Table 2.
Polyphenol content of cocoa beans dried in some active dryers.
| Drying method | Temp/°C | Total polyphenol contents/mgGAE/100 g | References | |||
|---|---|---|---|---|---|---|
| 40 hrs | 32 hrs | 24 hrs | 12 hrs | |||
| Electric oven | 60 | 51.7 ± 0.6 | 55.1 ± 1.1 | 59.4 ± 1.2 | 64.3 ± 0.3 | [31] |
| 70 | 56.3 ± 0.3 | 57.3 ± 0.4 | 62.6 ± 0.9 | 67.1 ± 0.6 | ||
| 80 | 34.7 ± 0.9 | 44.3 ± 0.6 | 48.2 ± 0.9 | 62.6 ± 0.3 | ||
| Heat pump | 28.2 | 73.9 | Drying time undefined | [34] | ||
| Hot air | Undefined | 45 ± 74 | [35] | |||
| CGHD | Varied | 75.4 ± 0.5 | Drying time, 27 hrs | This work | ||
| CTN1X | 85.0 ± 0.1 | |||||
| OSD | 82.8 ± 1.5 | |||||
| P3X | 65.4 ± 1.1 | |||||
| W1X | 72.8 ± 2.3 | |||||
CGHD: conventional greenhouse dryer; CTN1X, P3X, and W1X: modified greenhouse dryers with fleece of cotton, polyester, and wool, respectively, and OSD: open sun dryer. GAE: gallic acid equivalent; superscripts of same letters within same parameter are not significantly different, p < 0.05.