Extraction

Economical and user-friendly units for extraction in accordance with Twisselmann:

• each sample position is individually adjustable
• cooling water distributor ensures an even cooling at all sample positions
• practical stand for holding the condensers securely between the extractions
• mounts for holding the spacers after the removal of the sample containers

Extraction and clean-up mixtures for sample preparation in the pesticide analysis of vegetable foodstuffs according to EN 15662 using GC/MS or LC/MS after acetonitrile extraction and purification using the dispersive SPE-QuEChERS method.

The samples are first extracted with Mix A. Purification is done with one of the following mixtures:

• Mix B (Clean-up mixture for fruits and vegetables with low fat content, e.g. apples, strawberries)
• Mix C (Clean-up mixture for fruits and vegetables with high fat content, containing oil/wax, e.g. avocados)
• Mix D (Clean-up mixture for moderately chlorophyll/carotenoid-containing fruits and vegetables, e.g. carrots, salad)
• Mix E (Clean-up mixture for fruits and vegetables with high chlorophyll/carotenoid content, e.g. sweet peppers, spinach)

• Mix A contains a bag with the required amount of mixture and a 50 ml empty tube
• Mix B, C, D and E are pre-weighed into a 15 ml tube

Compact Extraction System in accordance with Twisselmann
Complete compact extraction system with stand, heating module, mount, hoses and glassware (round-bottom reaction flask, extractor, Dimroth condenser for extraction).

Complete compact extraction systems with stand, heating module, mount, hoses and glassware (round-bottom reaction flask, extractor, Dimroth condenser for extraction). Infinitely variable heating regulation.

• practical stand for holding the condensers securely between extractions
• extractor sizes from 30 ml to 5000 ml
• the use of extractors with a stopcock eliminates the need for any additional distillation after extraction
• Condensers with screwed-on tubing nipples

• Filter mountings, 400 ml, with thread
• PP funnels with thread
• Slotted sieve plate with 2 gaskets
• Stainless steel rack
• Water jet pump

Extraction apparatus, Soxhlet-pattern. With Dimroth condenser and round-bottom flask.
Made of Duran^® tubing.

• Pollution monitoring, air sampling
• High temperature filtration (up to +500 °C)
• For solvents incompatible with cellulose thimbles (for example strong acids or bases)

Recommended for Soxhlet extraction with solvents, which are incompatible with cellulose fibres and for filtration of air and gas streams.

• Made of 100 % pure borosilicate fibres, without binding elements
• High loading capacity and highly permeable to air
• Thickness is 1.5 mm (diameter < 33 mm)
• High retention of small particles, > 99 % according to BS 4400
• Good stability at high temperatures up to 500 °C
• Recommended for hot, moist, and acidic gases
• Gravimetric determination of particles in hot gases

For reliable and fast analysis in the areas of food control and environmental monitoring. Suitable for Soxhlet-type, Tecator-type or similar devices, to extract certain components out of solid material with an appropriate solvent.

• Made of pure cellulose that is totally free from binding elements
• High purity of selected cellulose guarantees reliable and replicable results
• The consistent high porosity ensures fast flow through
• High fitting accuracy for all available extraction systems
• Wall thickness 1.3 mm at thimbles with ≤35 mm inner diameter, 1.7 mm at thimbles with >35 mm inner diameter
• For two systems
• Grade 900: Soxhlet Extraction, Grade 901: Tecator Extraction