EN 16618:2015

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lebensmittelanalytik - Bestimmung von Acrylamid in Lebensmitteln mit Flüssigkeitschromatographie und Tandem-Massenspektrometrie (LC-ESI-MS/MS)Analyse des produits alimentaires - Dosage de l'acrylamide dans les produits alimentaires par chromatographie en phase liquide couplée à la spectrométrie de masse en tandem (CL-ESI-SM-SM)Food analysis - Determination of acrylamide in food by liquid chromatography tandem mass spectrometry (LC-ESI-MS/MS)67.050Splošne preskusne in analizne metode za živilske proizvodeGeneral methods of tests and analysis for food productsICS:Ta slovenski standard je istoveten z:EN 16618:2015SIST EN 16618:2015en,fr,de01-julij-2015SIST EN 16618:2015SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16618
April 2015 ICS 67.050; 67.060; 67.080.20; 67.140.20 English Version
Food analysis - Determination of acrylamide in food by liquid chromatography tandem mass spectrometry (LC-ESI-MS/MS)
Analyse des produits alimentaires - Dosage de l'acrylamide dans les produits alimentaires par chromatographie en phase liquide couplée à la spectrométrie de masse en tandem (CL-ESI-SM-SM)
Lebensmittelanalytik - Bestimmung von Acrylamid in Lebensmitteln mit Flüssigchromatographie und Tandem-Massenspektrometrie (LC-ESI-MS/MS) This European Standard was approved by CEN on 7 February 2015.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
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Typical chromatograms . 18 Annex B (informative)
Precision data . 20 Bibliography . 24
Figure 1 — Acrylamide WARNING — Acrylamide has been classified by the International Agency for Research on Cancer (IARC) as probably carcinogenic to humans. Protective equipment as laboratory coat, disposable gloves and safety glasses shall be used. All handlings of acrylamide and organic solvents shall be performed in a fume cupboard with adequate air flow. 4.2 Deuterium-labelled acrylamide – acrylamide-2,3,3-D3 (CAS 122775-19-3). The chemical structure is:
Figure 2 — Deuterium-labelled acrylamide Alternatively, 13C-labelled acrylamide (acrylamide-13C3, CAS 287399-26-2) may be used. 4.3 Methanol (CAS 67-56-1). 4.4 Glacial acetic acid (CAS 64-19-7). 4.5 n-Hexane (CAS 110-54-3). Alternatively, cyclohexane (CAS 110-82-7) may be used. 4.6 Eluent for SPE column 2 (5.2.3) Mix 60 parts per volume of methanol (4.3) with 40 parts per volume of water. 4.7 HPLC mobile phase Mix 1 part per volume of glacial acetic acid (4.4) with 1 000 parts per volume of water. 4.8 Stock solutions of acrylamide and acrylamide-2,3,3-D3, mass concentration
= 1 000
Weigh, to the nearest 0,05 mg, approximately 100 mg of acrylamide and acrylamide-2,3,3-D3 respectively into separate 100 ml volumetric flasks, dissolve in water and dilute to 100 ml. Solutions can be stored at 4 °C for at least 3 months. 4.9 Internal standard solution 1,
= 10
Transfer 1 000 -2,3,3-D3 (4.8) to a 100 ml volumetric flask and dilute to the mark with water. SIST EN 16618:2015

