EVEN QUICKER,CHEAPER AND SAFER GERMAN-MADE FOR YOUR MULTIPLE METHODS

Transcription

1 EVEN QUICKER,CHEAPER AND SAFER GERMAN-MADE FOR YOUR MULTIPLE METHODS

2 THE PROCESS AND ITS VARIANTS The QuEChERS method, which concerns the analysis of pesticides and other organic contaminants in foodstuffs and feed, has now become indispensable in laboratories. Going beyond the usual application of preparing the sample to determine pesticide residue in fruits and vegetables, this method has now become mainstream for an entire series of additional matrices and multiple residue analysis of additional analyte classes as well. offers you unmatched, low-cost, premium quality standard kits and sorbents, which make your everyday work easier and save time. First, the homogenized samples are extracted with acetonitrile and salts. Afterwards, the supernatant organic phase is cleaned using the dispersive SPE technique. Four methods have become established: The original method with 10 or 15 g of sample material, the methods with 10 g as per EN and the AOAC methods with 15 g of sample material. We offer pre-assembled kits for all of these methods, both for and for the subsequent cleaning step with dispersive SPE. Homogenized sample, 10 or 15 g Add 10 or 15 ml acetonitrile Add internal standard Shake vigorously Add kit (according to the method used) BENEFITS OF : Thanks to consistent high quality and the best prices over the years, QuEChERS Kits have established themselves as one of the most used brands in Germany. Precise sample weighing and strictly-inspected materials ensure high reproducibility salts are exceptionally pourable; the tubes can be easily opened and completely emptied by hand The color-coded screw caps of the 15-mL centrifuge tubes minimize the danger of confusing various PSA mixtures The 2-mL tubes are printed with the product name to clearly distinguish the different kits Tailor-made special fillings are possible at any time even in small batches Support in application development Original method, non-buffered, 10 g sample General samples with low fat content Color samples Original method, non-buffered, 15 g sample AOAC method, buffered, 15 g sample EN method, buffered, 10 g sample Shake vigorously for one minute Centrifuge Remove aliquot from the upper acetonitrile phase Pour 1, 6 or 8 ml aliquot to the selected, dispersive SPE kit. AOAC methods Problem with high fat or wax content Color samples with fats and wax 2 and 15 ml-kits General samples with low fat content Color samples EN15662 methods Problem with high fat or wax content Strong color samples Shake vigorously for 30 sec. Centrifuge Check the sample in an autosampler vial (add 10 µl 5% HCOOH in ACN per ml of sample solution to protect base-sensitive analytes) Analysis: GC-MS/MS or LC-MS/MS

3 QuEChERS EXTRACTION... THE FIRST STEP. Select the right kit (original method 10/ 15 g sample, EN or AOAC) for your desired method. Buffered salt kits are particularly useful for sensitive analytes such as ph-sensitive pesticides. salt mixtures are pre-filled in test tubes by default, and can be easily opened and fully emptied. Over the past several years, this has proven its worth in practice compared to the salt mixtures filled in bags. You may order all the salt kits with the matching 50 ml centrifugal tube or without them, if you wish for other centrifuge tubes. 1. Weigh the 10 g homogenized (frozen) sample in a 50-mL centrifuge pipe. Kit Content Pcs/PK Salt-Kit-AC 4 g MgSO 4 1 g NaCl Part number without 50 ml centrifuge tubes Part number with 50 ml centrifuge tubes 50 SK-AC-050 SK-AC Method Original (10 g sample) and acrylamide (5 g) Add 10 ml acetonitrile 2. and IS, if necessary 3. Shake vigorously for 1 min. Citrate-Kit-01 4 g MgSO 4 1 g NaCl 1 g Sodium citrate 0.5 g Sodium citrate sesquihydrate 50 CK CK-01 EN Salt-Kit-AC2 Salt-Kit-AC3 6 g MgSO g Sodium acetate 6 g MgSO g NaCl 50 SK-AC2-050 SK-AC2 AOAC 50 SK-AC3-050 SK-AC3 Original 15 g sample Ready-to-use add BEKOlut 4. salt to the sample mixture 3. Shake vigorously for 1 min. Centrifuge for 6. 5 min. at 3000 U/min 7. Extract after the centrifuge process

4 QuEChERS DISPERSIVE SPE CLEANING... THE SECOND STEP. To clean the organic extracts, select the appropriate dispersive SPE kit depending on the method and matrix. An aliquot of the extract from the first step is provided in a 2-mL or 15-mL centrifuge tube, which contains the QuEChERS components for removing interfering matrix components and binding the available water. The PSA-Kits (including 2 or 15-mL centrifuge tubes) are pre-filled with PSA (primary secondary amine) for removing saccharides and fatty acids, with magnesium sulfate for binding water and/or C18e for removing residual lipids and/or GCB (graphitized carbon black) for removing color pigments and are therefore suitable for direct use. Aliquot the supernatant in a BEKOlut 8. tube filled with sorbents for dispersive clean-up Do you use special mixtures? We already maintain a long list with special fillings; we will also be more than happy to fill your quantity and sorbents of your choice. The 15-mL centrifuge tubes of the dispersive SPE kits are intended for safe differentiation with color-coded covers, which uniquely identify 2 ml centrifuge tubes with a special print. 9. Shake vigorously for 30 sec. Centrifuge for min. at 3000 U/min Pipette the clear extract in 11. a vial after the centrifuge process and adjust the ph to 5 using 5% formic acid in acetonitrile (approx. 10 µl/ml extract). This extract is suitable for both the LC and GC analysis.

