3.3. Chromatogram of soy sauce extraction
The chromatogram of soy sauce extraction is shown in Fig. 3. As
shown in Fig. 3, separation of all the components was achieved in
less than 8.1 min. The retention times of BA, SA and CA were 3.654,
4.497 and 8.007 min, respectively.
3.4. Precision and recovery studies
The repeatability of the method was judged by triplicate HPLC
analysis with the same soy sauce under the same sample preparation
procedure. The reproducibility over different days was tested
for the determination of the same standard mixtures, which were
stored in a refrigerator and covered by aluminum foil (to keep