Active intelligent food preservative film and preparation method thereof

A food preservation and intelligent technology, applied in the field of polymer packaging materials, can solve the problems of easy decomposition and easy oxidation of natural anthocyanins, and achieve the effects of enhancing freshness preservation ability, prolonging effective use time and enhancing stability

Inactive Publication Date: 2019-12-20
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem that natural anthocyanins are easily oxidized and decomposed in the natural environment, and grafts citric acid onto natural anthocyanin molecules to enhance its stability

Method used

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  • Active intelligent food preservative film and preparation method thereof

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preparation example Construction

[0049] The invention also provides a preparation method of the active intelligent food preservation film, which includes the following steps.

[0050] 1) Add 8-16 parts of thionyl chloride and 8-16 parts of cinnamic acid to 200 parts of dioxane solution, stir and reflux in a water bath at 70-90 °C for 2-4 h, after the reaction, 40- The excess thionyl chloride was removed by rotary evaporation at 60 °C for 0.5-1 h, and the remaining solution was collected.

[0051] 2) Add 8-16 parts of natural anthocyanins and 0.5-2 parts of pyridine to the remaining solution in step 1), stir and reflux in a water bath at 70-90 ° C for 2-4 h, after the reaction, 60-80 ° C Rotary evaporation was repeated until the crystals were precipitated, and the precipitated crystalline material was collected.

[0052] 3) Add the precipitated substance obtained in step 2) to 100 parts of 90 ℃ acetone solution, stir to dissolve it, then cool the acetone solution to 0 ℃, let it stand for 1-3 h, wait for the c...

Embodiment 1

[0058] An active intelligent food preservation film, which is prepared from the following raw materials in parts by weight:

[0059] Cinnamic Acylated Anthocyanins 15 parts

[0060] Low methoxyl pectin 20 parts

[0061] Chitosan 20 parts

[0062] Glycerin 10 parts

[0063] 4 parts acetic acid

[0064] Wherein, the cinnamic acid-modified anthocyanins are prepared from the following raw materials in parts by weight:

[0065] Grape seed anthocyanins 12 parts

[0066] 12 parts cinnamic acid

[0067] Thionyl chloride 12 parts

[0068] 1 part pyridine

[0069] The invention also provides a preparation method of the active intelligent food preservation film, which includes the following steps.

[0070] 1) Add 12 parts of thionyl chloride and 12 parts of cinnamic acid to 200 parts of dioxane solution, stir and reflux in a water bath at 80 °C for 3 h, after the reaction is completed, remove excess by rotary evaporation at 50 °C for 1 h Thionyl chloride, and collect the remaining...

Embodiment 2

[0078] An active intelligent food preservation film, which is prepared from the following raw materials in parts by weight:

[0079] Cinnamic Acylated Anthocyanins 10 parts

[0080] Low methoxyl pectin 20 parts

[0081] Chitosan 20 parts

[0082] Glycerin 10 parts

[0083] 4 parts acetic acid

[0084] Wherein, the cinnamic acid-modified anthocyanins are prepared from the following raw materials in parts by weight:

[0085] Grape seed anthocyanins 8 parts

[0086] 8 parts cinnamic acid

[0087] Thionyl chloride 8 parts

[0088] Pyridine 0.7 parts

[0089] Preparation scheme is the same as embodiment 1

[0090] In this embodiment, the amount of cinnamic acid acylated anthocyanins is relatively low, and the corresponding color indicates that the plastic wrap is mainly for foods that generate less alkaline gas during the spoilage process, such as dried meat, dried meat, and dried meat.

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Abstract

The invention belongs to the field of food packaging, and particularly relates to a food packaging film taking modified anthocyanin as a food freshness indicator. The active intelligent food packagingfilm is prepared from the following raw materials in parts by weight: 10 to 20 parts of cinnamic acid modified anthocyanin, 15 to 30 parts of low-methoxy pectin, 15 to 30 parts of chitosan, 5 to 15 parts of glycerinum and 3 to 5 parts of acetic acid; wherein the cinnamic acid modified anthocyanin is prepared from the following raw materials in parts by weight: 4 to 8 parts of cinnamic acid, 6 to12 parts of natural anthocyanin and 4 to 8 parts of dicyclohexylcarbodiimide. Aiming at the problem that natural anthocyanin is easy to oxidize and decompose in a natural environment, cinnamic acid isgrafted to natural anthocyanin molecules, so that the stability of the natural anthocyanin is enhanced; and the modified anthocyanin is used as a color indicator and is mixed with low-methoxy pectin,chitosan and glycerol to prepare the active intelligent food packaging film. The food packaging film can prolong the shelf life of food and indicate the freshness of the food through color change.

Description

technical field [0001] The invention belongs to the field of polymer packaging materials, and in particular relates to an active intelligent fresh-keeping film for monitoring the freshness of food while keeping food fresh. Background technique [0002] Anthocyanins are one of the most important water-soluble pigments in nature. They are flavonoids that link anthocyanins and glycosides through glycosidic bonds. They are widely found in roots, stems, leaves, flowers, and fruits of plants. It has various biological activities such as anti-oxidation, scavenging free radicals in the body, anti-inflammation, anti-tumor, inhibiting obesity, regulating blood lipid balance, and inhibiting cholesterol. It is an ideal anti-oxidation and antibacterial additive. As a natural antioxidant additive, it is not questioned like synthetic antioxidants. Adding it to food cling film will slowly diffuse from the cling film to the surface or even the inside of the wrapped food, preventing the oxid...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/06C08L5/08C08K5/1545
CPCC08J5/18C08J2305/06C08J2305/08C08K5/1545
Inventor 费鹏庄远红刘静娜张美清叶妍琦曾繁森
Owner MINNAN NORMAL UNIV
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