= 1 000 ng/ml. Transfer 5 000
internal standard solution 1 (4.9) to a 50 ml volumetric flask and dilute to the mark with water. 4.11 Acrylamide standard solution 1,
= 100
Transfer 5 000 4.8) to a 50 ml volumetric flask and dilute to the mark with water. 4.12 Acrylamide standard solution 2,
= 10
Transfer 5 000
1 (4.11) to a 50 ml volumetric flask and dilute to the mark with water. 4.13 Acrylamide standard solution 3,
= 100 ng/ml. Transfer 1 000
2 (4.12) to a 100 ml volumetric flask and dilute to the mark with water. 4.14 LC-MS calibration solutions Dilute aliquots from standard solutions (4.9), (4.11), (4.12) and (4.13) with water to give calibration solutions of e.g. 0 ng/ml, 5 ng/ml, 10 ng/ml, 20 ng/ml, 50 ng/ml, 100 ng/ml, 250 ng/ml, 500 ng/ml, 1 000 ng/ml, 2 000 ng/ml, 5 000 ng/ml and 10 000 ng/ml respectively of acrylamide, all containing 400 ng/ml of acrylamide-2,3,3-D3. Examples for the preparation of calibration solutions are given in Table 1. Table 2 indicates the relation between calibration solution concentrations and acrylamide contents of food samples. Calibration shall be performed on at least six concentration levels distributed properly over the working range. The analysis of an even higher number of calibration solutions should be analysed if such a broad range of concentrations (0
Table 1 — Preparation of LC-MS calibration solutions Calibration solution ng/ml Volumetric flask ml Internal standard solution (4.9)
Acrylamide standard solution
0 100 4 000 0 5 100 4 000 5 000 of (4.13) 10 100 4 000 10 000 of (4.13) 20 100 4 000 200 of (4.12) 50 100 4 000 500 of (4.12) 100 100 4 000 1 000 of (4.12) 250 100 4 000 2 500 of (4.12) 500 100 4 000 5 000 of (4.12) 1 000 100 4 000 1 000 of (4.11) 2 000 100 4 000 2 000 of (4.11) 5 000 100 4 000 5 000 of (4.11) 10 000 50 4 000 5 000 of (4.11) SIST EN 16618:2015

Roasted coffee
10 10 50 5 Apparatus Usual laboratory glassware and equipment and, in particular, the following: 5.1 LC-MS/MS system 5.1.1 HPLC apparatus, comprising the following: 5.1.1.1 Thermostated column compartment. 5.1.1.2 Injection system, capable of injecting 10
5.1.1.3 Mobile phase pump, capable of maintaining a mobile phase flow of 0,4 ml/min. 5.1.2 HPLC column The stationary phase of the column is graphitized carbon1a), particle size 5
mm x 2,1 mm with a guard column1a), particle size 5
mm x 2 mm. Alternative columns/stationary phases may be applied provided that similar performance to the graphitized carbon column can be demonstrated. 5.1.3 Mass spectrometer Triple quadrupole mass spectrometer operating in positive electrospray and, selected reaction monitoring mode (SRM), set to obtain unit resolution. 5.1.4 Data acquisition and analysis system Suitable data collection and evaluation software. 5.1.5 Divert valve (optional) HPLC valve installed between HPLC column and mass spectrometer in order to direct the HPLC effluent either to waste or to the mass spectrometer, see 7.1.1. 5.2 Solid phase extraction system 5.2.1 Vacuum manifold for solid phase extraction
1) a) Hypercarb™ column, Thermo Hypersil-Keystone® column, b) ISOLUTE ® Multimode SPE column and c) ISOLUTE ® ENV+ SPE column from Biotage® are examples of suitable products available commercially. This information is given for the convenience of users of this European Standard and does not constitute an endorsement by CEN of these products. Equivalent products may be used if they can be shown to lead to the same results. SIST EN 16618:2015

