Sample
|
Eumelanin markers
|
Pheomelanin markers
|
---|
PDCA (μg/g)
|
PTCA (μg/g)
|
TDCA (μg/g)
|
TTCA (μg/g)
|
---|
M. edulis
|
with periostracum
|
0.04
|
0.15
|
n.d.
|
n.d.
|
without periostracum
|
< 0.01
|
0.05
|
n.d.
|
n.d.
|
N. pompilius
|
0.01
|
0.03
|
n.d.
|
n.d.
|
C. nemoralis
|
0.02
|
0.07
|
0.94
|
0.33
|
C. pharaonius
|
0.11
|
0.02
|
n.d.
|
n.d.
|
S. adriatica
|
0.50
|
0.06
|
n.d.
|
n.d.
|
- Values are not corrected for recovery. Recoveries following solid-phase extraction for PDCA, PTCA, TDCA and TTCA were 82, 76, 95 and 67%, respectively [44]. Values for N. pompilius and S. adriatica were determined following storage of sample extracts (32 weeks, − 20 °C). HPLC–MS data obtained prior to and following sample storage indicated that in the S. adriatica sample originally PTCA was the predominant marker, suggesting degradation of PTCA to PDCA. n.d., not detected