Starch-based material based on esterification modification as well as preparation method and application of starch-based material

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 melting and blending esterified starch, a plasticizer and nano silicon dioxide. The starch-based material, especially the film, has good hydrophobicity and mechanical strength and excellent barrier performance, can effectively delay oxidative deterioration of grease and photooxidative degradation of chlorophyll, and is a novel, environment-friendly, safe and reliable packaging material. And the preparation process is simple, universal, easy to operate and suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of food packaging materials, specifically relating to a starch-based packaging film based on esterification modification, its preparation method and application, and particularly to the mechanism by which the film barrier and mechanical properties are regulated through esterification groups to affect the oxidative stability of avocado. Background Technology

[0002] Using appropriate packaging materials and methods to minimize food loss, especially the oxidative deterioration of high-nutritional-value oils (such as avocado oil), has always been a key focus in food packaging. Avocado oil, as a high-nutritional-value functional oil, has an unsaturated fatty acid content exceeding 70%, making it highly susceptible to auto-oxidation during storage, leading to increased acid value and peroxide accumulation. While polyolefin packaging materials widely used in industry can effectively block oxygen and water vapor, their non-degradable nature causes white pollution, a global environmental problem. Starch-based films are considered ideal alternatives due to their biodegradability and renewability; however, the dense hydroxyl interactions between natural starch molecular chains result in significant material defects: the films exhibit strong hydrophilicity (water contact angle typically below 50°), stress concentration at the interface between crystalline and amorphous regions leads to brittle fracture, and their oxygen barrier properties are insufficient (OTR > 15 cm). 3 / m 2 These properties (·d·kPa) severely limit its application in the field of oil preservation.

[0003] In recent years, esterification modification has proven to be an effective way to improve the performance of starch films. By introducing hydrophobic ester groups onto the starch molecular chain, the hydrophilicity of the material can be significantly reduced; while the introduction of phosphate ester groups can form an intermolecular cross-linking network, enhancing mechanical strength. However, existing research still has significant shortcomings: most studies focus on a single esterification type (such as studying only acetylation or phosphorylation), lacking research on the differential regulation mechanism of the multi-scale structure of films by different esterification groups (hydrophobic acetyl groups and charged phosphate ester groups); in addition, there is a lack of a complete and universal processing technology that can prepare films from most starches and modified starches, adapting to extremely narrow processing windows; at the same time, the key scientific question of how the characteristics of esterification groups affect the microstructure of films and thus intervene in the lipid oxidation pathway remains unclear, which seriously restricts the targeted design of functional starch packaging materials. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an esterified modified starch-based material, its preparation method, and its application. This esterified modified starch-based material possesses excellent barrier and mechanical properties, while effectively delaying the oxidative deterioration of oils and the photo-oxidative degradation of chlorophyll. Furthermore, the preparation process is simple and easy to operate, highly versatile, and suitable for industrial production.

[0005] This invention provides a starch-based material based on esterification modification, which is prepared by melt blending esterified starch, plasticizer and nano-silica.

[0006] The mass ratio of the esterified starch, plasticizer, and nano-silica is 1:0.1-0.5:0.01-0.05, preferably 1:0.1-0.3:0.02-0.04, and more preferably 1:0.2:0.03. The esterified starch is selected from at least one of acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch, and alkenyl succinate starch, preferably from at least one of acetate starch, phosphate starch, and acetylated distarch phosphate. The plasticizer is selected from polyethylene glycol and sorbitol, with a mass ratio of polyethylene glycol to sorbitol of 1:0.1-9, preferably 1:0.5-3, more preferably 1:1, and preferably PEG-200 and sorbitol.

[0007] The melt blending includes either melt extrusion followed by melt extrusion casting or melt extrusion followed by hot pressing. The temperatures for the first melt extrusion are sequentially set to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃, and 95-100℃, with a screw speed of 40-100 rpm. The temperatures for the second melt extrusion casting are sequentially set to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃, and 95-100℃, with a screw speed of 40-100 rpm.

[0008] The starch-based material based on esterification modification provided by this invention can be in the form of strips, granules, flakes, or films.

