A multifunctional microchip-based distillation apparatus for distilling and detecting formaldehyde (CH 2 O) in food products is developed. The presented apparatus comprises a disposable microchip, a steam supply system, and a recirculating cooling water supply. The microchip is formed on PMMA substrates by laser ablation and includes a sample zone, a flash distillation zone, a cooling zone, a condensation zone, and a collection zone. In the presented method, the CH 2 O sample is placed in the microchip and is vaporized by the high-throughput vapor supply and driven through the condensed zone. The condensed CH 2 O liquid is guided into the collection zone of the microchip. Finally, the distilled CH 2 O solution is determined using an AHMT spectrometry method and a paper-based RGB (red, green and blue) intensity analysis method. A distilled efficiency is as high as 98%, when a vapor stream rate is 0.4 ml/min and a distilled time is 10 min. Moreover, both detection methods show linear relationships of the corresponding CH 2 O concentrations. The actual sample suitability of the presented multifunctional microchip-based distillation apparatus is confirmed by analyzing the CH 2 O concentrations of 21 commodities.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Environmental Chemistry