Optical Absorption and Scattering Properties at 900–1650 nm and Their Relationships with Soluble Solid Content and Soluble Sugars in Apple Flesh during Storage
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Collection and Storage
2.2. Optical Properties
2.3. SSC and Soluble Sugars Contents Measurements
2.4. Statistical Analysis
3. Results and Discussion
3.1. Validation Results of Optical Properties
3.2. Spectral Analysis
3.2.1. Absorption Coefficient
3.2.2. Reduced Scattering Coefficient
3.3. SSC and Soluble Sugars Contents
3.3.1. Changes of Contents of Soluble Solid and Soluble Sugars
3.3.2. Relationships among SSC and Soluble Sugar Contents
3.4. Optical Properties–SSC–Soluble Sugars Contents Relations
3.4.1. Absorption Coefficient–SSC–Soluble Sugars Contents Relations
3.4.2. Scattering Coefficient–SSC–Soluble Sugars Contents Relations
3.5. SSC and Soluble Sugars Contents Predictions
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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SSC | TSS | Fructose | Glucose | Sucrose | |
---|---|---|---|---|---|
SSC | 1 | 0.956 ** | 0.921 ** | 0.868 * | 0.973 ** |
TSS | \ | 1 | 0.974 ** | 0.942 ** | 0.921 ** |
Fructose | \ | \ | 1 | 0.957 ** | 0.943 ** |
Glucose | \ | \ | \ | 1 | 0.841 * |
Sucrose | \ | \ | \ | \ | 1 |
SSC | TSS | Fructose | Glucose | Sucrose | |
---|---|---|---|---|---|
SSC | 1 | 0.963 ** | 0.933 ** | 0.870 * | 0.950 ** |
TSS | \ | 1 | 0.975 ** | 0.967 ** | 0.847 * |
Fructose | \ | \ | 1 | 0.982 ** | 0.795 |
Glucose | \ | \ | \ | 1 | 0.685 |
Sucrose | \ | \ | \ | \ | 1 |
Parameters (Independent Variable x) | μa (Dependent Variable y) | Linear Fitting Equation | R2 |
---|---|---|---|
SSC | 980 nm | y = 0.0021x + 0.0383 | 0.848 |
1189 nm | y = 0.0053x +0.1039 | 0.859 | |
1498 nm | y = 0.0581x + 1.0107 | 0.915 | |
Sucrose | 980 nm | y = 0.0022x + 0.0361 | 0.850 |
1189 nm | y = 0.005x + 0.1064 | 0.880 | |
1498 nm | y = 0.036x + 1.4102 | 0.921 |
Parameters | Optical Property | Calibration | Prediction | ||
---|---|---|---|---|---|
Rc2 | RMSEC | Rp2 | RMSEP | ||
SSC | μa | 0.851 | 0.314 | 0.833 | 0.329 |
μ′s | 0.739 | 0.693 | 0.726 | 0.722 | |
Total soluble sugar | μa | 0.837 | 2.055 | 0.830 | 2.062 |
μ′s | 0.710 | 3.657 | 0.701 | 3.699 | |
Fructose | μa | 0.782 | 1.567 | 0.781 | 1.570 |
μ′s | 0.658 | 1.935 | 0.635 | 2.216 | |
Glucose | μa | 0.769 | 1.338 | 0.752 | 1.344 |
μ′s | 0.611 | 1.821 | 0.593 | 1.906 | |
Sucrose | μa | 0.860 | 1.032 | 0.851 | 1.047 |
μ′s | 0.744 | 1.437 | 0.736 | 1.458 |
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Fang, L.; Wei, K.; Feng, L.; Tu, K.; Peng, J.; Wang, J.; Pan, L. Optical Absorption and Scattering Properties at 900–1650 nm and Their Relationships with Soluble Solid Content and Soluble Sugars in Apple Flesh during Storage. Foods 2020, 9, 1881. https://doi.org/10.3390/foods9121881
Fang L, Wei K, Feng L, Tu K, Peng J, Wang J, Pan L. Optical Absorption and Scattering Properties at 900–1650 nm and Their Relationships with Soluble Solid Content and Soluble Sugars in Apple Flesh during Storage. Foods. 2020; 9(12):1881. https://doi.org/10.3390/foods9121881
Chicago/Turabian StyleFang, Li, Kangli Wei, Li Feng, Kang Tu, Jing Peng, Jiahong Wang, and Leiqing Pan. 2020. "Optical Absorption and Scattering Properties at 900–1650 nm and Their Relationships with Soluble Solid Content and Soluble Sugars in Apple Flesh during Storage" Foods 9, no. 12: 1881. https://doi.org/10.3390/foods9121881