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For the popular QuEChERS method (Quick Easy Cheap Effective Rugged Safe) MACHEREY-NAGEL offers CHROMABOND® Diamino adsorbent for some years. The special modified silica with primary and secondary amine function removes polar compounds (e.g. organic acids, pigments, sugars) from matrices like fruit or vegetables in the pesticides analysis.
Different modifications of the QuEChERS method have been elaborated for optimising the extraction of pH-dependent compounds, for minimising decomposition of sensitive substances, and for broadening the matrix spectrum. Aside from Diamino adsorbent MACHEREY-NAGEL offers a broad range of different CHROMABOND® QuEChERS Pre-Mixes, containing precisely weighted salts and buffers (e.g. magnesium sulfate, black carbon, C18 silica, sodium citrate or acetate). 

Extraction Buffer Mixes: 
- Mix I citrate extraction mix 
- Mix II acetate extraction mix

Clean-up Mixes: 
- Mix III for food with low fat content 
- Mix IV for samples with moderate content of chlorophyll and carotinoids; e.g. carrots or lettuce 
- Mix V with black carbon for food with high content of chlorophyll and carotinoids; e.g. bell peppers or spinach 
- Mix VI with C18ec for samples with higher fat content; e.g. avocados

Advantages of ready-to-use CHROMABOND® QuEChERS Pre-Mixes: 
- high-precision weighted mixtures 
- high reproducibility 
- individual combinations possible 
- economical, because less time- and personnel-consuming

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