Sidnei Sangali's research while affiliated with ICTA and other places
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Publications (3)
A feather protein hydrolysate was produced using the keratinolytic bacterium Vibrio sp. strain kr2. Complete feather degradation was observed in medium containing up to 60 g L(-1) raw feathers. Cultivation on 40, 60 or 80 g L(-1) feathers for five days resulted in similar amounts of soluble protein, reaching maximum values around 2.5 g L(-1). Maxim...
The aim of the study was to characterize feather-degrading bacteria isolated from poultry industry waste. A Vibrio sp. strain kr2 producing a high keratinolytic activity when cultured on native feather-containing broth was isolated. The bacterium grew with an optimum at pH 6.0 and 30 degrees C, where maximum featherdegrading activity was also obser...
Feather waste, generated in large quantities as a byproduct of commercial poultry processing, is almost pure keratin, which is not easily degradable by common proteolytic enzymes. Feather-degrading bacteria were isolated from a Brazilian poultry industrial waste. Among these isolates, a strain identified as kr2 was the best feather-degrading organi...
Citations
... There is much data on bacterial keratinases with a weak alkaline pH optimum in the range of 7.5-9.0 [55,[58][59][60][61]. Alkaline conditions enhance keratinolysis due to lanthionine formation by reducing the degree of binding of the keratin chains. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/1048710947536896-1627043582252_Q64/Adriano-Brandelli.jpg)
... However, keratinase-producing Gramnegative bacteria have also been reported, such as Vibrio sp. strain kr2, Citrobacter diversus, and Pseudomonas aeruginosa 4-3, but their application is limited because most of them carry a certain degree of pathogenicity (Sangali and Brandelli 2000;Pei et al. 2022;Duffeck et al. 2020). Fungi were the first microorganisms found to degrade keratin, most of which are dermatophytes, including Trichophyton, Microsporum, and Epidermophyton (Mercer et al. 2019), but these dermatophytes have little commercial application. ...
... However, it has been reported that glycerol inhibited keratinase production in other Bacillus species [50] or did not result in a significant increase of keratinase production [68]. It was reported that supplementation of glucose-suppressed keratinase production [19], however, in this study, glucose supported keratinase production of B. cereus HD1. On the other hand, supplementation of sucrose, and lactose inhibited the growth, feather degradation, and keratinase activity of B. cereus HD1. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/11431281082041944-1661952599413_Q64/Fernanda-Peres-3.jpg)
