GB 28341-2012The food additives. 3-methylthiopropanal (English PDF)

1 Scope

This standard applies to acrolein as raw materials prepared by the food additive 3 - methylthiopropanal.

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 Strong and easy to spread onions and meaty aroma;

After the release, the onion-like aroma is reduced, with fresh broth Beauty fragrance 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 3-methylthiopropanal content (monomer, trimer sum), w /% >= 98.0 Appendix A Acid value (in KOH)/(mg/g) <= 10.0 GB/T 14455.5 Refractive index (20 ° C) 1.479 to 1.493 GB/T 14454.4 Relative density a (25 °C/25 °C) 1.037 ~ 1.052 GB/T 11540 a If the trimer is contained, no determination is made.

Appendix A

Determination of 3 - methylthiopropanal 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-Methylthiopropanal Typical Gas Chromatography (Area Normalization) See Appendix B.

Appendix B

Food additive 3 - Methylthiopropanal Typical gas chromatogram (Area normalization method) B.1 Food Additive 3-Methylthiopropanal Typical Gas Chromatography Food additives 3-Methylthiopropanal Typical gas chromatograms are shown in Figure B.1.

Description.

1 --- 3-methylthiopropanal (monomer);

2 --- 3-methylthiopropanal (trimer).

Figure B.1 Food additive 3-Methylthiopropanal Typical gas chromatogram

B.2 Operating conditions B.2.1 Column. capillary column, length 30m, diameter 0.53mm.

B.2.2 Stationary phase. (5% phenyl) methylpolysiloxane.

B.2.3 Film thickness. 1.2 µm.

B.2.4 Chromatographic furnace temperature. 80 °C constant temperature 2.5min, and then linear temperature from 80 °C ~ 240 °C, the rate of 10 °C/min.

B.2.5 Inlet temperature. 250 ° C.

B.2.6 Detector temperature. 250 ° C.

B.2.7 Detector. Hydrogen flame ionization detector.

B.2.8 Carrier gas. nitrogen.

B.2.9 Pre-column pressure. 20 kPa.

B.2.10 Injection volume. 0.2 µL.

B.2.11 Split ratio. 1/100.