Survey of caffeine levels in retail beverages in Portugal

Pena, Angelina; Lino, Celeste M.; Silveira, Maria Irene Noronha da

doi:10.1080/02652030500037886

Cited by 24 publications

(13 citation statements)

References 13 publications

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“…Caffeine content data of different food items investigated in the present study are comparable to those published by other authors (SHIVELY & TARKA, 1984;CAMARGO et al, 1999, CAUDLE et al, 2001MCCUSKER et al, 2003MCCUSKER et al, , 2006a2006b;PENA et al, 2005;CHOU & BELL, 2007;OLMOS et al, 2009;HECKMAN et al, 2010). These data show that there are some special caffeine sources like cakes, biscuits or cottage cheese based desserts containing cocoa or chocolate, but it is supposed that these foods do not contribute at a high level in the intake of caffeine.…”

Section: Discussionsupporting

confidence: 80%

Caffeine content of conventional and non conventional foods on the Hungarian market

Lugasi¹,

Kádár²,

Alb³

et al. 2015

Acta Alimentaria

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Section: Discussionsupporting

confidence: 80%

Caffeine content of conventional and non conventional foods on the Hungarian market

Lugasi¹,

Kádár²,

Alb³

et al. 2015

Acta Alimentaria

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“…Virtually everybody, sometimes unknowingly, is exposed to this chemical substance which is probably the most available and consumed drug (Pena et al 2005;Tzanavaras and Themelis 2007;McCusker et al 2003McCusker et al , 2006a.…”

Section: Introductionmentioning

confidence: 99%

Caffeine Content of Retail Market Coffee in Portugal

2008

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How much caffeine does one ingest when drinking a simple cup of coffee in Portugal? The study presented herein tried to answer this question through the assessment of caffeine content of commercially available espresso coffee samples, both caffeinated and decaffeinated, using a high-performance liquid chromatography assay. Caffeine was rapidly separated from the sample matrix using a RP-18 column (250×4 mm i.d., 5 μm). The flow rate was 1.0 mL/min and the mobile phase consisted of water acidified with 5% of orthophosphoric acid/methanol (35:65, v/v). Caffeine was detected directly at 273 nm. The assay was validated for linearity, lower limit of quantification and limit of detection, precision, accuracy, and stability. Seventeen different brands of caffeinated coffee and six of decaffeinated coffee were analyzed. As for capsule coffee, eight caffeinated and two decaffeinated blends were analyzed. The caffeine content of caffeinated coffee varied from 53.8 ± 5.9 to 141.3 ± 5.3 mg/cup, whereas for caffeinated capsule coffee caffeine concentrations ranged from 45.0±5.3 to 60.8±6.2 mg/cup. As for decaffeinated coffee, caffeine concentrations ranged from 0.96 ± 0.04 to 3.9 ± 0.1 mg/cup and for decaffeinated capsule coffee from 0.93±0.04 to 1.2±0.1 mg/cup.

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“…They have both an acidic and basic functional groups that can interact with either hydrophilic or lipophilic portion, of the Oasis HLB adsorbent [24].…”

Section: Optimization Of Extraction and Clean-upmentioning

confidence: 99%

Determination of fluoroquinolone antibiotics in hospital and municipal wastewaters in Coimbra by liquid chromatography with a monolithic column and fluorescence detection

et al. 2008

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The main goal of this work was determination of residues of the antibiotics ofloxacin (OFLO), norfloxacin (NOR), ciprofloxacin (CIPRO), and enrofloxacin (ENRO) in wastewater samples. The samples, after acidification to pH 4.5 and addition of EDTA, were extracted on an anion-exchange cartridge in tandem with an Oasis HLB cartridge. The LC-FD method, developed in previous studies, was based on application of a monolithic C 18 column. for ENRO. Mean recovery ranged between 75 and 121% for OFLO, NOR, CIPRO, and ENRO. A total of 14 wastewater samples were analyzed; these were collected from four hospitals and from influent and effluent from a wastewatertreatment plant in Coimbra, Portugal, during spring and autumn. CIPRO was present in all the samples, NOR was detected second most often, followed by OFLO. ENRO was found at concentrations under the LOQ in five hospital samples, and the highest level was found in influent from the WWTP.

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Survey of caffeine levels in retail beverages in Portugal

Cited by 24 publications

References 13 publications

Caffeine content of conventional and non conventional foods on the Hungarian market

Caffeine content of conventional and non conventional foods on the Hungarian market

Caffeine Content of Retail Market Coffee in Portugal

Determination of fluoroquinolone antibiotics in hospital and municipal wastewaters in Coimbra by liquid chromatography with a monolithic column and fluorescence detection

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