Novel fruit and vegetable preservative and preparation method and application thereof

[0051] Example 1: The preparation method of the ion-pair compound synthesized by lauroyl arginine ethyl ester hydrochloride and nicotinic acid

[0052] Dissolve 2.0 g of sodium nicotinate (purchased from TCI (Shanghai) Chemical Industry Development Co., Ltd.) in 50 mL of water to prepare sodium nicotinic acid salt solution (A); dilute 6.8 g of ethyl lauroyl arginate hydrochloride Dissolve in 40mL of water, heat to 90°C until ethyl lauroyl arginine hydrochloride is completely dissolved to make ethyl lauroyl arginine hydrochloride aqueous solution (B); Slowly add the saline solution (A) into the aqueous solution of lauroyl arginine ethyl ester hydrochloride (B), stir continuously, react for 2 hours, cool to room temperature, filter, wash the precipitate fully with pure water, and dry the precipitate under vacuum at 60°C. That is, 7.6 g of the nicotinic acid ion pair compound was obtained.

[0053] Embodiment two lauroyl arginine ethyl ester nicotinic acid ion pair compound molecular formula, the analysis of molecular weight

[0054] by mass spectrometry, 1 H-NMR, 13 The molecular formula of the compound obtained by C-NMR spectral analysis is:

[0055] 1. Mass spectrometry (ESI) analysis

[0056] Cation B + Molecular ion peak at m / z=385.3, see figure 1 ;

[0057] Mass Spectrometry ESI + is 124.2, see figure 2 . ESI - is 122.2, the anion A - The molecular ion peak has m / z = 122.2.

[0058] The theoretically calculated value of the cation in the nicotinic acid ion-pair compound is 507.4, and the measured value is consistent with the theoretical value.

[0059] 2. NMR analysis

[0060] Ethyl lauroyl arginate hydrochloride (see image 3 ), niacin 1 H-NMR (see Figure 4 ) and LAE nicotinic acid ion pair compound 1 H-NMR (see Figure 5 )Compared. Since the LAE ion-pair compound has little change in the peak shape and chemical shift of lauroyl arginine...

[0061] Example 3: Preparation method of ethyl lauroyl arginine hydrochloride and tartaric acid synthetic ion pair compound

[0062] Dissolve 2.0 g of tartaric acid (purchased from TCI (Shanghai) Chemical Industry Development Co., Ltd.) in 50 mL of methanol, add an equivalent amount of NaOH, stir at room temperature until a white solid precipitates, filter with suction and wash three times with 30 mL of methanol to obtain sodium tartrate . Sodium tartrate salt was dissolved in 50mL of water to make sodium tartrate aqueous solution (A); 5.6g of ethyl lauroyl arginine hydrochloride was dissolved in 40mL of water, and heated to 90°C until ethyl lauroyl arginine The acid salt was completely dissolved to make ethyl lauroyl arginine hydrochloride aqueous solution (B); at 90°C, sodium tartrate aqueous solution (A) was slowly added to ethyl lauroyl arginine hydrochloride aqueous solution ( In B), stir constantly, react for 2 hours, cool to room temperature, filter, wash the precipitat...