Step Two: Dispersive SPE Clean-Up
Select the Dispersive SPE kit suited to the type of food being analyzed and the method you are following. In this step, an aliquot of the sample extract from Step One is added to 2 mL or 15 mL centrifuge tube containing a small amount of SPE sorbent and MgSO4. The sorbent will pull out intefering matrix materials from the sample, and the MgSO4 helps remove excess water and improve analyte partitioning
Suggested Dispersive Kits by Food Type and Method
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Dispersive SPE Kits |
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Kit |
Quantity & Size/Pack |
AOAC 2007.01 Method |
European Method EN 15662 |
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Contents & Part No. |
Contents & Part No. |
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General Fruits and Vegetables: Removes polar organic acids, some sugars and lipids |
100 – 2 mL tubes |
50 mg PSA 150 mg MgSO4 Part No. 5982-5022 |
25 mg PSA 150 mg MgSO4 Part No. 5982-5021 |
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50 – 15 mL tubes |
400 mg PSA 1200 mg MgSO4 Part No. 5982-5058 |
150 mg PSA 900 mg MgSO4 Part No. 5982-5056 |
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Fruits and Vegetables with Fats and Waxes: Removes polar organic acids, some sugars, more lipids and sterols |
100 – 2 mL tubes |
50 mg PSA 50 mg C18EC 150 mg MgSO4 Part No. 5982-5122 |
25 mg PSA 25 mg C18EC 150 mg MgSO4 Part No. 5982-5121 |
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50 – 15 mL tubes |
400 mg PSA 400 mg C18EC 1200 mg MgSO4 Part No. 5982-5158 |
150 mg PSA 150 mg C18EC 900 mg MgSO4 Part No. 5982-5156 |
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Pigmented Fruits and Vegetables: Removes polar organic acids, some sugars and lipids, and carotinoides and chlorophyll; not for use with planar pesticides |
100 – 2 mL tubes |
50 mg PSA 50 mg GCB 150 mg MgSO4 Part No. 5982-5222 |
25 mg PSA 2.5 mg GCB 150 mg MgSO4 Part No. 5982-5221 |
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50 – 15 mL tubes |
400 mg PSA 400 mg GCB 1200 mg MgSO4 Part No. 5982-5258 |
150 mg PSA 15 mg GCB 900 mg MgSO4 Part No. 5982-5256 |
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Highly Pigmented Fruits and Vegetables: Removes polar organic acids, some sugars and lipids, plus high levels of carotinoides and chlorophyll; not for use with planar pesticides |
100 – 2 mL tubes |
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25 mg PSA 7.5 mg GCB 150 mg MgSO4 Part No. 5982-5321 |
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50 – 15 mL tubes |
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150 mg PSA 45 mg GCB 900 mg MgSO4 Part No. 5982-5356 |
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Fruits and Vegetables with Pigments and Fats: Removes polar organic acids, some sugars and lipids, plus carotinoides and chlorophyll; not for use with planar pesticides |
100 – 2 mL tubes |
50 mg PSA 50 mg GCB 150 mg MgSO4 50 mg C18EC Part No. 5982-5421 |
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50 – 15 mL tubes |
400 mg PSA 400 mg GCB 1200 mg MgSO4 400 mg C18EC Part No. 5982-5456 |
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PSA = Primary Secondary Amine; GCB = Graphitized Carbon Black; C18EC = Octadecysilane, end-capped (For this step, the AOAC method specifies 1 mL or 6 mL aliquot samples; the EN method recommends 1 mL or 8 mL aliquot samples. Kits are assembled based on these specifications). |
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