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All-natural plant composite preservative and preparation method and preservation method thereof

A natural plant and composite fresh-keeping technology, applied in food science, food preservation, application, etc., can solve the problem of limited antibacterial range, achieve the effects of reducing microbial invasion, low cost, and extending shelf life

Inactive Publication Date: 2011-04-20
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] A single plant extract can inhibit the reproduction and growth of some fruit-rot microorganisms, but its antibacterial range is limited. Several plant extracts with excellent antibacterial effects The combination can greatly increase its antibacterial range

Method used

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  • All-natural plant composite preservative and preparation method and preservation method thereof

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Effect test

preparation example Construction

[0029] The preparation method of the above-mentioned all-natural plant composite antistaling agent comprises dissolving star anise extract, thyme extract, oregano extract, litsea cubeba extract, and chitosan in distilled water according to the formula, adding distilled water to the required concentration, Stir well until uniform, then add emulsifier, ultrasonically disperse to obtain a uniform preservative.

[0030] The preparation method of described each plant extract comprises the following steps:

[0031] Step 1, crushing the raw material into 30-100 meshes, adding ethanol aqueous solution with a concentration of 60%-95%, the ratio of raw material to ethanol aqueous solution is 1g: (6-10)ml, and soaking for 12-24 hours;

[0032] Step 2: Ultrasonic-assisted extraction of the solid-liquid mixture treated in Step 1. Ultrasonic extraction conditions: ultrasonic temperature is 40-60°C, ultrasonic frequency is 20-40kHz, and ultrasonic extraction time is 30-60 minutes; then the s...

Embodiment 1

[0040] 1. The preparation of plant extracts such as star anise, thyme, oregano, litsea cubeba in the all-natural plant compound preservative includes the following steps (taking star anise as an example, others are the same):

[0041] Step 1: crush 100 grams of star anise into 60 meshes, add 800 ml of 75% ethanol distilled aqueous solution, and soak for 12 to 24 hours;

[0042] Step 2: Ultrasonic-assisted extraction of the solid-liquid mixture treated in Step 1. Ultrasonic extraction conditions: ultrasonic temperature is 50° C., ultrasonic frequency is 30 kHz, and ultrasonic extraction time is 45 minutes. Then the solid-liquid mixture is suction-filtered under 40kPa vacuum conditions, and the filtrate is distilled under reduced pressure at 30kPa vacuum and 55°C to recover ethanol to obtain a mixture containing extract components and water;

[0043] Step 3, extraction and liquid separation, the extraction solvent used is ethyl acetate, the extraction layer is vacuum-distilled a...

Embodiment 2

[0056] 1. The preparation method of plant extracts such as star anise, thyme, oregano, litsea cubeba in the all-natural plant composite antistaling agent is the same as embodiment 1.

[0057] 2. Dissolve star anise extract, thyme extract, oregano extract, litsea cubeba extract, and chitosan in distilled water according to the following weight ratio, add distilled water to the required concentration, stir well until uniform, and then add Emulsifier Tween 20, ultrasonic dispersion, to obtain a uniform preservative.

[0058] Star Anise Extract 0.07%

[0059] Thyme Extract 0.02%

[0060] Oregano Extract 0.03%

[0061] Litsea cubeba extract 0.03%

[0062] Chitosan 1%

[0063] Emulsifier 0.05%

[0064] 3. Fruit preservation test

[0065] The fresh-keeping processing method of fruits such as cherries is with embodiment 1.

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Abstract

The present invention discloses an all-natural plant composite preservative and preparation method and preservation method thereof. The preservative comprises, by weight percentages, the following ingredients: 0.02%-4% of star anise extract, 0.01%-3% of thyme extract, 0.01%-2% of origanum vulgare extract, 0.02%-5% of litsea cubeba extract, 0.5%-3% of chitosan, 0.05%-12% of emulsifier, and the balance of distilled water. The preservative prepared by the present invention has excellent effect for inhibiting the rot-causing pathogens appeared during the storage of fruits such as cherry; is easy used; can be used to soak fruits or sprayed directly onto fruits; can reduce the rot rate of cherry by more than 50% after room temperature storage for 7 days, compared with a blank group; can also slowdown the water loss of the cherry, maintain the quality of the cherry, and improve the marketability of the cherry.

Description

technical field [0001] The invention relates to a fresh-keeping agent, a preparation method and a fresh-keeping method thereof, in particular to an all-natural plant composite preservative, a preparation method and a fresh-keeping method thereof, which are suitable for keeping fruits such as cherries fresh under normal temperature conditions. Background technique [0002] Post-harvest fruit rot is a global problem. According to statistics, about 25% of fresh fruits lose their commodity value due to rot and deterioration during storage and transportation, and some perishable fruits lose more than 30% of their value due to post-harvest rot. It is of great significance to carry out antiseptic and fresh-keeping measures on fruits to reduce their rot loss. [0003] At present, the main methods of fruit preservation at home and abroad are: physical preservation (mainly including low-temperature refrigeration preservation method, modified atmosphere preservation method, decompressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/3562
Inventor 王建清杨志岩刘光发金政伟高珊珊
Owner TIANJIN UNIV OF SCI & TECH
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