Content of 4(5)-methylimidazole, caffeine and chlorogenic acid in commercial coffee brands

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F15%3A00083015" target="_blank" >RIV/00216224:14310/15:00083015 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.5219/422" target="_blank" >http://dx.doi.org/10.5219/422</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5219/422" target="_blank" >10.5219/422</a>

Result language

angličtina

Original language name

Content of 4(5)-methylimidazole, caffeine and chlorogenic acid in commercial coffee brands

Original language description

Content of 4(5)-methylimidazole(4-MeI), caffeine and chlorogenic acid in commercial coffee brands were determined using high-performance liquid chromatography (HPLC) with UV DAD and MS detectors. Positive ion ESI mass spectra of the 4-MeI standard yielded intense signals corresponding to [M+H]+(83.0604) and [2M+H]+ions (165.1115). Also, adducts of 4-MeI with acetonitrile from mobile were detected ?[M+ACN]+ions (124.0849). The LOD of 2.5 ng mL-1and LOQ of 8.4 ng.mL-1 were calculated according to the following formulas: LOD = 3.SD/S, and LOQ = 10.SD/S, where S is the slope of the calibration curve and SD is the standard deviation of the noise. The caffeine content was compared to the results of the standard addition, 1stderivative and liquid-liquid extraction spectrophotometry. 4-MeI was in tens mikrog g-1 in the Vietnamese coffees while in units mikrog.g-1in all Czech and Brazilian coffees (&lt;2.4 mikrog.g-1 and &lt;4.9 mikrog.g-1 , respectively).

Czech name

—

Czech description

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CB - Analytical chemistry, separation

OECD FORD branch

—

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Potravinárstvo

ISSN

1337-0960

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

1

Country of publishing house

SK - SLOVAKIA

Number of pages

8

Pages from-to

31-38

UT code for WoS article

—

EID of the result in the Scopus database

—