[0009] The present invention also provides a method for preparing starch-based materials based on esterification modification, the steps of which include: melt blending esterified starch, plasticizer and nano-silica, extruding and molding to obtain starch-based materials in strip or granular form.

[0010] The mass ratio of the esterified starch, plasticizer, and nano-silica is 1:0.1-0.5:0.01-0.05, preferably 1:0.1-0.3:0.02-0.04, and more preferably 1:0.2:0.03. The esterified starch is selected from at least one of acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch, and alkenyl succinate starch, preferably from at least one of acetate starch, phosphate starch, and acetylated distarch phosphate. The plasticizer is selected from polyethylene glycol and sorbitol, with a mass ratio of polyethylene glycol to sorbitol of 1:0.1-9, preferably 1:0.5-3, more preferably 1:1, and preferably PEG-200 and sorbitol.

[0011] The temperatures for the melt blending and extrusion molding processes are set to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃ and 95-100℃ respectively, and the screw speed is 40-100 rpm.

[0012] Furthermore, it also includes obtaining sheet or film starch-based materials by melt extrusion casting or hot pressing of granular starch-based materials.

[0013] The temperatures for the melt extrusion casting are set sequentially to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃ and 95-100℃, and the screw speed is 40-100 rpm.

[0014] The esterified starch-based material prepared by this invention possesses excellent hydrophobicity and mechanical properties. It also exhibits low oxygen and water vapor permeability, providing a good barrier effect. Furthermore, it effectively delays the oxidative deterioration of oils and the photo-oxidative degradation of chlorophyll. It can be used to prepare packaging products for oil-based antioxidant purposes, or packaging products containing oils or chlorophyll. These packaging products include, but are not limited to, cans, bottles, bags, rolls, boxes, cartons, and films. The oil- or chlorophyll-containing products include, but are not limited to, fruits, vegetables, and flowers containing oils or chlorophyll.

[0015] The present invention also provides a packaging product containing an esterified modified starch-based material provided by the present invention, selected from at least one of the following: (1) Products for packaging oils with antioxidant properties, such as avocado oil; (2) Packaging products containing oils or chlorophyll.

[0016] The packaging products provided by this invention include, but are not limited to, cans, bottles, bags, rolls, boxes, cartons, films, etc.

[0017] The oil- or chlorophyll-containing products of this invention include, but are not limited to, oil- or chlorophyll-containing fruits, vegetables, nuts, meats, flowers, etc.

[0018] The beneficial effects of this invention are: This invention utilizes esterified starch, which is modified through ester bonds, resulting in improved hydrophobicity and mechanical strength. Furthermore, a starch-based biodegradable material is used as the substrate for the packaging material, and a film is cast. Therefore, the esterified modified starch-based composite packaging film of this invention possesses excellent barrier properties (such as low oxygen and water vapor permeability), making it a novel, environmentally friendly, safe, and reliable packaging material. It can be applied in the field of oil preservation, effectively delaying the oxidative deterioration of avocado oil. Attached Figure Description

[0019] Figure 1 The image shows the FTIR spectrum of the esterified starch film of the present invention, illustrating the functional group changes.

[0020] Figure 2 The XRD pattern of the esterified starch film of the present invention shows the changes in crystal structure.

[0021] Figure 3 This is a comparison chart of the ultraviolet transmittance of different esterified starch films of the present invention.

[0022] Figure 4 This is a graph showing the changes in the acid value of avocado oil in different experimental groups according to the present invention.

[0023] Figure 5 This is a graph showing the changes in peroxide value of avocado oil in different experimental groups according to the present invention.

[0024] Figure 6 This is a graph showing the variation of thiobarbituric acid values ​​in avocado oil across different experimental groups of this invention.

[0025] Figure 7 This is a graph showing the color difference of avocados in different experimental groups according to the present invention.

[0026] Figure 8 This is a graph showing the changes in chlorophyll content in avocado oil in different experimental groups according to the present invention.

