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Table 2 Keratinolytic activity after pretreatment in an ultrasonic probe and without pretreatment at 3, 6 and 9 days, as well as the percentage of degradation obtained at the end of the fermentation process

From: Reactional ultrasonic systems and microwave irradiation for pretreatment of agro-industrial waste to increase enzymatic activity

Swine hair Enzymatic activity (U mL−1) Degradation (%)
3 days 6 days 9 days
Pretreatment by ultrasonic probe
 Micropoint 38.8 ± 5.3a 81.0 ± 5.2a 55.7 ± 3.0a 31.8 ± 1.1a
 Macropoint 50.8 ± 5.3b 39.5 ± 4.8b 43.8 ± 1.1b 45.5 ± 0.8b
Without pretreatment 25.0 ± 5.6a 82.2 ± 9.4a 75.2 ± 3.2c 36.3 ± 4.0a
  1. Equal lowercase letters do not differ from each other by the Tukey test on the column