Concomitant Use of Fourier Transform Infrared Attenuated Total Reflectance Spectroscopy and Chemometrics for Quantification of Multiple Adulterants in Roasted and Ground Coffee

Table 1

Mass composition of adulterated coffee samples.

Samples	Adulteration level (%)	⁢Mass fraction (%)
		Coffee	Spent coffee grounds	Coffee husks	Barley	Corn
1	66	33.3		33.3		33.3
2	50	50		50
3	50	50				50
4	40	60	10	10	10	10
5	40	60		20		20
6	40	60	20		20
7	20	80	5	5	5	5
8	20	80		10		10
9	20	80	10		10
10	10	90		5		5
11	10	90	5		5
12	10	90	3.33	3.33		3.33
13	10	90	10
14	10	90		10
15	10	90			10
16	10	90				10
17	1	99	1
18	1	99		1
19	1	99			1
20	1	99				1
21	2	98		1		1
22	2	98	1		1
23	2	98	1	1
24	2	98			1	1
25	4	96	1	1	1	1
26	4	96			2	2
27	4	96	2	2
28	8	92	2	2	2	2
29	8	92	4			4
30	8	92		4	4
31	0.5	99.5				0.5
32	0.5	99.5		0.5
33	0.5	99.5			0.5
34	0.5	99.5	0.5