Detection of coffee adulteration with soybean and corn by capillary electrophoresis-tandem mass spectrometry.
Food Chem
; 243: 305-310, 2018 Mar 15.
Article
en En
| MEDLINE
| ID: mdl-29146342
The detection of coffee adulteration with soybean and corn by capillary electrophoresis-tandem mass spectrometry was accomplished by evaluating the monosaccharides profile obtained after acid hydrolysis of the samples. The acid hydrolysis, using H2SO4 as a catalyst, increases the ionic strength of the sample impairing the electrophoretic separation. Therefore, Ba(OH)2 was used to both neutralize the medium and reduce the content of sulfate by precipitation of BaSO4. The best separation of nine determined monosaccharides (fucose, galactose, arabinose, glucose, rhamnose, xylose, mannose, fructose and ribose) plus inositol as internal standard was obtained in 500â¯mmol·L-1 triethylamine, pH 12.3. The monosaccharides are separated as anionic species at this pH. The proposed method is simple, fast (<12.0â¯min), present linear calibration curves (r2â¯=â¯0.995), and relative standard deviation for replicate injections lower than 5%. The LOQ for all monosaccharides was lower than 0.01â¯mmol·L-1, which is in accordance with the tolerable limits for coffee. Principal component analysis (PCA) was used to evaluate interrelationships between the monosaccharide profile and the coffee adulteration with different proportions of soybean and corn. Fucose, galactose, arabinose, glucose, sucrose, rhamnose, xylose, mannose, fructose, and ribose were quantified in packed roast-and-ground commercial coffee samples, and differences between adulterated and unadulterated coffees could be detected.
Palabras clave
Arabinose (PubChem CID: 66308); Capillary electrophoresis; Coffee adulteration; Corn; Electrospray; Fructose (PubChem CID: 5984); Fucose (PubChem CID: 17106); Galactose (PubChem CID: 439357); Glucose (PubChem CID: 79025); Inositol (PubChem CID: 892); Mannose (PubChem CID: 18950); Mass spectrometry; Monosaccharide; Rhamnose (PubChem CID: 25310); Ribose (PubChem CID: 10975657); Soybean; Xylose (PubChem CID: 644160)
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminación de Alimentos
/
Café
/
Electroforesis Capilar
/
Espectrometría de Masas en Tándem
/
Análisis de los Alimentos
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Food Chem
Año:
2018
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Reino Unido