QuEChERS, Flash Chromatography Columns 
                                 
QuEChERS Dispersive Solid Phase Extraction      
QuEChERS – a Simplified Method of Sample Preparation for Pesticide Analysis In 2003, it is a simple way to prepare food samples for pesticide analysis. It's called QuEChERS, an acronym for Quick, Easy, Cheap, Effective, Rugged and Safe. With QuEChERS, you could prepare your samples in multi-class, multi-residue pesticide analysis while saving time and money.

How QuEChERS works?
1. QuEChERS extraction method is designed for multi-residue pesticide analysis of fruits and vegetables with high water content (80%-95%). Some compounds will interfere the detection of target pesticide, such as chlorophyll, fatty acid, pigment, which could be removed by QuEChERS.
2. Some QuEChERS methods add buffers during the extraction step. Two most common methods are the European Committee for Standardization (EN 15662) method which applies citrate buffer for extraction and the Association of Analytical Communities (AOAC 2007.01) method using acetic acid buffer.
3. For low-water content fruits and vegetables, additional water needs to be added to optimize the extraction. For high-fatty content fruits and vegetables, C18E should be added to remove it. For high-pigment content fruits and vegetables, graphicarb should be added.

Order No. Description Specifications Packing
1981-5550 Extraction Kits, 4g MgSO4, 1.5g Na Acetate 50ml 25pcs/box
AOAC 2007.01 Method
1981-5755 Acetic Extraction Tube: 6g MgSO4, 1.5g Na Acetate 50ml 25pcs/box
1981-5022 PSA Clean-up tube1: 50mg PSA, 150mg MgSO4 2ml(1ml sample) 100pcs/box
1981-5058 PSA Clean-up tube2: 400mg PSA, 1200mg MgSO4 15ml(8ml sample) 50pcs/box
1981-5122 PSA/C18 Clean-up tube: 50mg PSA, 50mg C18, 150mgMgSO4 2ml(1ml sample) 100pcs/box
1981-5158 PSA/C18 Clean-up tube2: 400mg PSA, 400mg C18, 1200mg MgSO4 15ml(8ml sample) 50pcs/box
1981-5258 PSA/C18GCB Clean-up tubel1: 50mg PSA, 50mg C18, 50mg GCB 2ml(1ml sample) 100pcs/box
  150mg MgSO4    
1981-5456 PSA/C18/GCB Clean-up tube2: 400mg PSA, 400mg C18, 400mg GCB, 1200mg MgSO4 15mL(8ml sample) 50pcs/box
1981-4950 Disperzive kits, 50mg PSA, 150mg C18EC, 900mg Na2SO4 15ml(8ml sample) 50pcs/box
1981-0029 Disperzive kits All food types, 400mg PSA, 45mg GCB, 1200mg MgSO4 15ml(8ml sample) 50pcs/box
   EN 15662 Method
      25pcs/box
1981-5650 Citric acid tube:4g MgSO4, 1g NaC1, 0.5g Na-Citrate sesquihydrate, 1g Na-Citrate 50ml 25pcs/box
1981-5021 PSA Clean-up tube1: 25mg PSA, 150mg MgSO4 2ml(1ml sample) 100pcs/box
1981-5056 PSA Clean-up tube2: 150mg PSA, 900mg MgSO4 15ml(6ml sample) 50pcs/box
1981-5256 PSA/GCB Clean-up tubel: 150mg PSA, 15mg GCB, 900mg MgSO4 15ml(6ml sample) 50pcs/box
1981-5356 PSA/GCB Clean-up tube2: 150mg PSA, 45mg GCB, 900mg MgSO4 15ml(6ml sample) 50pcs/box
1981-5121 PSA/C18 Clean-up tube1: 25mg PSA, 25mg C18 2ml(1ml sample) 100pcs/box
  150mg MgSO4    
1981-5156 PSA/C18 Clean-up tube2: 150mg PSA, 150mg C18, 900mg MgSO4 15ml(6ml sample) 50pcs/box
                                
Flash Chromatography Columns      
The Flash chromatography columns are made of polypropylene, packed with narrow-dispersion silica-based packing. These columns can be easily connected to commercial Flash purification systems via Luer fittings, acting as a handy tool for separation and purification.
Order Number Description
1981-S001 Flash Column, Silica 12g
1981-S002 Flash Column, Silica 25g
1981-S003 Flash Column, Silica 40g
1981-S004 Flash Column, Silica 80g
1981-S005 Flash Column, Silica 120g
1981-C001 Flash Column, C18 12g
1981-C002 Flash Column, C18 25g
1981-C003 Flash Column, C18 40g
1981-C004 Flash Column, C18 80g
1981-C005 Flash Column, C18 120g
1981-N001 Flash Column, NH2 12g
1981-N002 Flash Column, NH2 25g
1981-N003 Flash Column, NH2 40g
1981-N004 Flash Column, NH2 80g
1981-N005 Flash Column, NH2 120g