Impact Of Drying Methods On The Color Characteristics Of Cistanche Extracts
Aug 25, 2025
2 Results and Analysis
2.1 Effect of Gas Jet Impingement Drying Conditions on the Color of Cistanche
The color images of the processed Cistanche samples were captured using a scanner and converted into numerical values. The results are shown in Table 2. In the RGB mode, higher values indicate a lighter color, meaning the lighter the color of the Cistanche slices, the better their quality.
Table 2: Color Parameters of Cistanche Samples Under Different Conditions
Below is the table with color values represented visually:
| Sample No. | A: Temperature (°C) | B: Wind Speed (m/s) | C: Thickness (mm) | R (Red) | G (Green) | B (Blue) | RGB Total |
|---|---|---|---|---|---|---|---|
| 1 | 60 | 10 | 1 | #b39d5d 179 | #b39d5d 157 | #b39d5d 126 | 462 |
| 2 | 60 | 10 | 2 | #b99462 176 | #b99462 154 | #b99462 128 | 458 |
| 3 | 65 | 11 | 1 | #c1a06b 175 | #c1a06b 155 | #c1a06b 132 | 463 |
| 4 | 65 | 11 | 2 | #c19e68 174 | #c19e68 153 | #c19e68 128 | 455 |
| 5 | 70 | 12 | 1 | #9a7a4b 154 | #9a7a4b 132 | #9a7a4b 93 | 379 |
| 6 | 70 | 12 | 2 | #d9ba90 188 | #d9ba90 159 | #d9ba90 112 | 459 |
| 7 | 70 | 12 | 3 | #854e2f 125 | #854e2f 98 | #854e2f 63 | 286 |
| Natural Drying | - | - | - | #9a7a4b 155 | #9a7a4b 123 | #9a7a4b 96 | 374 |
| Oven Drying | - | - | - | #9a7a4b 155 | #9a7a4b 123 | #9a7a4b 89 | 367 |
Cistanche Raw Materials Cleaning
2.2 Effect of Gas Jet Impingement Drying Conditions on the Effective Component Content of Cistanche
The galactitol content of naturally dried and oven-dried Cistanche samples was similar. Echinacoside was detected in trace amounts in oven-dried samples, but not in naturally dried samples. Jet impingement drying resulted in higher galactitol retention compared to natural and oven drying methods, indicating its superiority in preserving galactitol content.
Below is the table summarizing effective component content:
Cistanche tubulosa extract from fresh high-content Cistanche
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Table 3: Effective Component Content of Cistanche Samples Under Different Conditions
| Sample No. | A: Temperature (°C) | B: Wind Speed (m/s) | C: Thickness (mm) | Echinacoside (mg/g) | Acteoside (mg/g) | Galactitol (mg/g) |
|---|---|---|---|---|---|---|
| 1 | 60 | 10 | 1 | 0 | 0 | 93.63 |
| 2 | 60 | 10 | 2 | 0 | 0 | 84.86 |
| 3 | 65 | 11 | 1 | 0 | 0 | 94.07 |
| 4 | 65 | 11 | 2 | 0 | 0 | 92.65 |
| 5 | 70 | 12 | 1 | 0 | 0 | 85.17 |
| 6 | 70 | 12 | 2 | 0 | 0 | 86.17 |
| 7 | 70 | 12 | 3 | 0 | 0 | 80.17 |
| Natural Drying | - | - | - | 0 | 0 | 94.07 |
| Oven Drying | - | - | - | 0 | 0 | 1.09 |
