CN-122011518-A - Starch-based material based on esterification modification and preparation method and application thereof

Abstract

The invention belongs to the field of packaging materials, and particularly relates to a starch-based material based on esterification modification, and a preparation method and application thereof. The starch-based material is prepared by melt blending esterified starch, a plasticizer and nano silicon dioxide. The starch-based material, especially the film, has good hydrophobicity and mechanical strength, excellent barrier property, effectively delays the oxidative deterioration of grease and the photo-oxidative degradation of chlorophyll, and is a novel, environment-friendly, safe and reliable packaging material. And the preparation process is simple, convenient and universal, easy to operate and suitable for industrial production.

Inventors

• LI LI
• WANG XULIANG
• FAN MIN
• DONG QINGFENG
• QIAN KUNPENG

Assignees

• 上海海洋大学

Dates

Publication Date

20260512

Application Date

20260123

Claims (10)

1. 1. A starch-based material based on esterification modification is characterized by being prepared by melt blending esterified starch, a plasticizer and nano silicon dioxide.
2. 2. The starch-based material according to claim 1, wherein the mass ratio of the esterified starch, the plasticizer and the nano-silica is 1:0.1-0.5:0.01-0.05, the esterified starch is at least one selected from the group consisting of acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch, alkenyl succinate starch, and the plasticizer is selected from the group consisting of polyethylene glycol and sorbitol.
3. 3. The starch-based material of claim 1, wherein the starch-based material is in any of a bar, granule, tablet, or film form.
4. 4. A preparation method of a starch-based material based on esterification modification is characterized by comprising the steps of carrying out melt blending and extrusion molding on esterified starch, a plasticizer and nano silicon dioxide to obtain a strip-shaped or granular starch-based material.
5. 5. The method according to claim 4, further comprising melt-extruding, casting or hot-press molding the granular starch-based material to obtain a sheet-like or film-like starch-based material.
6. 6. The preparation method according to claim 4, wherein the mass ratio of the esterified starch to the plasticizer to the nano silicon dioxide is 1:0.1-0.5:0.01-0.05, the esterified starch is at least one selected from acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch and alkenyl succinic acid ester starch, and the plasticizer is selected from polyethylene glycol and sorbitol.
7. 7. A starch-based material according to any one of claims 1 to 3 or a starch-based material prepared by the method of any one of claims 4 to 6 for use in the oxidation resistance of oils or chlorophyll against photo-oxidative degradation, or for use in the preparation of an oxidation resistant packaging product for oils or fats, or for use in the preparation of a packaging product for oils or chlorophyll-containing products.
8. 8. A packaging product comprising the starch-based material according to any one of claims 1-3 or the starch-based material prepared by the method of preparation according to any one of claims 4-6, selected from any one of the following: (1) An antioxidant packaging product for grease; (2) A packaging product comprising a fat or chlorophyll product.
9. 9. The packaged product of claim 8, wherein the packaged product is selected from any one of a can, bottle, bag, pouch, roll, box, film.
10. 10. The packaged product of claim 8, wherein the oil-and-chlorophyll-containing product is selected from any one of a fat-and-chlorophyll-containing fruit, vegetable, nut, meat, and flower.

Description

Starch-based material based on esterification modification and preparation method and application thereof Technical Field The invention belongs to the field of food packaging materials, and particularly relates to a starch-based packaging film based on esterification modification, a preparation method and application thereof, in particular to a mechanism for influencing oxidative stability of avocado by regulating and controlling film barrier and mechanical properties through esterification groups. Background The use of suitable packaging materials and methods to minimize food losses, particularly oxidative deterioration of high nutritional value oils (e.g., avocado oil), has been the focus of food packaging. The avocado oil is used as functional oil with high nutritive value, the unsaturated fatty acid content of the avocado oil exceeds 70 percent, and the avocado oil is extremely easy to undergo autoxidation reaction in the storage process, so that the acid value is increased and peroxide is accumulated. Although polyolefin packaging materials commonly used in the industry can effectively block oxygen and water vapor, white pollution caused by nondegradable property is a global environmental problem. Starch-based films are considered ideal substitutes due to biodegradability and regenerability, however, the dense hydroxyl interactions among natural starch molecular chains lead to obvious defects of materials that the films show strong hydrophilicity (water contact angle is usually lower than 50 DEG), brittle fracture is caused by stress concentration at the interface of a crystallization area and an amorphous area, and the oxygen barrier property is insufficient (OTR >15cm 3/m2. D. KPa), and the characteristics severely limit the application of the films in the field of oil preservation. In recent years, esterification modification has proven to be an effective way to improve the properties of starch films. By introducing hydrophobic ester groups on starch molecular chains, the hydrophilicity of the material can be obviously reduced, and the introduction of phosphate groups can form intermolecular cross-linked networks, so that the mechanical strength is enhanced. However, the prior researches still have obvious defects that most of the work is concentrated on a single esterification type (such as researching acetylation or phosphorylation only), the research on the differential regulation mechanism of different esterification groups (hydrophobic acetyl and charged phosphate groups) on a multi-scale structure of a film is lacking, in addition, a complete set of general processing technology is lacking, most of starch and modified starch can be subjected to film preparation, a very narrow processing window is adapted, and meanwhile, the key scientific problem of how to interfere the oxidation path of grease by influencing the microstructure of the film due to the characteristics of the esterification groups is not clarified, which severely restricts the directional design of the functional starch packaging material. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a starch-based material based on esterification modification, a preparation method and application thereof, the starch-based material based on esterification modification has good barrier and mechanical properties, effectively delay the oxidative deterioration of grease and the photo-oxidative degradation of chlorophyll, and the preparation process is simple, convenient and easy to operate, has strong universality and is suitable for industrial production. The invention provides a starch-based material based on esterification modification, which is prepared by melt blending of esterified starch, a plasticizer and nano silicon dioxide. The mass ratio of the esterified starch to the plasticizer to the nano silicon dioxide is 1:0.1-0.5:0.01-0.05, preferably 1:0.1-0.3:0.02-0.04, and further preferably 1:0.2:0.03. The esterified starch is at least one selected from acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch and alkenyl succinic acid ester starch, preferably at least one selected from acetate starch, phosphate starch and acetylated distarch phosphate. The plasticizer is selected from polyethylene glycol and sorbitol, and the mass ratio of the polyethylene glycol to the sorbitol is 1:0.1-9, preferably 1:0.5-3, more preferably 1:1, and preferably PEG-200 and sorbitol. The melt blending comprises melt extrusion and melt extrusion casting or melt extrusion and hot press molding, wherein the temperature of the melt extrusion is set to 80-85 ℃, 90-95 ℃, 95-100 ℃, 105-110 ℃, 115-120 ℃, 105-110 ℃ and 95-100 ℃ in sequence, and the rotating speed of a screw is 40-100rpm. The temperature of the remelting extrusion casting is set to 80-85 ℃, 90-95 ℃, 95-100 ℃, 105-110 ℃, 115-120 ℃, 105-110 ℃ and 95-100 ℃ in sequence, and the rotating speed of the screw is