5 DSPE KITS RECOMMENDED DISPERSIVE ACCORDING TO FOOD GROUPS EN MATRIX AOAC 2 ml - PSA-KIT mg PSA, 100 pcs., Part no.: PK ml - PSA-KIT mg PSA, 900 mg MgSO 4 50 pcs., Part no.: PK-02 2 ml PSA-KIT mg PSA, 25 mg C18e, 100 pcs., Part no.: PK ml PSA-KIT mg PSA, 150 mg C18e, 900 mg MgSO 4 50 pcs., Part no.: PK-04 2 ml PSA-KIT mg PSA, 2.5 mg GCB, 100 pcs., Part no.: PK ml PSA-KIT mg PSA, 15 mg GCB, 900 mg MgSO 4 50 pcs., Part no.: PK-06 General samples (with low fat content) Problem with high fat & wax content Color samples 2 ml - PSA-KIT-01A 50 mg PSA, 100 pcs., Part no.: PK-01A 15 ml - PSA-KIT-02A 400 mg PSA, 1200 mg MgSO 4 50 pcs., Part no.: PK-02A 2 ml PSA-KIT-03A 50 mg PSA, 50 mg C18e, 100 pcs., Part no.: PK-03A 15 ml PSA-KIT-04A 400 mg PSA, 400 mg C18e, 1200 mg MgSO 4 50 pcs., Part no.: PK-04A 2 ml PSA-KIT-05A 50 mg PSA, 50 mg GCB, 100 pcs., Part no.: PK-05A 15 ml PSA-KIT-06A 400 mg PSA, 400 mg GCB, 1200 mg MgSO 4 50 pcs., Part no.: PK-06A Strong color samples color samples with fats & wax 2 ml PSA-KIT mg PSA, 7.5 mg GCB, 100 pcs., Part no.: PK ml PSA-KIT mg PSA, 45 mg GCB, 900 mg MgSO 4 50 pcs., Part no.: PK-08 2 ml PSA-KIT-07A 50 mg PSA, 50 mg C18e, 50 mg GCB,, 100 pcs., Part no.: PK-07A 15 ml PSA-KIT-08A 400 mg PSA, 400 mg C18e, 400 mg GCB, 1200 mg MgSO 4 50 pcs., Part no.: PK-08A Product group Sample material Typical water content g/100 g Citrus fruits Pome fruit Stone fruit Small & soft fruits Other fruits g/10 g sample g/5 g sample QuEChERS PSA-Kits Fruits EN AOAC Citrus juices 90 Grapefruit 90 Lemon/lime [1] 85 A Orange 85 A Orange peel Mandarin 90 Apple 85 Apple, dried Applesauce 80 Apple juice 90 Pear 85 Quince 85 Apricot 85 Apricot, dried Apricot nectar 85 Cherry 85 Mirabelle 80 Nectarine 85 Peach 90 Peach, dried Plum 85 Plum, dried Blackberry 85 Blueberry 85 Currant [1] 85 Elderberry 80 A Gooseberry 90 PSA-Kit-07 Grape 80 Raspberry [2] 85 Raisin Strawberry 90 Pineapple 85 Bananas Fig, dried Kiwi 85 Mango 80 PSA-Kit-07 Papaya 90

6 Product group Sample material Typical water content g/100 g Root & tuber vegetables Leek vegetable Fructo vegetables Wild cabbage Leaf vegetables & herbs g/10 g sample g/5 g sample QuEChERS PSA-Kits Vegetables EN AOAC Beets 90 Carrots 90 Celeriac 90 Horseradish Parsley root 90 Radish 95 Black salsify 80 Potato 80 Garlic 60 7 Onion 90 Leek 85 Shallot 80 Chives 85 A PSA-Kit-07 Eggplant 90 Pickle 95 Melon 90 Paprika 90 A Pumpkin 95 PSA-Kit-07 Tomato 95 Zucchini 95 Broccoli 90 Brussel sprouts 85 Cauliflower 90 Chinese cabbage 95 Kohlrabi 90 Cabbage 90 A Red cabbage 90 Savoy cabbage 90 White cabbage 90 Green lettuce varieties 95 Endive 95 Cress 90 Lamb s lettuce 85 Parsley 80 Rocket 85 Spinach 90 PSA-Kit-01 PSA-Kit-02 PSA-Kit-07 PSA-Kit-01A PSA-Kit-02A A Product group Sample material Typical water content g/100 g Stem vegetables Legumes Cereals Other foodstuffs Oil, other foodstuffs Foodstuffs of animal origin g/10 g sample g/5 g sample QuEChERS PSA-Kits Vegetables (continued) EN AOAC Asparagus 95 Celery 95 Leek 85 Artichoke 95 Rhubarb 85 Peas, beans, lentils (dried) Peas, beans, lentils (fresh) Wheat, corn, rice (flour, grains) < PSA-Kit-01 PSA-Kit-02 A PSA-Kit-01A PSA-Kit-02A A Other foodstuffs EN AOAC < Coffee beans [3] Tea [3] < 10 < Herbs, spices PSA-Kit-07 (dried) [4] < Mushrooms 90 PSA-Kit-01 Wine 90 PSA-Kit-02 Olive oil, rapeseed oil < 10 Citrus oil < 10 Olives < 10 Avocado 75 Cocoa solids Baby food Meat, fish, seafood Dairy products [1] Addition of 600 µl 5 mol/l NaOH solution to the buffer salts [2] Addition of 200 µl 5 mol/l NaOH solution to the buffer salts [3] only use 2 g of sample material for fermented products [4] only use 2 g of sample material for products full of extracts A A A PSA-Kit-07A A PSA-Kit-01A PSA-Kit-02A A A PSA-Kit-07A A A A A A PSA-Kit-07A A

7 BEKOlut GmbH & Co. KG Glockenstraße Hauptstuhl Telephone Telefax Peter.Bruch@bekolut.de