Physical relation and mechanism of ultrasonic bactericidal activity on pathogenic E. coli with WPI.
Microb Pathog
; 117: 73-79, 2018 Apr.
Article
em En
| MEDLINE
| ID: mdl-29428425
ABSTRACT
OBJECTIVE:
This study aimed to investigate the physical relation and mechanism of bactericidal activity on pathogenic E. coli by ultrasonic field with whey protein isolate (WPI).METHODS:
Ultrasound treatment was performed under the conditions of intensity at 65â¯W/cm2, pulse duty ratio at 0.5 for 0-15â¯min with WPI concentration ranged from 0 to 10%. Viscosity, granularity, surface hydrophobicity, free radical scavenging activity, and thermal denaturation were assessed by rotational viscometer, Malvern Mastersizer 2000 particle size analyzer, fluorescent probe ANS method, DPPH method, and differential scanning calorimetry, respectively.RESULTS:
The thermal denaturation of WPI was not altered by ultrasound field, but the viscosity of WPI was increased upon 10â¯min treatment. Additionally, its ability to scavenge free radicals and hydrophobicity were increased. The result also showed that the bacteria viability was improved by WPI during ultrasound treatment. However, the WPI protection was decreased by the prolonged treatment.CONCLUSION:
Ultrasound treatment resulted in the increasing of the viscosity, free radicals scavenging activity and hydrophobicity of WPI which led to reduced bactericidal activity on E. coil, while WPI protection was disintegrated by prolonged treatment.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ultrassom
/
Escherichia coli
/
Proteínas do Soro do Leite
Idioma:
En
Revista:
Microb Pathog
Assunto da revista:
DOENCAS TRANSMISSIVEIS
/
MICROBIOLOGIA
Ano de publicação:
2018
Tipo de documento:
Article
País de publicação:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM