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Table 2 Effect of various physicochemical parameters on extracellular β-glucosidase (β-GL) production (on dry mass basis) by Aspergillus sp. DHE7 in solid state fermentation (SSF)

From: Optimization of extracellular ethanol-tolerant β-glucosidase production from a newly isolated Aspergillus sp. DHE7 via solid state fermentation using jojoba meal as substrate: purification and biochemical characterization for biofuel preparation

Agro-industrial substrate β-GL activity/(U/g)
Jojoba meal 116.4 ± 2.4
Rice husk 13.8 ± 0.8
Rice straw 15.1 ± 0.3
Sugar beet bulb 32.9 ± 1.2
Sugarcane bagasse 27.3 ± 1.9
Sunflower oil cake 43.8 ± 1.4
Cotton seed waste 78.5 ± 2.5
Olive oil cake 23.1 ± 0.4
Rice bran 33.2 ± 1.1
Wheat bran 84.3 ± 4.4
Wheat germ 54.6 ± 2.1
pH
 4.0 44.3 ± 2.4
 5.0 117.3 ± 4.1
 6.0 126.4 ± 3.7
 7.0 104.5 ± 3.6
 8.0 86.5 ± 2.1
Moisture/%
 33 56.2 ± 1.4
 50 82.4 ± 2.6
 60 125.7 ± 2.8
 70 141.6 ± 4.6
 75 124.5 ± 3.2
 80 89.3 ± 2.8
 85 77.5 ± 1.7
 90 63.2 ± 2.3
Incubation/h
 24 00.00
 48 55.1 ± 1.5
 72 152.8 ± 4.3
 96 139.4 ± 2.6
 120 119.7 ± 2.4
Temperature/C°
 25 93.1 ± 2.3
 30 151.2 ± 3.4
 35 167.2 ± 5.1
 40 112.6 ± 4.2
 45 77.5 ± 3.7
Inoculum size/(spore/mL)
 0.64 × 107 96.2 ± 3.1
 1.27 × 107 163.5 ± 4.9
 2.54 × 107 174.6 ± 5.8
 3.81 × 107 143.2 ± 4.3
 5.04 × 107 106.1 ± 2.8
  1. Data are expressed as mean value ± S.D. of triplicate measurements