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- Litborn, E., et al.
(författare)
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Liquid lid for biochemical reactions in chip-based nanovials
- 2000
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Ingår i: Journal of Chromatography B. - 0378-4347. ; 745:1, s. 137-147
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Tidskriftsartikel (refereegranskat)abstract
- The present paper describes a new technique to suppress evaporation of solvent from very small volumes. Vials (15 nl) on a silicon microchip were filled with water, and covered with a thin, flowing film of a volatile liquid (e.g., octane). Water evaporation was greatly reduced. At 37 degrees C, no appreciable loss of water could be observed over a period of 90 min. At 95 degrees C, most of the water sample was left in the vial for more than 3 min. The applicability of the method is demonstrated by a tryptic digest, where the resulting peptide fragments were analyzed by capillary electrophoresis. In addition, a discussion of the possibilities and limitations of some alternative methods is included in the paper, as well as an outlook on future developments of the liquid lid concept.
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- Litborn, E., et al.
(författare)
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Parallel reactions in open chip-based nanovials with continuous compensation for solvent evaporation
- 2000
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Ingår i: Electrophoresis. - 0173-0835 .- 1522-2683. ; 21:1, s. 91-99
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Tidskriftsartikel (refereegranskat)abstract
- In an earlier report (Litborn, E., Emmer,,Angstrom., Roeraade, J., Anal. Chim. Acta 1999, 401, 11-19, we described a technique for performing chemistry in chip-based vials. A major problem, solvent evaporation, was partially remedied by using a closed humidity chamber. in this paper we report an improved technique for performing parallel reactions in open, 15 nL volume, chip-based vials. The evaporation of solvent from the reaction fluid was continuously compensated by addition of solvent via an array of microcapillaries. The suitability of the method was demonstrated by performing eight separate peptide maps of myoglobin in parallel, using the three enzymes trypsin, alpha-chymotrypsin and endoproteinase Glu-C. The total amount of myoglobin utilized to perform the eight digests was less than 100 pmol. The corresponding amount of enzymes was ca. 0.1 pmol per reaction. In order to evaluate the operating limits of the technique, a study of the evaporation of solvents from a series of vials with proportionally smaller volumes operated at different temperatures was performed. The results showed that the concept for continuous compensation of solvent evaporation should be applicable to reaction volumes down to 30 pL.
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