1. It has the following characteristics 1. Chromate eluant is used.

2. Ammonium chloride is a better eluant, and L-leucine and L-valine can be separated successfully by gradient elution.

3. The eluant was selected by TLC and TLC was also used to identify the effect of the TLC separation, and the molecular constructures were characterized by IR.

4. The aim of saving the eluant can be achieved when it is replaced after 4 circles. The efficiency of reclaim is above 80%.

5. The kind of eluant and the concentration of eluant have effect on elution.

6. When the biological material requires administration, the eluant can be passed across the membrane dissolving the glass and causing the substance to be carried by the liquid into the patient.

7. Analytes in eluant were determined using GC equipped with FPD and external standard method.

8. The eluant of gold is 1 % sodium sulfite solution or 2 % thiourea solution.

9. With hydrochloric acid as eluant, the procedure can be greatly simplified.

10. The adsorption effect of GPC column, the choice of detection method and the influence of added salts in eluant were examined experimentally.

11. A simple and efficient method for concentration of enteroviruses from water sample was established based on the membrane adsorption-elution method combined with eluant concentration.

12. Evaluated by recovery, the influence of concentration of sample, pH, concentration of eluant and flow rate of elution had been investigated by orthogonal experimental design.

13. These problems have been obviated by supporting the glassy material on a porous membrane remote from the eluant.

14. This invention discloses test kit and method for extracting DNA by noninvasive micro sampling. The test kit contains lysate solution, silica gel adsorber, cleaning solution, and eluant.

15. In order to have a high elution rate, the ethanol with the concentration of 70% could be used as eluant .

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16. This method can be used in the determination of fermentation broth, eluant. A convenient and fast method was provided for the quality control of mitomycin C in fermentation broth and eluant.

17. MethodsThe orthogonal test was adopted to study the eluting effect of MDG with the elution rate as an index, and concentration of eluant, amount, elution velocity as the influence factors.