[0027] In this context, AS represents the acetate-based film prepared in Example 1, PS represents the phosphate-based film prepared in Example 2, ADSP represents the acetylated distarch phosphate-based film prepared in Example 3, and CS represents the ordinary corn starch film prepared in Comparative Example 1. Detailed Implementation

[0028] This invention provides a starch-based packaging film based on esterification modification, its preparation method, and its application. The acetate starch and phosphate starch in the esterified starch have different hydrophobic and charge properties. By regulating the esterification groups, the film performance is improved. The modified starch is then mixed with a plasticizer and nano-silica, granulated, and formed into a film using an extrusion casting method. The film is then used to preserve avocado oil, and the preservation effect is experimentally analyzed.

[0029] The present invention relates to a method for preparing esterified starch-based packaging films, comprising the following steps: (1) Preparation of esterified starch: Select acetate starch, phosphate starch or acetylated distarch phosphate as raw materials, mix them evenly with plasticizer (PEG-200 and sorbitol, the mass ratio of esterified starch to plasticizer is 1:0.1-1:0.5) and nano silica (addition amount 1-5wt%) to obtain composite material.

[0030] (2) Melt blending: Dry esterified starch, plasticizer and nano silica are extruded and granulated in a twin-screw extruder to obtain mixed particles of esterified starch / plasticizer / nano silica resin. The processing temperature of the twin-screw extruder is 80-120℃ and the screw speed is 40-100rpm.

[0031] (3) Casting film: The mixed particles are melted and extruded through a casting machine to form a cast film, which is then stretched laterally and longitudinally to obtain a starch-based packaging film based on esterification modification. The film thickness is 120-140μm.

[0032] Specifically, in step (1), the esterified starch can be prepared using existing esterification methods, such as acetylation or phosphorylation. The plasticizer system uses PEG-200 and sorbitol in synergy to enhance the film's flexibility. Nano-silica is used to improve interfacial stability. In step (2), the temperatures of zones 1 to 7 in the twin-screw extruder are preferably 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃, and 95-100℃, with a screw speed of 40-100 rpm. In step (3), the temperatures of zones 1 to 7 in the casting machine are preferably 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃, and 95-100℃, with a screw speed of 40-100 rpm.

[0033] The present invention provides an esterified modified starch-based packaging film obtained by the above preparation method, which has excellent barrier properties (such as low OTR and WVTR) and mechanical properties (such as high tensile strength and elongation at break).

[0034] This invention relates to an esterified modified starch-based packaging film that can be applied in the field of oil preservation, particularly for the storage of avocado oil, by inhibiting oxidation reactions and extending shelf life. The invention will be further illustrated below with specific embodiments.

[0035] Example 1: Preparation of acetate-based thin films This embodiment is based on a method for preparing esterified starch-based packaging films, which includes the following steps: (1) Select starch acetate as the base material and mix it evenly with plasticizer (PEG-200 and sorbitol, total addition amount 20wt%) and nano silica (addition amount 3wt%). The mass ratio between PEG-200 and sorbitol is 1:1.

[0036] (2) Melt blending: Extrusion granulation in a twin-screw extruder, with processing temperatures set sequentially to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃ and 95-100℃, and screw speed of 40-100 rpm.

[0037] (3) Casting film formation: The particles are cast and melt extruded to form cast sheets. The processing temperatures are set sequentially to 80-85℃, 90-95℃, 95-100℃, 105-110℃, 115-120℃, 105-110℃ and 95-100℃, and the screw speed is 40-100 rpm. Then, transverse and longitudinal stretching is performed to obtain a film thickness of 120-140 μm. The performance results are shown in Table 1.

[0038] Example 2: Preparation of Phosphate Ester-Based Thin Films The preparation method in this embodiment is the same as in Example 1, except that phosphate starch is used as the substrate, while other conditions remain the same. Performance results are shown in Table 1.

[0039] Example 3: Preparation of acetylated distarch phosphate-based thin films The preparation method in this embodiment is the same as in Example 1, except that acetylated distarch phosphate is used as the base material, while other conditions remain the same. Performance results are shown in Table 1.

[0040] Comparative Example 1: Ordinary corn starch was used as the base material without esterification modification, and the preparation method was the same as in Example 1. The performance results are shown in Table 1.

