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21
RaspberryFlavor
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Alpha-ionone fromraspberriesoccurs
as an enantiopure (R)(+)-enantiomer,
illustrated on an Rt-
β
DEXsa column
in
Figure24A
.ChromatogramB rep-
resents a “naturally flavored” rasp-
berry iced tea. A racemic mixture of
α
-iononewaspresent, indicating that
it is not a completely natural rasp-
berry flavor. Thus,
α
-iononeservesas
a good marker compound for deter-
mining raspberry authenticity.
Figure 24
The Rt-
β
DEXsa column resolves isomers of
α
-ionone to
determine raspberry authenticity.
α
-ionone
20
min. 10
30
β
-ionone
δ
-decalactone
R
R
S
S
40
20
min. 10
30
40
30m, 0.32mm ID, 0.25µmRt-
β
DEXsa (cat.# 13108);
Oven temp.:
60°C (hold 2min.) to 200°C@ 3°C/min.;
Carrier gas:
helium; 60cm/sec. set @ 60°C;
Detector:
MSD set @ 220°C.
α
-ionone
A: Raspberry Extract
B: Raspberry Flavor
Alpha-ionone serves as a
goodmarker compound
for determining
raspberry authenticity.
30m, 0.32mm ID, 0.25µmRt-
β
DEXsa (cat.# 13108);
Oven temp.:
60°C (hold 2min.) to 200°C@ 3°C/min.;
Carrier gas:
helium; 60cm/sec. set @ 60°C;
Detector:
MSD set @ 220°C.
