Showing papers on "Color reaction published in 2017"
TL;DR: By employing the conventional iodine-starch color reaction, this biosensor has the potential of on-site assay of OPs residues in environmental samples and showed high sensitivity for the assay of paraoxon with a limit of detection 4.7 ppb.
39 citations
Patent•
08 Feb 2017TL;DR: A method for detecting presence of protein or biofilm on a surface includes applying a composition to the surface, and observing a color reaction if protein and biofilm are present on the surface as mentioned in this paper.
Abstract: A method for detecting presence of protein or biofilm on a surface includes applying a composition to the surface, and observing a color reaction if protein or biofilm is present on the surface. The composition comprises a first part that includes copper sulfate and a second part that includes a reagent capable of reacting with the copper sulfate to produce a visible color reaction when contacted with protein or biofilm.
2 citations
Patent•
22 Feb 2017
TL;DR: In this paper, a copper ion coloring reagent which reacts only with copper ions in solution is presented, which has an absorption wavelength of about 516 nm and does not cause color reaction with other common metal ions.
Abstract: The invention discloses a copper ion coloring reagent which reacts only with copper ions in solution. The copper ion coloring reagent has an absorption wavelength of about 516 nm, does not cause color reaction with other common metal ions, and can be used as a copper ion exclusive detection agent. The invention also provides its preparation method. The preparation method includes using the three-step synthesis reaction with fluorescein as the precursor, and the UV-visible spectrophotometric method for the concentration of the copper ion solution is established based on the reagent.
Patent•
08 Feb 2017
TL;DR: In this article, a spectrophotometry of rapidly detecting the concentration of peroxide in edible oil has been proposed, which adopts the following components including a reducing agent solution and a color development complexing agent.
Abstract: The invention discloses a spectrophotometry of rapidly detecting the concentration of peroxide in edible oil The spectrophotometry adopts the following components including a reducing agent solution and a color development complexing agent and is characterized in that a stabilizer is added in the reducing agent solution and/or the color development complexing agent or in a mixed solution of the reducing agent solution and the color development complexing agent According to the spectrophotometry, the background value of a blank sample is lowered to enable color reaction not to be interfered, a light absorption value is stable enough to enable the spectrophotometry to be combined with the existing spectrophotometric determination instrument to accurately determine the concentration of the peroxide, and poor quality oil and waste oils are effectively distinguished
Patent•
21 Jun 2017
TL;DR: In this article, a method for preparation of indicator solution consists in obtaining solution A by dissolution of methyl red in ethyl alcohol and obtaining solution B by dissolving of glycine in distilled water, after that alkali is added with mixing for 30-40 min until the color turns yellow.
Abstract: FIELD: chemistry.SUBSTANCE: invention refers to analytic chemistry, namely, to preparation of indicator compositions for production of indicator tape with subsequent photocolorimetric measurement of formaldehyde content in the air. For this purpose, the following composition of indicator solution is used with this solution containing ingredients in wt.%: glycine - 1.5-12; methyl red - 0.004-0.4; alkali - 0.04-0.6; ethyl alcohol - 30-70; distilled water - the rest. A method for preparation of indicator solution consists in obtaining solution A by dissolution of methyl red in ethyl alcohol and obtaining solution B by dissolution of glycine in distilled water. Then solutions A and B are mixed to obtain crimson-scarlet color, after that alkali is added with mixing for 30-40 min until the color turns yellow.EFFECT: invention allows to assess formaldehyde content in the air due to selective color reaction using the composition with minimum ingredient number, absence of solution toxicity and its chemical air resistance. Besides that, indicator tape produced using this composition has long shelf-life.2 cl, 1 tbl, 1 dwg, 3 ex