5.6 Centrifuge tubes, volume of 50 ml, polypropylene, disposable. 5.7 Mechanical shaker, e.g. wrist arm shaker, allowing well mixing of different phases, capable of holding 50 ml centrifuge tubes. 5.8 Vortex mixer. 5.9 Cooled centrifuge, capable of a centrifugal force of 3 600 g for 50 ml centrifuge tubes. 5.10 Volumetric flasks, volume of 50 ml, 100 ml, etc. according to EN ISO 1042:1999. 5.11 Glass vials, volume of at least 4 ml, suitable for the evaporation equipment. 5.12 Amber glass autosampler vials, suitable for the HPLC autosampler. 5.13 Evaporation equipment, based on vacuum or a stream of inert gas. The evaporation temperature shall not exceed 40 °C. 6 Sample preparation 6.1 General Residues of acrylamide have sometimes been found in laboratory ware as e.g. filters. Make sure the laboratory ware does not contain any measureable amounts of acrylamide, and include procedural blank samples as controls in each series of samples. Acrylamide has been found to be formed as an artefact in some analytical procedures for acrylamide, e.g. during extraction or in the injection port of GC instruments. Even if this is not a problem for HPLC analysis, make sure to never exceed 40 °C during extraction or the work-up process. It has been proven that acrylamide is efficiently extracted from various types of food by shaking with water if the particles of the samples are small enough. Make sure that the particles are < 1 mm before extraction and use, if necessary, a mechanical device for preparation of homogenous slurry2).
2) Ultra Turrax® and Waring blender® are examples of suitable products available commercially. This information is given for the convenience of the users of this European Standard and does not constitute an endorsement by CEN of these products. Equivalent products may be used if they can be shown to lead to the same results. SIST EN 16618:2015

2, c = 1 000 ng/ml (4.10). Shake intensively for 15 s to 30 s by hand and 10 s to 15 s with a vortex mixer (5.8), and then for 60 min on a mechanical shaker (5.7) adjusted to maximum sample-extractant agitation. Centrifuge in a cooled centrifuge (5.9) at 10 °C, 3 600 x g for 20 min and take off 10 ml of the aqueous phase to a clean test tube. Avoid to transfer parts of the fat layer that will be formed and found on the top, depending of the fat content of the sample. Take care that a homogenous slurry is formed and that the whole sample is in contact with the extractant. If the described procedure is for any reason not sufficient to produce a homogenous slurry, additional mechanical forces shall be applied by e.g. application of a device for preparation of homogenous slurry. 6.2.2 Extraction procedure for coffee samples Weigh, to the nearest 0,01 g, a 2,0 g test portion into a 50 ml centrifuge tube (5.6). Add 5 ml of n-hexane (alternatively cyclohexane). Add 40 ml of water. Add 400
2, c = 1 000 ng/ml (4.10). Shake intensively for 15 s to 30 s by hand and 10 s to 15 s with a vortex mixer (5.8), and then for 60 min on a mechanical shaker (5.7), adjusted to maximum sample-extractant agitation. Centrifuge in a cooled centrifuge (5.9) at 10 °C, 3 600 x g for 20 min. Check for proper phase separation of n-hexane (or cyclohexane), aqueous and solid phase. Remove and discard the organic solvent phase (n-hexane or cyclohexane), and transfer 10 ml of the aqueous phase to a clean test tube. Take care that a homogenous slurry is formed and that the whole sample is in contact with the extractant. If the described procedure is for any reason not sufficient to produce a homogenous slurry, additional mechanical forces shall be applied by, e.g. application of a device for preparation of homogenous slurry. NOTE Cyclohexane is a suitable alternative for n-hexane. 6.3 Cleanup 6.3.1 Cleanup for bakery and potato product sample For all steps adjust the flow of the SPE columns to let the liquid elute drop wise (about 30 drops per min). Check the completeness of elution of acrylamide from the SPE column 2 (5.2.3) by recording the elution profile, at least for each new batch of columns. Fit SPE column 1 (5.2.2) to the vacuum manifold (5.2.1). Condition the column with 3 ml of methanol and 2 times with 6 ml of water. Pass 10 ml of the aqueous extract (6.2.1) through the column and collect the eluate. Fit SPE column 2 (5.2.3) to the vacuum manifold (5.2.1). Condition the column with 5 ml of methanol and 5 ml of water. Load the extract (approximately 10 ml) from the previous column and discard the eluate. Rinse the column once with 4 ml of water and discard the rinsing solvent. Assure that no eluate is left in the valves or flow channels of the vacuum manifold by e.g. placing the column on another (dry) position of the vacuum manifold. Rinsing solvent that is left in the valves could contain co-extracts that could interfere with the internal standard peak. After rinsing, elute acrylamide with 2 ml of 60 % methanol in water (4.6). Collect the elution SIST EN 16618:2015
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