GC-MS analysis results of volatile compounds in 7 Dayi Pu-erh tea samples.

aRI, retention indices as determined on HP-5MS column using the homologous series of n-alkanes. bCompounds are listed in order of retention time. cMethod of identification: MS, identification by comparison with mass spectra; RI, identified by retention indices. dRelative content, percent normalised peak areas; “—” not found or Relative percentage content <0.1%. emass spectral ions (relative abundance in %): unknown-1: m/z = 129 (100), 154 (98), 69 (82), 139 (80), 55 (73), 41 (64), 115 (39), 98 (35), 83 (23); unknown-2: m/z = 43 (100), 105 (87), 147 (82), 91 (66), 131 (44), 190 (40), 119 (37), 175 (36), 77 (33), 55 (29), 160 (17); unknown-3: m/z = 83 (100), 111 (45), 55 (33), 43 (14), 182 (13), 170 (10). GC-MS analysis results of volatile compounds in 7 Dayi Pu-erh tea samples.