Preparation and Properties of Rice Starch Film

doi:10.19894/j.issn.1000-0518.220004

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (11): 1693-1702.DOI: 10.19894/j.issn.1000-0518.220004

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Preparation and Properties of Rice Starch Film

Jing-Wen WANG, Ya-Wen LYU, Ya-Zhuo SHANG(), Hong-Lai LIU

Laboratory of Cosmetics，School of Chemistry & Molecular Engineering，East China University of Science and Technology，Shanghai 200237，China

Received:2022-01-05 Accepted:2022-07-06 Published:2022-11-01 Online:2022-11-09
Contact: Ya-Zhuo SHANG
About author:shangyazhuo@ecust.edu.cn
Supported by:
the National Natural Science Foundation of China(21476072)

Abstract

Abstract:

Rice starch particles have small and uniform particle size， good dispersibility in water and film-forming property， and can be degraded in nature. At present， starch is widely used in food packaging， medical dressings and cosmetics industries. Using rice starch as raw material， sodium hydroxide as paste， glycerol as plasticizer and citric acid as crosslinking agent and solution pH regulator， starch film was prepared by tape casting. By measuring the morphology of starch particles， the gelatinization conditions of starch particles， gelatinization temperature， apparent viscosity and pH value of starch solution， mechanical properties， light transmittance and potassium glycyrrhizinate release performance of starch film tostudy the gelatinization conditions of rice starch， the effects of mass fractions of citric acid， starch and glycerol on the properties of starch film and the release of carrier substances. The results show that the rice starch used in this paperexists in the state of dispersed particles， and the gelatinization temperature ranges from 82.5 to 100.8 ℃.Citric acid interacts with starch molecules in the process of starch film formation， and can adjust the pH value of the solution to adapt to human skin. When the concentration of starch in the starch film becomes higher， the hardness after film formation is greater. The higher the concentration of glycerol， the better the elongation at break of starch film and the worse the tensile strength. In addition， the transmittance of starch film is the best when the concentration is 3.0%， which with good light transmittance has low crystallinity. Finally， the starch film prepared in this paper can contain the effective substance dipotassium glycyrrhizinate， which can be used as a skin repair film in cosmetics.

Key words: Starch film, Gelatinization, Plasticizer, Crosslinking agent, Skin care

CLC Number:

O636

Jing-Wen WANG, Ya-Wen LYU, Ya-Zhuo SHANG, Hong-Lai LIU. Preparation and Properties of Rice Starch Film[J]. Chinese Journal of Applied Chemistry, 2022, 39(11): 1693-1702.

Figures/Tables 11

Fig.1 SEM images of starch granules （A） and starch film （B）

Fig.2 Ordinary microscope （A） and polarizing microscope （B） of starch granules （the Maltese cross of starch granulesare circled by the red line）

Fig.3 DSC curve of starch gelatinization

Table 1 pH of starch solution prepared with different mass fraction of citric acid

组别

Group

柠檬酸质量分数

w（citric acid）/%

淀粉溶液pH

pH of starch solution

Fig.4 Relationship between viscosity and shear rate of starch solution with different mass fraction of citric acidw（citric acid）/%： C1. 0.0； C2. 0.3； C3. 0.4； C4. 0.5； C5. 0.6； C6. 0.7

Fig.5 Starch film samples prepared with different mass fractions of starchw（starch）/%： S1. 8； S2. 9； S3. 10； S4. 11； S5. 12

Table 2 Elongation at break and tensile strength of starch film with different mass fractions of starch

组别 Group	S1	S2	S3	S4	S5
淀粉质量分数 w（starch）/%	8.00	9.00	10.00	11.00	12.00
膜厚度 Film thickness/mm	0.34±0.03	0.33±0.01	0.34±0.01	0.33±0.04	0.34±0.03
断裂伸长率 Elongation at break/%	138.31±2.44	135.40±3.13	85.58±2.01	83.59±1.96	70.28±2.59
拉伸强度 Tensile strength/MPa	0.25±0.04	0.34±0.04	0.55±0.04	0.61±0.02	0.94±0.02

Fig.6 Starch film samples prepared with different mass fractions of glycerolw（glycerol）/%： G1. 3； G2. 4； G3. 5； G4. 6； G5. 7

Table 3 Elongation at break and tensile strength of starch films with different mass fractions of glycerol concentrations

组别 Group	G1	G2	G3	G4	G5
甘油质量分数 w（Glycerol）/%	3.00	4.00	5.00	6.00	7.00
膜厚度 Film thickness/mm	0.44±0.06	0.44±0.05	0.46±0.02	0.46±0.03	0.44±0.04
断裂伸长率 Elongation at break/%	83.59±0.93	95.84±2.44	97.27±1.76	100.95±1.23	108.34±2.22
拉伸强度 Tensile strength/MPa	1.29±0.05	1.10±0.02	0.61±0.04	0.40±0.07	0.24±0.05

Table 4 Transmittance of starch films with different glycerol mass fraction of at different wavelengths

组别 Group	甘油质量分数w（glycerol）/%	透光率 Transmittance/%
组别 Group	甘油质量分数w（glycerol）/%	λ=400 nm	λ=500 nm	λ=600 nm	λ=700 nm	λ=800 nm
G1	3	9.07±0.84	25.03±0.37	37.42±0.97	46.57±1.52	53.35±1.11
G2	4	4.36±0.61	14.49±0.92	23.72±0.55	31.77±0.46	39.09±0.76
G3	5	2.83±0.42	9.27±0.97	15.97±1.23	22.73±1.51	27.44±1.33
G4	6	2.45±0.31	7.90±0.85	14.53±0.57	20.76±0.88	26.89±0.57
G5	7	3.11±0.27	9.72±0.93	17.23±0.84	25.03±0.50	32.07±1.04

Fig.7 Study on properties of starch film sample S6 added with dipotassium glycyrrhizinate（A），（B） Physical drawing of sample picture；（C） UV absorption diagram of dipotassium glycyrrhizinate solution with different mass fraction （The mass concentration： 0.001， 0.005， 0.010， 0.050 and 0.100 mg/mL） and standard curve obtained by fitting；（D） Curve of release of dipotassium glycyrrhizinate in sample with time

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Preparation and Properties of Rice Starch Film

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