[0041] This invention presents a systematic performance test of starch-based composite films, including characterization of the films' basic properties and evaluation of their functional performance in food preservation applications. All tests adhered to international or national standards to ensure the reliability and comparability of the data. The test methods and results are as follows: 1. Thin film mechanical property testing Tensile strength (TS): Measured using a Labthink intelligent electronic tensile testing machine according to ASTM-D882-12 at 25°C and 90% relative humidity. A strip-shaped film sample (15mm × 100mm) was placed between the clamps with an initial clamp distance of 60mm, and the testing speed was 50mm / min. The results are expressed in MPa, characterizing the tensile strength of the film.

[0042] Elongation at break (EAB): Performed simultaneously with the TS test, the percentage of elongation (%) at which the film breaks is calculated, reflecting the flexibility and toughness of the film.

[0043] 2. Thin Film Barrier Performance Testing Oxygen permeability (OTR): Measured using a differential pressure gas permeameter (G2 / 132) according to ASTM D1434-82 at 23°C and 50% relative humidity. The sample was cut into a circle, and the pressure differential in the test chamber was set to 0.1 MPa. Results are expressed in cm⁻¹. 3 / m 2 •24h•0.1MPa indicates that the oxygen barrier properties of the membrane are being evaluated.

[0044] Water vapor transmission rate (WVTR): Measured using a weighted water vapor transmission rate tester (WB-31E, LabStone) at 38℃ and 90% relative humidity. Samples were cut into 80mm diameter circles. Results are expressed in g / m³. 2 •24h indicates the moisture-proof performance of the film.

[0045] Oil absorption rate: The oil-resistant ability is evaluated by oil adsorption. A 1cm×2cm film sample is immersed in 2mL of edible oil for 72h. After removal, the surface oil is wiped off, and the mass gain percentage (%) is calculated to reflect the oil resistance of the film.

[0046] 3. Thin film surface property testing Contact angle: Using a contact angle tester (SDC100), 4 μL of distilled water was dropped onto the membrane surface, and the shape of the water droplet was captured immediately. The contact angle (°) was measured using the five-point fitting method to evaluate the hydrophilicity / hydrophobicity of the membrane.

[0047] Moisture content (MC): Dry the 5cm×5cm film sample at 105℃ to constant weight and calculate the percentage of mass loss (%). The formula is MC(%) = (M1 - M2) / M1 × 100%, where M1 is the initial mass and M2 is the mass after drying.

[0048] Swelling degree: The film sample is immersed in water, the mass change before and after immersion is measured, and the swelling percentage (%) is calculated to characterize the water absorption and swelling of the film.

[0049] 4. Thin film structure performance testing Fourier Transform Infrared Spectroscopy (FTIR): Using an FTIR spectrometer (Nicolet iS10), at 4000-400 cm⁻¹ -1 The range was scanned 64 times to analyze changes in functional groups and short-range order.

[0050] X-ray diffraction (XRD): Using an XRD instrument (Rigaku Ultima IV), scan in the range of 3-60° (2θ) with a step size of 0.02°, calculate the relative crystallinity (RC%), with the formula RC% = (A1 / A0) × 100%, where A1 is the area of ​​the crystal diffraction peak and A0 is the total area.

[0051] 5. Thin Film Optical Performance Testing Transmittance: The transmittance (%) of the film in the visible light region was measured using an optical tester (WGT-S) to evaluate transparency.

[0052] Haze: Simultaneous transmittance test, haze (%) is calculated to characterize the haziness of the film.

[0053] Ultraviolet transmittance: Scan within the wavelength range of 200-800nm ​​to measure the transmittance (%) in the ultraviolet region and evaluate the ability to block ultraviolet rays.

[0054] 6. Preservation performance test (oxidative stability of avocado oil) Five experimental groups were set up, including an exposed group (without film packaging, labeled K), film-packaged groups of Examples 1-3 (acetic acid starch, phosphate starch, acetylated distarch phosphate), and a film-packaged group of ordinary corn starch (Comparative Example 1), with three replicates in each group. Freshly extracted avocado oil (extraction steps included washing, peeling, deseeding, mixing, and drying) was packaged into film bags, 50±1g per bag, and subjected to accelerated oxidation experiments in a 60℃ incubator. Samples were taken for testing on days 0, 1, 2, 3, 4, 5, 10, 15, and 20. The following indicators were measured periodically: Acid value (AV): Titrated using standard methods, it calculates the number of milligrams of KOH consumed per gram of oil (mg KOH / g), reflecting the degree of hydrolysis and rancidity of the oil.

