Curcumin derivative with high photosensitive bactericidal activity, preparation method and photodynamic sterilization and fresh-keeping method for fresh shrimps
A technology of curcumin derivatives and bactericidal activity, which is applied in food ingredients as antimicrobial preservation, chemical instruments and methods, food science, etc. It can solve the problems of poor fresh-keeping effect, damage to texture and flavor, uncontrollable safety of fresh-keeping technology, etc. problems, to achieve the effect of prolonging the preservation time, avoiding the destruction of texture and flavor, and increasing the singlet oxygen production rate
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Embodiment 1
[0057] Synthesis of curcumin derivative II with high photosensitivity and bactericidal activity, wherein the structural formula of curcumin derivative II is as follows:
[0058]
[0059] , the reaction equation is as figure 1 shown.
[0060] At room temperature, N 2 Under protective conditions, accurately weighed 1 mmol of curcumin and 3 mmol of 4-dimethylaminopyridine were dissolved in a reaction flask with 15 mL of N,N-dimethylformamide, and stirred at room temperature for 1 h, during which 1 mmol of 1-dimethylaminopyridine was added every 20 min. Ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and finally 2 mmol of 3-carboxy-2,2,5, dissolved in 5 mL of N,N-dimethylformamide, was added. 5-tetramethylpyrrolidine-1-oxyl radical, and continue to stir the reaction for 12h. After the reaction, the curcumin derivative II with high photosensitivity and bactericidal activity was obtained through extraction and column chromatography purification, such as: figure 2 As...
Embodiment 2
[0062] At room temperature, N 2 Under protective conditions, accurately weighed 1 mmol of curcumin and 1 mmol of 4-dimethylaminopyridine were dissolved in a reaction flask with 15 mL of N,N-dimethylformamide, and stirred at room temperature for 1 h, during which 0.5 mmol of 1 mmol was added every 30 min. -Ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and finally 3 mmol of 3-carboxy-2,2,5 dissolved in 5 mL of N,N-dimethylformamide was added , 5-tetramethylpyrrolidine-1-oxyl radical, and continue to stir the reaction for 12h. After the reaction, the curcumin derivative II with high photosensitivity and bactericidal activity was obtained by extraction and purification by column chromatography.
Embodiment 3
[0064] The curcumin derivative II of embodiment 1 is applied to the method for the photodynamic sterilization and preservation of fresh shrimp, and the concrete steps are as follows:
[0065] 1) Prepare 10 μM Curcumin Derivative II aqueous solution and fill it in a light-proof watering can;
[0066] 2) Select fresh and complete, brightly colored and uniformly sized Penaeus vannamei, immerse it in ice water and freeze it to death quickly, use sterile saline to wash and drain the surface moisture;
[0067] 3) using the spraying method, the prepared curcumin derivative II aqueous solution in step 1) is sprayed in sufficient amount and uniformly on the surface of the fresh shrimp prepared in step 2), and let stand in the dark for 5min;
[0068] 4) The fresh shrimp prepared in step 3) is placed under a blue LED matrix with a light power of 30W for irradiation for 120s, and the irradiation wavelength is 400nm to complete the process of photodynamic sterilization and preservation.
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