Table 1.
Total phenolic contents, total flavonoid contents, and antioxidant capacities of various coffee products commercially available in Korea
| Types | Total phenolics (mg GAE/g DW) | Total flavonoids (mg CE/g DW) | Antioxidant capacities (mg VCE/g DW) | |
|---|---|---|---|---|
| DPPH | ABTS | |||
| Instant coffee | ||||
| Brand A | 94.2 ± 9.4e,f,g1 | 61.1 ± 0.4e,f,g,h | 96.9 ± 15.7e,f,g | 134.5 ± 4.7i |
| Brand B | 110.0 ± 4.1c,d | 70.6 ± 2.3c,d | 109.5 ± 3.3d,e,f | 152.7 ± 4.5 h,i |
| Brand C | 103.3 ± 8.4c,d,e | 66.3 ± 1.7c,d,e | 104.8 ± 10.7d,e,f,g | 148.1 ± 11.0 h,i |
| Brand D | 102.9 ± 6.9c,d,e | 59.6 ± 2.8e,f,g,h | 108.6 ± 5.4d,e,f | 154.6 ± 13.0 h,i |
| Brand E | 129.5 ± 6.9a | 81.1 ± 3.8b | 141.9 ± 7.7b,c | 200.4 ± 16.6a,b,c |
| Brand F | 122.0 ± 9.6a,b | 85.9 ± 5.0b | 138.1 ± 4.1c | 217.1 ± 24.5a |
| Brand G | 123.5 ± 9.0a,b | 62.1 ± 1.0e,f,g | 155.5 ± 7.9b | 182.9 ± 9.4b,c,d,e,f |
| Brand H | 128.2 ± 2.4a | 59.8 ± 0.6e,f,g,h | 159.2 ± 8.8b | 189.6 ± 15.9b,c,d |
| Brand I | 129.8 ± 0.2a | 60.5 ± 2.5e,f,g,h | 184.0 ± 32.0a | 203.4 ± 8.8a,b |
| Brand J | 128.2 ± 2.7a | 57.4 ± 1.8 g,h | 156.4 ± 9.6b | 204.0 ± 2.8a,b |
| Decaffeinated instant coffee | ||||
| Brand K | 110.4 ± 5.7c,d | 72.6 ± 2.6c | 118.0 ± 8.2d | 185.8 ± 5.2b,c,d,e |
| Brand L | 101.6 ± 11.7d,e | 65.3 ± 2.6d,e,f | 113.6 ± 8.9d,e | 170.4 ± 16.0d,e,f,g,h |
| Roasted coffee2 | ||||
| Brand M | 26.3 ± 0.5h | 14.1 ± 0.3i | 19.6 ± 1.4h | 26.1 ± 0.2j |
| Brand N | 26.1 ± 0.1h | 15.1 ± 0.4i | 19.0 ± 1.1h | 25.1 ± 0.4j |
| Coffee mix | ||||
| Brand O | 85.5 ± 3.6g | 54.6 ± 4.8h | 91.5 ± 5.3f,g | 164.8 ± 19.9e,f,g,h |
| Brand P | 93.9 ± 5.6e,f,g | 55.4 ± 4.3g,h | 89.4 ± 5.6g | 159.7 ± 8.2g,h |
| Brand Q | 99.1 ± 3.5d,e,f | 59.8 ± 1.3e,f,g,h | 100.7 ± 4.1d,e,f,g | 165.5 ± 7.6e,f,g,h |
| Brand R | 86.7 ± 5.5g | 59.4 ± 9.6f,g,h | 93.8 ± 9.2f,g | 151.8 ± 15.7h,i |
| Brand S | 113.6 ± 8.9b,c | 81.2 ± 4.1b | 113.7 ± 7.3d,e | 179.2 ± 8.9c,d,e,f,g |
| Brand T | 101.6 ± 7.9d,e | 70.1 ± 5.7c,d | 109.3 ± 6.6d,e,f | 180.8 ± 7.2c,d,e,f,g |
| Brand U | 88.4 ± 4.4f,g | 104.4 ± 4.9a | 102.0 ± 6.6d,e,f,g | 162.8 ± 6.0f,g,h |
| Mean | ||||
| Instant coffee | 117.2 ± 13.3 | 66.4 ± 9.8 | 135.5 ± 29.1 | 178.7 ± 28.8 |
| Decaffeinated instant coffee | 106.0 ± 6.2 | 68.9 ± 5.2 | 115.8 ± 3.1 | 178.1 ± 10.9 |
| Roasted coffee | 26.2 ± 0.2 | 14.6 ± 0.7 | 19.3 ± 0.5 | 25.6 ± 0.7 |
| Coffee mix | 95.5 ± 10.1 | 69.3 ± 18.1 | 100.1 ± 9.2 | 166.4 ± 10.3 |
1Data are presented as the mean ± standard deviation (n = 3). Different superscript letters in the same column for each type of coffee product indicate the significant differences by Duncan’s multiple range test (p < 0.05)
2Data modified from Lim et al. (2012)