[0055] Peroxide value (POV): Measured by iodometric titration, measured in meq / kg, characterizing the content of primary oxidation products.

[0056] TBA value: Measures the content of thiobarbituric acid reactants, in ppm, reflecting the content of secondary oxidation products (such as malondialdehyde).

[0057] Color parameters: Using a colorimeter, measure L (brightness), a (red-green hue), and b* (yellow-blue hue), and calculate the total color difference ΔE to evaluate the color change of the oil.

[0058] Chlorophyll content: The absorbance was measured at 630 nm and 710 nm, and the chlorophyll content (mg / kg) was calculated according to the formula, which reflects the degradation of chlorophyll in the oil.

[0059] The performance test results are summarized in Table 1, which shows a comparison of the comprehensive performance of different esterified starch films.

[0060] Table 1. Thin film performance test results of Examples 1-3 and Comparative Example 1 As shown in Table 1, esterification modification significantly improves film performance: acetate and phosphate-based films have high tensile strength and low OTR, making them suitable for high barrier requirements; acetylated distarch phosphate-based films have the best flexibility, but a higher OTR.

[0061] The results of the avocado oil preservation performance test are as follows: Figure 4-8 As shown: (1) Changes in oxidation index Figure 4 Acid value analysis showed that the acid value of the blank control group reached its peak on day 10 (23 mg KOH / g), while the acid values ​​of all experimental groups were significantly lower than this value throughout the storage period. Among them, the acetate starch film group achieved the lowest acid value of all samples on day 15 (2.281 mg KOH / g), highlighting the advantage of acetyl groups in inhibiting hydrolytic rancidity. Although the dynamic change patterns of acid value differed among all esterified film groups (e.g., acetate starch film and acetylated distarch phosphate film showed wave-like fluctuations, while ordinary corn starch film and phosphate starch film showed an initial decrease followed by an increase), their final values ​​remained at a low level. The maximum value of the phosphate starch film group on day 20 (3.74 mg KOH / g) was only 16.3% of the peak value of the blank control group, fully demonstrating the effective control of oil hydrolysis by esterified films. Figure 5 Regarding peroxide value, the acetylated distarch phosphate film group showed the lowest value (6.4 meq / kg) on ​​day 5 of storage, demonstrating good initial oxygen barrier ability. With prolonged storage, the characteristics of different films differentiated significantly: by day 10 and day 20, the peroxide value of the phosphate starch film group decreased to the lowest (0.4333 meq / kg and 0.2333 meq / kg, respectively), indicating that its phosphate groups had a significant and sustained effect on scavenging or inhibiting peroxides. Throughout the entire storage period, the POV of all experimental groups was significantly lower than that of the blank control group (Group K), confirming the general effectiveness of esterification modification. Figure 6 In the TBA value results, the ordinary corn starch film showed the lowest TBA values ​​on days 5 and 20 (0.2447 ppm and 0.2401 ppm, respectively), demonstrating stable baseline barrier performance. The phosphate starch film showed the lowest value on day 15 (0.3029 ppm). Notably, the acetylated distarch phosphate film group exhibited the most stable TBA value throughout the storage period, especially in the later stages (0.3241 ppm on day 20), indicating that its dual-modified structure provides a balanced and long-lasting inhibition of the lipid peroxidation chain reaction. The TBA value of the blank control group was significantly higher than that of all film groups at all time points (P<0.01), reaching a maximum of 3.18 times that of the experimental group.

