TA Instruments TGA 2950 - Monosodium Glutamate

Appendix B
B–68 TA I NSTRUMENTS TGA 2950
Monosodium Glutamate
In Figure B.18 we analyzed Accent
®
brand
monosodium glutamate (MSG), a common salt
used for seasoning foods, which has three well
resolved transitions below 500
°
C. Curves a and
c show the result of conventional constant
heating rate scans of MSG at 1 and 20
°
C/minute.
Curve b shows the result of a dynamic rate Hi-
Res
TM
scan at resolution setting 4.0 and sensitiv-
ity setting 1.0. As can be seen by the derivative
of weight loss curves, the Hi-Res
TM
scan gives
resolution comparable to the 1
°
C/minute scan in
a fraction of the time.
Figure B.18
If you should decide to run this sample, be
aware that MSG foams significantly at these
temperatures. If a sample size greater than
(a) 1
°
C/min Normal Ramp; (b) 50
°
c/min Hi-Res
TM
Ramp, Res 4.0, Sens 1.0; (c) 20
°
C/min Normal
Ramp; (d) 1
°
C/min; (e) 50
°
C/min; (f) 20
°
C/min.