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Preparation and application of zinc propionate

    Zinc propionate is a colorless, needle-like crystal that breaks down in moist air to release propionate. Soluble in water, slightly soluble in ethanol. Dissolve zinc oxide in dilute propionic acid and steam the solution to crystallize. It can be used as a fungicide for adhesive tape. Zinc is an essential trace element for humans and animals, which has the functions of accelerating growth and development, improving taste, regulating body immunity, preventing infection and promoting wound healing. Zinc propionate is recognized as an economical, safe and effective edible preservative in the world.

    At present, zinc propionate can be prepared by zinc oxide method, zinc hydroxide method and multiple decomposition method. Among them, zinc hydroxide process is complex, long reaction time, low yield content and the generation of by-products; Compared with zinc hydroxide method, zinc oxide method has higher yield, but has the disadvantages of slow reaction rate and difficult control of reaction process. The double decomposition method can obviously shorten the reaction time, but with calcium propionate as reactant, the introduction of calcium ions leads to unstable product quality, high refining requirements and long process flow. Therefore, it is particularly important to find a preparation method of zinc propionate with short process route, fast reaction, thorough and easy to control.

    Zinc propionate was prepared by traditional hydrothermal method
    A certain amount of zinc oxide (mC) and deionized water were accurately weighed, respectively, and successively added into 250 mL three-mouth round-bottom flask and placed into a magnet. The flask was placed in a constant temperature oil bath, and the heating temperature was set, and the zinc oxide suspension was prepared by stirring for a certain time. When the temperature is stable, take a certain amount of propionic acid accurately, and add it into the three-mouth flask with a constant pressure drop funnel within 30 seconds; After stirring reaction for a certain time, filter while it is hot; The filtrate is evaporated, concentrated, cooled, crystallized and dried to obtain white and shiny zinc propionate crystal

    Preparation of zinc propionate by microwave hydrothermal method
    A certain amount of zinc oxide (mM) and deionized water were accurately weighed, respectively, and successively added into 250 mL three-mouth round-bottom flask; The flask was placed in the microwave reactor and the microwave reactor was turned on. Microwave radiation was carried out under a certain microwave power to raise the temperature to the set temperature. The accurate amount of propionic acid was added into the three-mouth flask with constant pressure drop funnel within 30 s. After stirring reaction for a certain time, filtrate was filtered while it was hot. After evaporation, concentration, cooling, crystallization and drying, white zinc propionate crystal was obtained.

    CN201710584328.6 discloses A method for the determination of B vitamins by ultra high performance liquid chromatography, including the following steps: 1. Weigh vitamin B1 and vitamin B2 standard products respectively, add hydrochloric acid solution to shake, ultrasound, after all dissolved, use hydrochloric acid solution to fix volume, and obtain reserve liquid A; 2. 2. Take vitamin B6 and vitamin B12 standard products, dissolve them in NaOH solution, then add hydrochloric acid solution for constant volume and ultrasound, and reserve solution B is obtained after all dissolved. 3. Reserve solution A and B are respectively absorbed and mixed into standard solution, and the standard curve is drawn based on the peak area to the mass concentration. 4. Weigh the sample, dissolve it in water with 0.1% formic acid, and then mix it with zinc propionate and potassium ferricyanide solution, then mix it with 0.1% formic acid, filter it with filter paper, take the filtrate and treat it with filter membrane, and wait for loading; 5. Determination of water-soluble vitamins in samples by ULTRA high performance liquid chromatography. The invention has good accuracy and precision.

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