Hydrophobic edible preservative film and preparation method thereof

A hydrophobic, fresh-keeping film technology, applied in the field of food packaging, can solve the problems of deterioration, easy water absorption and mechanical properties, and achieve the effects of enhanced hydrophobic performance, good biocompatibility and degradability, as well as fresh-keeping performance and strong binding force.

Inactive Publication Date: 2020-01-14
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to graft behenic acid onto low methoxyl pectin molecules and use its ultra-long carbon chains to improve pectin production in order to solve the problem that the current bio-based food preservation film is easy to absorb water and its mechanical properties deteriorate sharply after absorbing water. Hydrophobic performance, and mixed with chitosan to prepare a kind of hydrophobic edible plastic wrap and its preparation method

Method used

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  • Hydrophobic edible preservative film and preparation method thereof

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preparation example Construction

[0025] The present invention also provides the hydrophobic edible fresh-keeping film and its preparation method, comprising the following steps.

[0026] 1) Dissolve 30-60 parts of behenic acid in 200 parts of dichloromethane solution, and stir the solution in an ice-water bath.

[0027] 2) Dissolve 15-30 parts of dicyclohexylcarbodiimide in 100 parts of dichloromethane, and add it to the solution described in step 1), and stir in an ice-water bath for 2-4 h.

[0028] 3) Filter the mixed solution to remove the white solid residue (dicyclohexylurea), and collect the filtrate.

[0029] 4) Add 10-20 parts of low-methoxyl pectin and 2-4 parts of potassium carbonate to the filtrate collected in step 3), stir and heat in a water bath at 60-90 °C for 2-4 h, and then concentrate the filtrate by rotary evaporation , followed by freeze-drying the concentrated solution to collect the powdery substance, namely behenate pectin.

[0030] 5) Add 15-30 parts of chitosan to 500 parts of deio...

Embodiment 1

[0035] A hydrophobic edible plastic wrap and a preparation method thereof, which is prepared from the following raw materials in parts by weight:

[0036] Behenate pectin 45 parts

[0037] Chitosan 20 parts

[0038] Glycerin 15 parts

[0039] acetic acid 5 parts

[0040] Wherein the behenate pectin is prepared from the following raw materials in parts by weight:

[0041] 45 parts behenic acid

[0042] Dicyclohexylcarbodiimide 20 parts

[0043] Low methoxyl pectin 15 parts

[0044] Potassium carbonate 3 parts

[0045] The present invention also provides the hydrophobic edible fresh-keeping film and its preparation method, comprising the following steps.

[0046] 1) Dissolve 40 parts of behenic acid in 200 parts of dichloromethane solution, and stir the solution in an ice-water bath.

[0047] 2) Dissolve 20 parts of dicyclohexylcarbodiimide in 100 parts of dichloromethane, add to the solution in step 1), and stir in an ice-water bath for 3 h.

[0048] 3) Filter the mixe...

Embodiment 2

[0055] A hydrophobic edible plastic wrap and a preparation method thereof, which is prepared from the following raw materials in parts by weight:

[0056] Behenate pectin 45 parts

[0057] Chitosan 20 parts

[0058] Glycerin 10 parts

[0059]acetic acid 5 parts

[0060] Wherein the behenate pectin is prepared from the following raw materials in parts by weight:

[0061] 45 parts behenic acid

[0062] Dicyclohexylcarbodiimide 20 parts

[0063] Low methoxyl pectin 15 parts

[0064] Potassium carbonate 3 parts

[0065] Concrete preparation method is with embodiment 1.

[0066] In this example, the amount of added glycerin is low, and the tensile strength of the composite film is high, but the toughness is very poor.

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Abstract

The invention belongs to the technical field of food packaging, and particularly relates to a hydrophobic edible preservative film and a preparation method thereof. The hydrophobic edible preservativefilm is prepared from the following raw materials in parts by weight: 30 to 60 parts of behenic acid esterified pectin; 15 to 30 parts of chitosan, 10 to 20 parts of glycerinum, and 5 to 10 parts ofacetic acid; wherein the behenic acid esterified pectin is prepared from, by weight, 30 to 60 parts of behenic acid, 15 to 30 parts of dicyclohexylcarbodiimide, 10 to 20 parts of low-methoxy pectin (the methyl esterification degree is 20 to 30%), and 2 to 4 parts of potassium carbonate. According to the preparation method, behenic acid is grafted to pectin molecules and blended with chitosan and glycerin, and finally the preservative film is prepared by tape casting method, so that the preservative film is endowed with good hydrophobic property by utilizing ultra-long carbon chains of behenicacid. The contact angle of an product disclosed by the invention can reach 105.6 DEG.

Description

technical field [0001] The invention belongs to the technical field of food packaging, and in particular relates to a hydrophobic edible fresh-keeping film and a preparation method thereof. In the method, behenic acid is grafted onto pectin molecules to endow the composite film with good hydrophobic performance. Background technique [0002] In recent years, edible plastic wraps prepared by compounding natural polysaccharides such as starch, chitosan, and pectin have received extensive attention in the field of food preservation. Among them, pectin is a water-soluble acidic polysaccharide substance that exists in natural plants, has good antibacterial properties, and is not only a new type of natural food film preservative. Chitosan is the only natural cationic polysaccharide in nature, and it has good antibacterial properties, film-forming properties, biocompatibility, and biodegradability, and has great advantages in packaging materials. Under the appropriate system, comp...

Claims

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Application Information

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IPC IPC(8): C08L5/06C08L5/08C08K5/053C08K5/09C08J5/18C08J3/24C08B37/06
CPCC08B37/0045C08J3/246C08J5/18C08J2305/06C08J2405/08C08K5/053C08K5/09
Inventor 费鹏郑诗钰李洁
Owner MINNAN NORMAL UNIV
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