18H-E (aged voucher material)
(University of New England)
Collection:
A small sample of dried leaf material (~0.02g) was removed from herbarium vouchers maintained at the N.C.W. Beadle Herbarium (University of New England, Armidale) and placed in glass vials containing ~ 1 mL MeOH. Material was left to extract for 24 h, frozen (~-18 °C) and sonicated for 80 min with gentle heating (~50 °C) before being filtered. Extracts were diluted with further MeOH as necessary. Batches were injected into the GC-MS in batches for characterization, or frozen until characterization.
GC–MS:
Agilent GC System 7890A; inert MSD with triple-axis detector 7975C; Agilent HP-5MS column (30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min). To limit the impact of solvent-related peaks, peaks prior to a retention time of 3.5 min were not considered in analyses.
Analysis:
Spectra were matched to the NIST11 library and a small private Eremophila compound library maintained at the University of New England. The top 10 peaks were selected, and arithmetic (retention) indices (AI) calculated and compared to the NIST Webbook (http://webbook.nist.gov/chemistry/). An annotation was rejected if the AI (+/-2%) did not match published values for nonpolar column data. If the quality match of the spectra to the NIST11 or private library was under 80% the annotation was rejected. Where no published AI was available, a compound was accepted if the quality of the spectra match was 90% or over.
18H-E:97
AI 927
2%
9%
21%
3%
15%
13%
17%
2%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:98
AI 907
3%
8%
5%
13%
14%
8%
3%
4%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:128
2%
2%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:107
10%
34%
4%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:21
AI 1100
3%
15%
3%
46%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:99
AI 1503
1%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:101
AI 934
21%
2%
2%
4%
11%
3%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:111
AI 934
20%
4%
8%
14%
2%
13%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:102
2%
2%
1%
52%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:137
12%
6%
8%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:103
AI 1316
14%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:116
AI 1959
1%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:117
AI 934
7%
27%
17%
11%
10%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:75
AI 934
4%
7%
5%
4%
3%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:122
AI 1316
3%
6%
5%
12%
26%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.
18H-E:126
6%
4%
3%
GC: HP-5MS; 30 m × 250μm× 0.25μm; He; 50 °C for 0 min, 5 °C/min to 260 °C, hold 2 min.