Effect of washing, soaking and pH in combination with ultrasound on enzymatic rancidity, phytic acid, heavy metals and coliforms of rice bran.
Food Chem
; 334: 127583, 2021 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-32711273
ABSTRACT
Simultaneous reduction in activity of fat destabilizing enzymes (lipase and lipoxygenase), contaminants heavy metals (As, Cd, Pb, and Hg), antinutrient phytic acid and hazardous coliforms in rice bran was investigated. Application of washing, soaking the washed sample at different pH values (2, 6 and 9) alone or in combination with ultrasonication were examined. While washing was beneficial, its low efficiency acquired further treatment, which was prevailed by application of acidic pH and ultrasound (28 kHz) treatments. Free fatty acids and peroxide value, as indicators of enzymes activity, implied the effectiveness of treatments with adverse impact of sonication on peroxide value. Remarkably, reduction of dominant heavy metals (As, Pb and Zn) and phytic acid were synergistically facilitated by sonication. Coliforms growth was inhibited at pH 2 even at the absence of ultrasonic treatment. Evidently, combination of acidic pH and ultrasound is a practical approach to improve rice bran stability and safety.
Palavras-chave
Enzyme activity; Heavy metal; Hydrochloric acid (PubChem CID: 313); Hydrogen peroxide (PubChem CID: 784); Linoleic acid (PubChem CID: 5280450); Nitric acid (PubChem CID: 944); Phytic acid; Rice bran; Sodium hydroxide (PubChem CID: 14798); Soybean lipoxygenase (PubChem CID: 135321828); Toluene (PubChem CID: 1140); Triacetin (PubChem CID: 5541); Tween 20 (PubChem CID: 443314); Ultrasound; n-hexan (PubChem CID: 8058); pH
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ácido Fítico
/
Oryza
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Lipoxigenase
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Metais Pesados
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Análise de Alimentos
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Lipase
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article