7 results about "IODINE/POTASSIUM IODIDE" patented technology

The invention relates to a high-throughput screening method based on starch-iodine chromogenic reaction, which is used for rapidly identifying lactic acid bacteria strains with alpha-amylase inhibitory activity, and belongs to the technical field of microbial engineering and biological medicine. The method comprises the following steps: preparing an MRS solid culture medium containing soluble starch, preparing a flat plate, performing punching treatment, mixing an alpha-amylase solution and a to-be-detected bacterial liquid in an isovolumetric manner, adding the mixture into holes of the flat plate, performing constant-temperature culture at 37 DEG C for 24-48 hours by taking a non-inoculated alpha-amylase solution as a negative control, and detecting the content of the to-be-detected bacterial liquid in the to-be-detected bacterial liquid. After the culture is finished, uniformly dropwise adding an iodine-potassium iodide solution on the surface of the culture medium for chromogenic reaction, and judging the alpha-amylase inhibitory activity of the strain by observing the formation condition and the diameter of a transparent circle around a bacterial colony. The method has the advantages of simplicity and convenience in operation, rapidness in detection, intuitive result, safety, environment friendliness and the like, is suitable for screening the alpha-amylase inhibitory activity of various lactic acid bacteria and other microorganisms, and provides an efficient and reliable technical scheme for developing a probiotic preparation with a hypoglycemic function; the important application value is realized in the aspects of prevention and treatment of related diseases such as diabetes mellitus.

The invention discloses a second-order vector hydrophone based on an electrochemical principle, and belongs to the technical field of MEMS sensors and acoustic measurement. The hydrophone comprises two electrochemical first-order vector hydrophones (100) which are hung on a rigid support (200) through springs (300), the distance between the two electrochemical first-order vector hydrophones (100) is far smaller than the wavelength of sound waves, and speed gradient second-order quantity measurement is achieved through a finite difference approximation method. A two-dimensional electrochemical vibrator is arranged in the electrochemical first-order vector hydrophone (100), an MEMS electrode chip is arranged in a flow channel of the electrochemical first-order vector hydrophone (100), an iodine-potassium iodide electrolyte system is adopted, and a vibration signal is converted into an electric signal through an electrochemical oxidation-reduction reaction. According to the invention, the sensitivity is enhanced by using the electrochemical gain effect and the horn-shaped liquid storage cavity structure, the two-dimensional integration is realized through the integral structure design, the first-order velocity and the second-order velocity gradient can be synchronously measured at the same point, and the sensor has the advantages of high directivity, low frequency, high sensitivity, miniaturization and the like, and is suitable for underwater low-frequency sound signal detection and target positioning.

The invention provides a method for stripping and extracting gold from a copper-based gold-plated part, which comprises the following steps: S1, adding benzotriazole into an iodine-potassium iodide solution, and adjusting the pH value to 7.5-8.5 to obtain a stripping solution; s2, the copper-based gold-plated part and the deplating liquid are put into mechanical oscillation equipment, the copper-based gold-plated part is deplated through mechanical oscillation, and the deplated copper-based gold-plated part and the deplating liquid are obtained through separation; s3, the gold stripping liquid is filtered and then placed in an electrolytic bath, and gold powder is obtained through electrolysis; and S4, the gold powder is smelted and cast into a gold ingot. According to the method, the problems of matrix corrosion, low reduction efficiency, environmental pollution and the like in the prior art are solved, near-zero corrosion of the copper matrix is achieved through the copper selective inhibitor, iodine is subjected to closed-loop regeneration and recycling through the electrolysis-condensation coupling technology, and efficient, environment-friendly and economical recovery of the gold plating waste is achieved.

This invention proposes an online monitoring method for total arsenic in water, comprising the following steps: mixing a water sample with a potassium persulfate aqueous solution and heating to digest it, oxidizing all forms of arsenic to pentavalent arsenic; adding sulfuric acid and tartaric acid to the digestion solution to adjust the pH to 12, and adding ascorbic acid and potassium iodide to complex copper ions, adding potassium borohydride to generate arsine, and purging with air to remove the arsine; introducing the arsine into an iodine and potassium iodide aqueous solution to oxidize it to arsenate, then adding ammonium molybdate to generate arsine molybdenum heteropolyacid, and again adding ascorbic acid and potassium iodide to reduce it to molybdenum blue; measuring the absorbance and plotting a standard curve to calculate the total arsenic content. By using an iodine-potassium iodide solution as the arsine absorption solution, the absorption efficiency and stability are superior to conventional acidic potassium permanganate solution; simultaneously, tartaric acid masks antimony ions, and ascorbic acid and potassium iodide synergistically complex copper ions, effectively eliminating Sb. 3+ / Cu 2+ Interference can be eliminated to achieve accurate online monitoring of total arsenic in water.

The invention discloses a method for rapidly identifying phyteral adulterated fish meal, which comprises the following steps: S1, dividing fish meal to be detected into a sample A and a sample B, adding the sample A into an EP tube, and adding the sample B into a glass tube with a cover; s2, adding water into the EP pipe, uniformly mixing, sealing the EP pipe, putting the sealed EP pipe into water bath equipment, heating, and preserving heat; s3, taking out the EP tube, adding an iodine-potassium iodide solution, immediately observing the color of the mixed solution, and entering a step S7; s4, adding diluted hydrochloric acid and phloroglucinol indicators into the glass tube filled with the sample B, and covering the glass tube with a cover; s5, inclining and rotating the glass tube to enable the reacted mixed solution to be hung on the wall, and entering step S6; s6, observing the wall hanging liquid condition on the tube wall of the glass tube by adopting an intense light source, and entering the step S7; and S7, obtaining whether the to-be-detected fish meal is doped with the phytones and the types of the phytones. Equipment adopted by the method is convenient to carry and use, rapid identification can be achieved, and the identification result is accurate and reliable.

The invention discloses a method for measuring the content of calcium and copper in a catalyst promoter, which comprises the following steps: step 1, weighing a catalyst promoter sample after grinding and sieving, adding mixed acid, heating and dissolving, cooling to room temperature, fixing the volume, and uniformly shaking for later use; step 2, respectively adding an aluminum matrix into the standard solutions of calcium and copper elements, and gradually diluting into standard working solutions with a series of concentrations; 3, adjusting the working parameters of the instrument; 4, drawing a standard curve; and 5, sample determination. According to the method, iodine and potassium iodide reagents with relatively high price are not needed, and calcium and copper can be simultaneously determined, so that resources are saved, the cost is reduced, and the analysis efficiency is improved.

The invention relates to a cydiodine lozenge which comprises the following components: iodine, potassium iodide, menthol, beta-cyclodextrin, cane sugar, hydroxypropyl methylcellulose, magnesium stearate, hydrogenated lecithin and cholesterol. The invention further relates to a preparation method of the cydiodine lozenge. The preparation method comprises the steps of iodine-containing liposome inclusion, menthol inclusion, granulation, total mixing and tabletting. According to the invention, potassium iodide and iodine are mixed to form triiodide ions which are more stable than I2, better in water solubility and lower in volatility; beta-cyclodextrin can embed I2 and physically isolate iodine molecules to inhibit volatilization; hydrogenated lecithin and cholesterol cooperate to form a hydrogenated lecithin bimolecular layer to wrap iodine molecules, so that the volatility is effectively reduced, and the stability is improved.