41 results about "Sudan Red G" patented technology

The invention relates to a method to detect the Sudan red in food. It adds the detecting sample and the triton X-100 into the mixture of the AgNO3, the NaOH and the ammonia to watch the solution color change to detect that if there is the Sudan red in food; also it compares to the standard sample to go on the semi-quantitative detection; next it uses the recovery method with the mark to get the actual Sudan red concentration according to the linear equation.

The invention discloses a method for detecting Sudan red I in an aqueous phase, fluorescence test paper and a preparation method and application of the fluorescence test paper. The detection method comprises the following steps: (1) preparing a fluorescence probe solution, wherein the fluorescence probe solution is an amphipathic chitosan derivative CMCs-g-PPDO / PFO nanocomposite fluorescence probe solution, and the micelle concentration is 0.5-2mg / mL; (2) adding the fluorescence probe solution into a cuvette, and arranging the cuvette in a fluorescence spectrophotometer for scanning a fluorescence spectrum; (3) adding a to-be-detected sample solution into the cuvette containing the fluorescence probe solution in the step (2), arranging the cuvette in the fluorescence spectrophotometer for scanning a fluorescence spectrum, identifying Sudan red I pigments according to the fluorescence quenching degree, if the fluorescence spectrum quenching is obvious, the sample contains the Sudan red I pigments, and if the fluorescence spectrum does not have an obvious change, the sample does not contain the Sudan red I pigments. Furthermore, functional fluorescence test paper is prepared. The fluorescence test paper has a good detection effect on Sudan red I.

The invention relates to an electrochemical method for detecting Sudan red I. The electrochemical method includes respectively placing an expansion graphite paste electrode which is used as a working electrode, a saturated calomel electrode which is used as a reference electrode and a platinum wire electrode which is used as an auxiliary electrode into BR (Britton-Robinson) buffer solutions which contain the Sudan red I with different concentrations and have the pH (potential of hydrogen) of 3.0, stirring and gathering for 300 seconds at the potential of 0.1V, cleaning by deionized water after standing the solution for 30 seconds; then placing a system consisting of the three electrodes in BR buffer solution with the pH of 6.0, scanning by differential-pulse voltammetry to obtain an oxidation peak current value, which has a good linear relation with the concentration of the Sudan red I, of the Sudan red I within the potential range from 0.3V to 0.9V, measuring an oxidation peak current value of sample solution by the same method and obtaining the concentration of the Sudan red I according to a standard curve and a linear regression equation. The method is simple in operation, low in detection cost, high in sensitivity and good in stability and reproducibility and is convenient and speedy, and the Sudan red I is directly detected.

The invention discloses a method for synchronous detection of five colorants in hawthorn pills, comprising the following steps: (1) preparation of a blank matrix solution; (2) preparation of a mixed reference solution; (3) preparation of a sample solution; 4) Perform liquid chromatography-tandem mass spectrometry analysis; (5) Analysis of results. The five colorants are Sudan Red I, Sudan Red II, Sudan Red III, Sudan Red IV and 808 Scarlet. This method has the advantages of simple operation, high accuracy, high precision, and good stability. It can detect one or more of 5 kinds of coloring agents at the same time. After dyeing with the above five colorants, it can be detected in batches with high detection efficiency.

The invention discloses an HPLC method for determining ten synthetic colorants in a cosmetic simultaneously. According to the method, tetrahydrofuran, dimethyl sulfoxide and methyl alcohol are used for extracting the colorants in a sample under the auxiliary condition of ultrasonic wave, the colorants are separated on a chromatographic column of EclipseXDB-C18 (3.5 mu m, 4.6*150mm) through high-speed centrifugal clarification, acetonitrile and 0.02 mol / L of an ammonium acetate solution with the pH of 4.6 are taken as mobile phases for gradient elution, a diode array detector is used for performing determination, and quantification is performed with an external standard method. The method can simultaneously determine ten synthetic colorants of pigment red 57, pigment orange 5, acid yellow 36, pigment red 53, acid purple 49, rhodamine B, solvent blue 35, Sudan red II, Sudan red IV and disperse yellow 3, and the determination minimum is 20 mg / Kg. The method is simple, fast, sensitive and suitable for quantitative determination of colorants in oily, powdery and paste cosmetics.

The invention belongs to the field of extraction of natural products, in particular to a method for removing various harmful substances in capsanthin. The method of the invention comprises the following steps: dissolving the capsanthin to be treated in an organic solvent, and then separating the hazardous substances through an organic solvent-resistant nanofiltration membrane; the organic solvent is acetone, vegetable oil extraction solvent or ethyl acetate one or more of them. The method of the invention has the advantages of simple process, high capsanthin yield, and a loss rate of less than 0.5% compared with the non-removal process. The method of the invention can remove a number of harmful components at the same time, including removing benzopyrene in capsanthin, and reducing the level of tens of ppb to <10 ppb; removing illegal dyes such as Sudan red and rhodamine B, from tens to several 100 ppb is removed to less than 10 ppb; pesticide residues are removed from tens of ppm to less than 20 ppb, meeting the quality requirements of high-end products, and the safety is greatly improved.