GB 28342-2012The food additive. 3-(methylthio) propionate (English PDF)

1 Scope

This standard applies to the methyl acrylate as raw material for the preparation of food additives methyl 3 - methylthiopropionate.

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 Place the sample in a colorimetric tube with visual inspection Observation of law Aroma onion - like aroma 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 Methyl 3-methylthiopropionate content, w /% >= 97.0 Appendix A Acid value (in KOH)/(mg/g) <= 1.0 GB/T 14455.5 Refractive index (20 ° C) 1.462 ~ 1.468 GB/T 14454.4 Relative density (25 °C/25 °C) 1.069 ~ 1.078 GB/T 11540 Appendix A Determination of methyl methoxymethyl propionate 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 3-Methylthiopropionate Typical Gas Chromatography (Area Normalization) See Appendix B.

Appendix B

Food Additives 3 - Methylthiopropanoic Acid Methyl Esters Typical Gas Chromatography (Area normalization method) B.1 Food additive 3 Methylthiopropanoic acid methyl ester Typical gas chromatogram Food additives 3 Methylthiopropionate Typical gas chromatograms are shown in Figure B.1.

Figure B.1 Food additive 3-methylthiopropanoic acid methyl ester Typical gas chromatogram

B.2 Operating conditions B.2.1 Column. capillary column, length 50m, 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. 120 °C constant temperature 10min, and then linear temperature from 120 °C ~.200 °C, the rate of 10 °C/min.

B.2.5 Inlet temperature. 240 ° C.

B.2.6 Detector temperature. 240 ° 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. 0.2 µL.

B.2.11 Split ratio. 1/100.