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. 2020 Jun 2;9(6):713. doi: 10.3390/foods9060713

Table 2.

Contents (µg g−1 of dry weight extract) of bioactive compounds in SCG (spent coffee ground) and CS (coffee silverskin) extracts.

Spent Coffee Ground Extracts (µg g−1) Silverskin Extracts (µg g−1)
No. Analytes 1 MeOH H2O MeOH:H2O (50:50) EtOH:H2O (70:30) MeOH H2O MeOH:H2O (50:50) EtOH:H2O (70:30)
1 Shikimic acid n.d.3 n.d. n.d. n.d. n.d. n.d. n.d. n.d.
2 Gallic acid 42.45 ± 3.20 53.42 ± 4.10 51.90 ± 3.95 57.47 ± 5.03 32.65 ± 2.92 38.16 ± 1.58 43.25 ± 2.97 44.21 ± 3.45
3 5-CQA 2 9786.20 ± 815.36 4660.85 ± 254.32 10,613.61 ± 901.24 8620.83 ± 756.31 5436.78 ± 278.35 2589.36 ± 132.69 5896.45 ± 214.35 4789.35 ± 297.63
4 (+)-Catechin 1.23 ± 0.10 0.85 ± 0.06 1.56 ± 0.12 1.37 ± 0.10 n.d. n.d. n.d. n.d.
5 Del-3,5-diglu 2 n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
6 3-CQA 2 3377.82 ± 156.32 2091.89 ± 154.78 2736.86 ± 203.12 3777.65 ± 306.69 2598.32 ± 178.35 1549.55 ± 115.21 2657.15 ± 199.78 2698.32 ± 237.78
7 Caffeine 32,838.17 ± 2569.11 44,755.37 ± 3251.45 45,857.23 ± 4016.98 54,440.27 ± 4875.19 27,365.14 ± 1023.65 31,968.12 ± 1548.47 38,214.36 ± 1689.53 41,877.13 ± 2356.30
8 Cya-3-glu 2 1.56 ± 0.12 0.93 ± 0.08 1.65 ± 0.13 1.89 ± 0.15 n.d. n.d. n.d. n.d.
9 Vanillic acid 86.61 ± 5.36 95.28 ± 8.21 140.38 ± 10.32 119.39 ± 9.96 96.23 ± 5.68 105.87 ± 9.23 116.98 ± 9.65 132.65 ± 10.65
10 Caffeic acid 67.98 ± 4.12 118.03 ± 8.65 156.60 ± 9.21 204.95 ± 15.45 45.32 ± 2.41 98.36 ± 5.68 142.36 ± 11.32 157.65 ± 10.56
11 (-)-Epicatechin n.d. n.d. n.d. n.d. 123.65 ± 10.63 n.d. 102.98 ± 8.65 n.d.
12 Syringic acid 33.65 ± 1.23 50.83 ± 4.56 50.26 ± 5.21 94.20 ± 8.32 n.d. 42.36 ± 2.63 45.69 ± 3.58 85.64 ± 6.82
13 p-Coumaric acid 7.10 ± 0.65 10.62 ± 1.03 13.30 ± 1.22 22.09 ± 1.98 5.46 ± 0.36 9.65 ± 0.79 10.23 ± 0.95 15.78 ± 1.03
14 Ferulic acid 55.36 ± 4.32 65.31 ± 5.36 125.36 ± 9.56 136.98 ± 11.54 38.69 ± 2.32 62.65 ± 4.01 97.69 ± 6.41 145.32 ± 10.85
15 3,5-diCQA 2 879.32 ± 65.32 852.36 ± 75.75 753.84 ± 54.21 1194.62 ± 98.96 115.63 ± 11.21 125.65 ± 8.95 358.97 ± 22.41 459.47 ± 49.8
16 Quinine 1.23 ± 0.09 1.56 ± 0.12 2.12 ± 0.19 3.65 ± 0.25 0.68 ± 0.02 0.71 ± 0.02 0.87 ± 0.03 0.93 ± 0.03
17 Naringin 0.36 ± 0.02 0.52 ± 0.04 0.31 ± 0.02 0.51 ± 0.03 n.d. 0.45 ± 0.03 n.d. 0.39 ± 0.02
18 Rutin 2.36 ± 0.15 3.54 ± 0.26 5.23 ± 0.47 9.65 ± 0.87 1.25 ± 0.06 2.65 ± 0.13 6.35 ± 0.54 10.65 ± 0.85
19 Hyperoside 0.65 ± 0.05 0.32 ± 0.02 0.54 ± 0.03 0.87 ± 0.06 0.56 ± 0.03 0.40 ± 0.02 0.59 ± 0.04 0.52 ± 0.02
20 Trans-cin acid 2 1.98 ± 0.12 2.35 ± 0.20 3.21 ± 0.31 4.95 ± 0.36 1.23 ± 0.04 2.56 ± 0.13 2.65 ± 0.14 4.87 ± 0.24
21 Resveratrol n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
22 Kae-3-glu 2 0.59 ± 0.03 0.47 ± 0.02 1.40 ± 0.09 1.89 ± 0.10 0.65 ± 0.04 0.36 ± 0.01 0.78 ± 0.05 1.26 ± 0.10
23 Quercitrin 0.43 ± 0.03 0.13 ± 0.01 0.62 ± 0.05 0.83 ± 0.07 0.36 ± 0.02 0.12 ± 0.01 0.41 ± 0.03 0.59 ± 0.05
24 Quercetin 3.74 ± 0.29 3.20 ± 0.28 3.76 ± 0.31 3.67 ± 0.33 3.12 ± 0.25 3.56 ± 0.25 3.42 ± 0.28 3.06 ± 0.20
25 Isogentisin 2.54 ± 0.19 1.05 ± 0.08 1.09 ± 0.09 0.99 ± 0.07 1.95 ± 0.15 0.95 ± 0.08 1.36 ± 0.11 1.10 ± 0.09
Total Compounds 47,191.31 ± 3058.21 52,768.88 ± 3658.54 60,520.82 ± 4536.41 68,698.72 ± 5012.36 35,867.67 ± 2898.32 36,601.49 ± 3025.45 47,702.54 ± 3987.36 50,428.89 ± 4023.74

1 Each sample was analyzed in triplicate (n = 3) and values are expressed as means ± S.D.; 2 3-CQA, 3-Caffeoylquinic acid; 3,5-diCQA, 3,5-Dicaffeoylquinic acid; 5-CQA, 5-Caffeoylquinic acid; Del-3,5-diglu, Delphinidin-3,5-diglucosiede; Cya-3-glu, Cyanidin-3-glucoside; Trans-cin acid, Trans-cinnamic acid; Kae-3-glu, Kaempferol-3-glucoside; 3 n.d., not detectable.