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Application Formaldehyde

Formaldehyde is used for disinfection but is also carcinogenic, so formaldehyde donors are used instead to maintain low free formaldehyde concentrations. Determining free formaldehyde is difficult due to its chemistry and detection challenges. Post-column derivatization separates donor and formaldehyde before derivatizing to a fluorescent product, avoiding equilibrium issues. The document describes a method using Pinnacle PCX for post-column derivatization of formaldehyde in samples using acetyl acetone to form a fluorescent derivative detected at 412/510 nm.

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PaoloMM
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57 views3 pages

Application Formaldehyde

Formaldehyde is used for disinfection but is also carcinogenic, so formaldehyde donors are used instead to maintain low free formaldehyde concentrations. Determining free formaldehyde is difficult due to its chemistry and detection challenges. Post-column derivatization separates donor and formaldehyde before derivatizing to a fluorescent product, avoiding equilibrium issues. The document describes a method using Pinnacle PCX for post-column derivatization of formaldehyde in samples using acetyl acetone to form a fluorescent derivative detected at 412/510 nm.

Uploaded by

PaoloMM
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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APPLICATION NOTE

As of: April, 2010

FORMALDEHYDE
Formaldehyde is used for the disinfection of
industrially manufactured products. However, it is det-
rimental to health and its potential carcinogenicity led
to the current utilization of formaldehyde donors for
microbiological long-term stabilization, which are in
hydrolytic equilibrium with formaldehyde. Thereby, the
concentration of free formaldehyde is kept as low as
possible.
The quantitative determination of free formaldehyde
seems quite problematic. Firstly, the detection charac-
teristics of formaldehyde are very unfavorable. Con-
sequently, derivatization is necessary in order to
achieve the required sensitivity. Secondly, the hydro-
lytic equilibrium between donor and free formaldehyde
can change quite quickly, which makes the prepara-
tion of samples more difficult and/or influences the
correctness of analytical results.
An elegant solution for this problem is, therefore, to
perform the derivatization step after separation on an
HPLC column, because the equilibrium cannot be in-
fluenced when donor and free formaldehyde are
chromatographically separated before derivatization. PICKERING offers the complete post-column
derivatization system PINNACLE PCX for the detection of traces of formaldehyde. The user, how-
ever, has to supply columns, eluents, reagents, etc..

Description of the Method


The derivatization of formaldehyde is performed in a one-step reaction using acetyl acetone
(2,4-pentanedione). In the presence of an ammonium salt, it reacts to a yellow, strongly fluorescing
3,5-diacetyl-1,4-dihydrolutidine derivative. The detection is performed with either a UV/VIS or fluo-
rescence detector.

LCTech GmbH I P.O. Box 1360 I 84403 Dorfen, Germany Seite 1 von 3
Tel: +49-(0)8081-9368-0 I Fax: +49-(0)8081-9368-10 I www.Lctech.de I info@Lctech.de
APPLICATION NOTE

HPLC Conditions and Derivatization Parameters

HPLC

Operating Mode Isocratic

Eluent Acetonitril:Water (85:15)

Degassing Helium- or vacuum degassed

HPLC Column RP C18

Column Oven 40 °C

Flow Rate 0.5 mL/min

Post-column Derivatization

Pinnacle PCX Single-pump

Reactor volume 500 µL

Reactor temperature 100 °C

Reagents 0.81 M Ammonimn acetate /


0.12 M Galicial acetic acid (pH=5)/
0.05 M 2,4-Pentanedione with water

Reagent Flow 0,4 mL/min

Detection

Detection Mode Fluorescence detection

Excitation Wavelength 412 nm

Emission Wavelength 510 nm

Flowcell Analytic; pressure stable up to 7 bar

LCTech GmbH I P.O. Box 1360 I 84403 Dorfen, Germany Seite 2 von 3
Tel: +49-(0)8081-9368-0 I Fax: +49-(0)8081-9368-10 I www.Lctech.de I info@Lctech.de
APPLICATION NOTE

Chromatogram
Chromatogram of a shampoo sample

Sample spiked with 0,05% formaldehyde. Determination according to K 84.00-7(EG)

Literature
1) J. Meister, H. Engelhardt, LaborPraxis 1995, 7, 28 – 31.
2) Amtliche Sammlung §64 LFGB, K 84.00-7(EG), September 1991.

Order Information

Order Number Description

1153-1022 PINNACLE PCX – single-pump; 500 µL reactor

LCTech GmbH I P.O. Box 1360 I 84403 Dorfen, Germany Seite 3 von 3
Tel: +49-(0)8081-9368-0 I Fax: +49-(0)8081-9368-10 I www.Lctech.de I info@Lctech.de

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