Water-based fruit and vegetable fresh-keeping paint and preparation method thereof
A water-based technology for fruit and vegetable preservation, applied in the field of coatings, can solve the problems of limited raw materials, toxicity, and harsh production process of fresh-keeping coatings, and achieve the effect of improving anti-corrosion and antibacterial effects, simple ingredients, and avoiding softening of texture
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Embodiment 1
[0030] 1. Preparation of traditional Chinese medicine antiseptic extract:
[0031] 1) Grind 10kg bellflower, 7kg peony cortex, 3kg wild chrysanthemum, and 9kg Gastrodia elata into traditional Chinese medicine powder with a particle size of less than 5 microns, and mix well;
[0032] 2) Put the well-mixed traditional Chinese medicine powder in an extraction tank filled with 500kg of 10V% ethanol aqueous solution, stir and extract at 40°C for 6h;
[0033] 3) Cool down to room temperature, add 0.3kg of acetic acid to the extraction tank, carry out leaching at 25°C for 4 hours, then filter with an ultrafiltration membrane, and the filtrate is the traditional Chinese medicine antiseptic extract;
[0034] 2. Preparation of fruit and vegetable softening inhibitors
[0035] Dissolve a mixture of 3kg D-calcium pantothenate, 2kg calcium glycerophosphate and 1kg zinc sulfate in 6kg phosphate aqueous solution with a pH of 5.0, and stir for 2 hours. (Phosphate is prepared by adjusting po...
Embodiment 2
[0041] 1) Dissolve 10 parts by weight of fruit and vegetable softening inhibitor in 100 parts by weight of purified water, then add 4 parts by weight of sodium metaphosphate, 2 parts by weight of carrageenan and 3 parts by weight of cyclodextrin in sequence, raise the temperature to 65°C, stir and disperse for 1 hour;
[0042] 2) Add phosphate to step 1) to adjust the pH to 5.6, cool down to 20°C after the system is basically dissolved, then add 25 parts by weight of traditional Chinese medicine antiseptic extract and stir evenly;
[0043] 3) Finally, use phosphate to adjust the pH to 7.2-7.4 to obtain a water-based fresh-keeping coating for fruits and vegetables.
[0044] Chinese medicine antiseptic extract and fruit and vegetable softening inhibitor are the same as in Example 1.
Embodiment 3
[0046] 1) Dissolve 11 parts by weight of fruit and vegetable softening inhibitor in 102 parts by weight of purified water, then add 4 parts by weight of diacetyl tartaric acid mono-diglycerides, 2 parts by weight of locust bean gum and 3 parts by weight of sodium starch phosphate and heat up to 65°C and stir Disperse for 1h;
[0047] 2) Add phosphate to step 1) to adjust the pH to 5.8, cool down to 20°C after the system is basically dissolved, then add 26 parts by weight of traditional Chinese medicine antiseptic extract and stir evenly;
[0048] 3) Finally, use phosphate to adjust the pH to 7.2-7.4 to obtain a water-based fresh-keeping coating for fruits and vegetables.
[0049] Chinese medicine antiseptic extract and fruit and vegetable softening inhibitor are the same as in Example 1.
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