Table 4.

Showing Relative area% of identified volatile compounds of HPMC coating with control (uncoated roasted coffee beans)

HPMC Coating
RT-GC	Compound identified	Period after coating (Area %) (1 week)		Period after coating (Area %) (1 month)		Period after coating (Area %) (2 months)
		Control	HPMC	Control	HPMC	Control	HPMC
2.23	2-3, Pentanedione	>1	>1	2.62	3.10	>1	2.90
4.39	PYRIDINE	19.47	18.42	18.84	20.76	24.04	20.95
6.56	3 (2H)-Furanone, dihydro-2-methyl-	3.76	5.59	3.19	4.08	3.67	4.63
7.3	Methylpyrazine	9.18	9.40	7.64	8.30	8.72	9.28
7.8	Furfural	3.37	6.26	2.69	3.92	3.16	3.85
9.69	2- furanmethanol	35.39	30.58	21.34	25.27	19.17	25.98
10.5	2- Propanone, 1-(acetyloxy)-	1.61	1.25	1.12	1.39	>1	1.61
13.60	Ethanone, 1-(2-furanyl)	4.12	4.88	8.39	7.00	7.86	8.21
19.47	2- Furancarboxaldehyde, 5-methyl	4.82	8.06	3.37	4.47	3.77	5.27
24.91	2- Furanmethanol, acetate	3.67	1.34	2.28	>1	2.20	2.54
39.88	Phenol, 2-methoxy-	1.41	>1	1.75	2.01	2.0	1.92
51.98	1H- Pyrrole, 1-(2-furanylmethyl)-	1.68	1.52	1.90	1.88	>1	>1
57.91	Phenol, 4-Ethenyl-2-Methoxy-	3.72	3.83	1.17	1.03	2.13	2.88
61.02	Pyridine, 2-chloro-6-(2-furanylmethoxy)-4-(trichloromethyl)-	1.05	1.29	2.01	2.69	>1	>1