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Přímé současné stanovení osmi náhradních sladidel v potravinách pomocí izotachoforézy
Authors: Herrmannová Michaela | Křivánková Ludmila | Bartoš Martin | Vytřas Karel
Year: 2006
Type of publication: článek v odborném periodiku
Name of source: Journal of Separation Science
Publisher name: Wiley-VCH
Place: Weinheim
Page from-to: 1132-1137
Titles:
Language Name Abstract Keywords
cze Přímé současné stanovení osmi náhradních sladidel v potravinách pomocí izotachoforézy Metoda isotachoforetického stanovení sladidel různého charakteru v bonbónech a žvýkačkách. Vedoucí elektrolyt: 10 mM HCl + 14 mM Tris (pH 7,7), koncový elektrolyt: 5 mM L-histidin + 5 mM Tris (pH 8,3). Do vodného roztoku vzorku je přidána kyselina boritá, která tvoří záporně nabité komplexy s látkami polyhydroxylové povahy. Stanoveny byly: acesulfam K, sacharin, aspartam, cyklamát, sorbitol, mannitol, laktitol a xylitol. Detekční limity se pohybovaly mezi 0,024 a 0,081 mmol/l. Isotachophoresis; Polyols; Sweeteners
eng Direct Simultaneous Determination of Eight Sweeteners in Foods by Capillary Isotachophoresis A method for isotachophoretic determination of sweeteners of different character in candies and chewing gums was developed. A capillary of 0.8 mm ID and 90 mm effective length made of fluorinated ethylene-propylene copolymer is filled with an electrolyte system consisting of 10 mM HCl + 14 mM Tris, pH 7.7 (leading electrolyte) and 5 mM L-histidine + 5 mM Tris, pH 8.3 (terminating electrolyte). The analysis is performed at a driving current of 200 lA and for detection current is decreased to 100 lA. Boric acid is added to the aqueous sample solution to form borate complexes with substances of polyhydroxyl nature and make them migrate isotachophoretically. Using conductivity detection, the calibration curves in the tested concentration range up to 2.5 mM were linear for all components of interest: acesulfame K, saccharine, aspartame, cyclamate, sorbitol, mannitol, lactitol, and xylitol. The concentration detection limits ranged between 0.024 and 0.081 mM. Good precision of the ITP method is evidenced by favorable RSD values ranging from 0.8 to 2.8% obtained at the analyte concentration of 1.0 mM (n = 6). The analysis time was about 20 min. Simplicity, accuracy, and low cost of analyses make ITP an alternative procedure to methods used so far for the determination of ionizable sweeteners. Isotachophoresis; Polyols; Sweeteners

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