Quantification of Caffeoylquinic Acids in Coffee Brews by HPLC-DAD

Table 4

Caffeoylquinic acids (CQAs) content in various types of coffee brews^a.

Class of coffee brews	3-CQA	4-CQA	5-CQA	Total CQAs^b	As a percentage of total CQA (%)
	(mg/L)	(mg/L)	(mg/L)	(mg/L)	3-CQA	4-CQA	5-CQA
Classical coffee brews
Brews prepared; using roasted and; ground Arabica coffee
Boiled	352.57 ± 1.64	197.79 ± 2.07	194.34 ± 0.99	744.70 ± 0.54^a	47.34	26.56	26.10
French	310.97 ± 4.05	171.48 ± 1.17	163.12 ± 0.99	645.56 ± 1.71^b	48.17	26.56	25.27
Mocha	357.25 ± 15.59	198.47 ± 8.31	188.32 ± 6.30	744.04 ± 4.89^a	48.02	26.67	25.31
Filter	307.86 ± 1.97	169.72 ± 0.46	161.00 ± 1.21	638.58 ± 0.75^b	48.21	26.58	25.21
Brews prepared using; roasted and ground; Robusta coffee
Boiled	365.44 ± 6.70	199.67 ± 3.88	206.18 ± 3.59	771.29 ± 1.72^b	47.38	25.89	26.73
French	320.35 ± 6.94	172.85 ± 1.88	173.47 ± 2.11	666.67 ± 2.86^c	48.05	25.93	26.02
Mocha	421.49 ± 7.95	225.47 ± 2.85	225.97 ± 2.61	872.93 ± 3.02^a	48.28	25.83	25.89
Filter	296.83 ± 12.60	162.02 ± 3.78	165.17 ± 3.31	624.03 ± 5.23^d	47.57	25.96	26.47
Commercial coffee brews
Capsule coffees
Capsule A—type 1	818.93 ± 4.22	444.69 ± 4.78	393.20 ± 4.16	1656.82 ± 0.34^a	49.43	26.84	23.73
Capsule A—type 2	710.01 ± 3.77	420.11 ± 1.85	378.94 ± 0.66	1509.06 ± 1.57^b	47.05	27.84	25.11
Capsule A—type 3	720.50 ± 0.61	408.77 ± 4.35	370.35 ± 2.11	1499.63 ± 1.88^c	48.05	27.26	24.70
Capsule A—type 4	604.36 ± 5.05	349.22 ± 2.43	318.57 ± 1.19	1272.15 ± 1.97^e	47.51	27.45	25.04
Capsule A—type 5	369.27 ± 13.98	234.95 ± 12.49	222.08 ± 1.80	826.29 ± 6.65^f	44.69	28.43	26.88
Capsule B	356.74 ± 11.87	200.84 ± 1.15	190.8 ± 1.30	748.40 ± 6.14^g	47.67	26.84	25.50
Capsule C	688.95 ± 12.36	362.20 ± 4.86	323.64 ± 6.15	1374.78 ± 4.61^d	50.11	26.35	23.54
Other pressure methods
Vending coffee	713.64 ± 21.24	398.39 ± 3.57	409.02 ± 3.61	1521.05 ± 10.19^b	46.92	26.19	26.89
Pod espresso	823.45 ± 9.82	436.30 ± 5.64	402.30 ± 3.55	1662.01 ± 3.19^a	49.55	26.25	24.20
Espresso lab-made	551.15 ± 27.79	337.07 ± 14.93	332.13 ± 1.05	1220.35 ± 13.37^c	45.16	27.62	27.22
Instant coffees
Instant natural A	62.51 ± 2.51	51.26 ± 0.34	65.38 ± 1.15	179.16 ± 1.10^c	34.89	28.61	36.50
Instant natural B	100.22 ± 0.78	58.56 ± 2.13	68.80 ± 0.40	227.57 ± 3.31^b	44.04	25.73	30.23
Instant decaffeinated	62.78 ± 2.87	48.53 ± 2.58	60.55 ± 0.54	171.86 ± 1.27^c	36.53	28.24	35.23
Instant espresso	412.07 ± 5.26	278.46 ± 3.26	301.32 ± 2.88	991.85 ± 1.28^a	41.55	28.07	30.38
Other brews
Iced coffee	44.51 ± 5.21	27.82 ± 3.38	31.85 ± 3.50	104.19 ± 1.02^b	42.72	26.71	30.57
Iced cappuccino	17.01 ± 0.43	12.57 ± 0.39	16.21 ± 0.49	45.79 ± 0.05^a	37.14	27.46	35.40

The results correspond to the average ± standard deviation of two extractions followed by two times injection.
^bIn each class of brew, values with the same letter are not significantly different ().