[0062] (2) Color and chlorophyll stability Figure 7Color parameters showed that throughout the storage period, the color changes in all starch film-packaged groups were significantly less than those in the blank control group (P<0.01), demonstrating that film packaging effectively delayed the overall color deterioration. Specifically, the ΔE value of acetate starch film was consistently the lowest among all experimental groups during the early and middle stages of storage (days 5, 10, and 15), indicating its most stable color. Notably, by day 20, the ΔE value of acetylated distarch phosphate film decreased to the lowest (3.325), showing excellent long-term color retention potential. The ΔE value of the blank control group was the highest at all time points, and on day 20, it was significantly higher than all film groups (P<0.01), which visually confirms the rapid color decay of oils in the unpackaged state. Figure 8 Chlorophyll content analysis showed that the blank control group suffered extremely severe chlorophyll loss, with the content dropping to 0.0425 mg / kg by day 10. In contrast, all starch films significantly slowed chlorophyll degradation. Among them, the acetate starch film exhibited the best color retention performance, with its chlorophyll content reaching the highest value among all groups on day 5 (8.742 mg / kg, 18.8 times that of the blank control group at the same time point), and maintaining its leading position throughout the later stages of storage, ultimately achieving the highest content.

[0063] (3) In summary, different esterification modification strategies have brought differentiated preservation functions to starch films. Acetate starch films showed the best performance in inhibiting acid value rise and maintaining chlorophyll stability, with outstanding comprehensive antioxidant properties. Phosphate starch films showed the best inhibitory power against peroxide accumulation in the middle and late stages of storage, and had a good balance between mechanical and barrier properties. Acetylated distarch phosphate films, with their dual-modification structure, brought a balanced oxidative inhibition effect, with stable TBA value changes, showing good control over the entire lipid oxidation process. Ordinary corn starch films, as a control, showed significantly better basic barrier function than the unpackaged blank group, but were weaker than esterified modified films in most indicators. All esterified film groups significantly delayed the oxidative deterioration of avocado oil, extending shelf life by about 30%, which was better than traditional packaging. The above experiments confirm that the esterified modified starch-based films of the present invention, by regulating multi-scale structures, achieve synergistic optimization of barrier-mechanical-antioxidant properties, providing an innovative solution for oil preservation. The present invention is not limited to the above embodiments. Those skilled in the art can adjust the parameters and processes without departing from the core of the present invention, and these modifications all fall within the protection scope of the present invention.

[0064] The above description of the embodiments is intended to enable those skilled in the art to understand and use the present invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the principles of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. A starch-based material based on esterification modification, characterized in that, It is prepared by melt blending esterified starch, plasticizer and nano silica.

2. The starch-based material according to claim 1, characterized in that, The mass ratio of the esterified starch, plasticizer, and nano-silica is 1:0.1-0.5:0.01-0.

05. The esterified starch is selected from at least one of acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch, and alkenyl succinate starch. The plasticizer is selected from polyethylene glycol and sorbitol.

3. The starch-based material according to claim 1, characterized in that, Starch-based materials can take the form of strips, granules, flakes, or films.

4. A method for preparing a starch-based material based on esterification modification, characterized in that, The steps include: Esterified starch, plasticizer, and nano-silica are melt-blended and extruded to obtain starch-based materials in strip or granular form.

5. The preparation method according to claim 4, characterized in that, It also includes obtaining sheet or film starch-based materials by melt extrusion casting or hot pressing of granular starch-based materials.

6. The preparation method according to claim 4, characterized in that, The mass ratio of the esterified starch, plasticizer, and nano-silica is 1:0.1-0.5:0.01-0.

05. The esterified starch is selected from at least one of acetate starch, phosphate starch, acetylated distarch phosphate, sulfate starch, propionate starch, citrate starch, and alkenyl succinate starch. The plasticizer is selected from polyethylene glycol and sorbitol.

7. The starch-based material according to any one of claims 1-3 or the starch-based material prepared by the preparation method according to any one of claims 4-6 is used for anti-oxidation of oils or anti-photo-oxidative degradation of chlorophyll, or for preparing packaging products for anti-oxidation of oils, or for preparing packaging products containing oils or chlorophyll.

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 preparation method according to any one of claims 4-6, selected from any one of the following: (1) Products for packaging oils and fats with antioxidant properties; (2) Packaging products containing oils or chlorophyll.

9. The packaging product according to claim 8, characterized in that, The packaging products are selected from any one of cans, bottles, bags, rolls, boxes, cartons, and films.

10. The packaging product according to claim 8, characterized in that, The oil- or chlorophyll-containing products are selected from any one of the following: fruits, vegetables, nuts, meats, and flowers containing oil or chlorophyll.

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