GB 28339-2012Food additives -- Dimethyl sulfide (English PDF)

1 Scope

This standard applies to sodium methanethiol as raw materials prepared by the food additive dimethyl sulfide.

2 Chemical name, molecular formula, structural formula and relative molecular mass

3 Technical requirements

3.1 sensory requirements. should be consistent with the provisions of Table 1.

Table 1 sensory requirements

The project requires a test method Color colorless to pale yellow State liquid the sample was placed in a colorimetric tube and visually observed Aroma of unpleasant raw radish, cabbage flavor GB/T 14454.2

3.2 Physical and chemical indicators. should be consistent with the provisions of Table 2.

Table 2 Physical and chemical indicators

Item Index Test Method Solubility (25 ° C) 1 mL The sample was dissolved in 1 mL of 95% by volume ethanol. GB/T 14455.3 Dimethyl sulfide content, w /% >= 95.0 Appendix A Refractive index (20 ° C) 1.423 ~ 1.441 GB/T 14454.4 Relative density (25 °C/25 °C) 0.840 ~ 0.850 GB/T 11540 Appendix A Determination of dimethyl sulfide content A.1 Instruments and equipment A.1.1 chromatograph. according to GB/T 11538-2006 in Chapter 5 of the provisions.

A.1.2 Column. Capillary column.

A.1.3 Detector. Hydrogen flame ionization detector.

A.2 Determination method Area normalization method. according to GB/T 11538-2006 10.4 determination of content.

A.3 repeatability and result representation According to GB/T 11538-2006 11.4 implementation of the provisions.

Food additives Dimethyl sulfide Typical gas chromatograms (area normalization) See Appendix B.

Appendix B

Food additive Dimethyl sulfide Typical gas chromatogram (Area normalization method) B.1 Food additive Dimethyl sulfide Typical gas chromatogram Food additives Dimethyl sulfide Typical gas chromatograms are shown in Figure B.1.

Figure B.1 Food additive Dimethyl sulfide Typical gas chromatogram

B.2 Operating conditions B.2.1 Column. capillary column, length 30m, inner diameter 0.25mm.

B.2.2 Stationary phase. Polyethylene glycol.

B.2.3 Film thickness. 0.25 µm.

B.2.4 chromatographic furnace temperature. 40 °C constant temperature 10min, and then linear temperature from 40 °C ~.200 °C, the rate of 10 °C/min.

B.2.5 Inlet temperature. 220 ° C.

B.2.6 Detector temperature. 220 ° C.

B.2.7 Detector. Hydrogen flame ionization detector.

B.2.8 Carrier gas. nitrogen.

B.2.9 Pre-column pressure. 70 kPa.

B.2.10 Injection volume. about 0.2 µL.

B.2.11 Split ratio. 1/100.