 ± 0.10.0004***
Calcium alginate beads138.3 ± 1.274.9 ± 2.31.0 ± 0.00.2, ns
239.4 ± 1.477.0 ± 2.71.0 ± 0.00.08, ns
342.2 ± 2.082.6 ± 3.91.1 ± 0.11.0, ns
434.9 ± 1.768.3 ± 3.30.9 ± 0.00.000008***
  1. Data are presented as the mean ± SD of the results from three biological replicates. One-way analysis of variance (ANOVA) was used to compare the ethanol production between the same batch of immobilized groups and the free cells group. Not significant p > 0.05, ns; statistically significant p ≤ 0.05*; very significant p ≤ 0.01**; highly significant p ≤ 0.001***