GB 1886.50-2015National Food Safety Standard -- Food Additives -- Methyl-3-mercapto-furan (English PDF)

2.1 Chemical Name

Methyl-3-mercapto-2-methyl-furan or furan thiol Formula 2.2 C5H6OS

2.3 Formula

2.4 Relative molecular mass

114.16 (according to 2007 international relative atomic mass)

3.1 Sensory requirements

Sensory requirements shall comply with the requirements of Table 1.

Table 1 Sensory requirements

Project requires test methods Pale pink to pale orange color Liquid state the sample was placed in a cuvette, were visually observed Aroma of barbecue aroma GB/T 14454.2

3.2 Physical and Chemical Indicators

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

Table 2. Physical and chemical indicators

Item Index Test Method 3-mercapto-2-methyl-furan content, w /% >= 97.0 Appendix A Refractive index (20 °C) 1.5090 ~ 1.5300 GB/T 14454.4 the relative density (25 °C/25 °C) 1.100 ~ 1.150 GB/T 11540 Appendix A Determination of 3-mercapto-2-methyl-furan Content A.1 instruments and equipment A.1.1 chromatograph. According to GB/T 11538-2006 provisions in Chapter 5.

A.1.2 Column. capillary column.

A.1.3 Detector. Hydrogen flame ionization detector.

A.2 Determination

Area normalization method. According to GB/T 11538-2006 10.4 Determination.

A.3 repeatability and results are shown Performed according to GB/T 11538-2006 11.4 provisions.

Food additive methyl-3-mercapto furan gas chromatograph (area normalization method) See Appendix B.

Appendix B

Food additive methyl-3-mercapto-furyl gas chromatogram (Area normalization method) Food additives B.1 3-mercapto-2-methyl-furan-gas chromatogram Food additive methyl-3-mercapto-furan-by gas chromatography is shown in Figure B.1.

Explanation.

1 --- 3-mercapto-2-methyl furan;

2 --- bis (2-methyl-3-furyl) disulfide.

Figure B.1 food additive methyl-3-mercapto-furyl gas chromatogram

B.2 operating conditions B.2.1 Column. capillary column length 30m, an inner diameter of 0.32mm.

B.2.2 stationary phase. 5% phenyl, 95% dimethylpolysiloxane.

B.2.3 film thickness. 0.50µm.

B.2.4 chromatography oven temperature. 80 °C constant temperature 2min; then linear temperature programmed from 80 °C ~ 220 °C, the rate of 20 °C/min; and finally 220 °C constant temperature 10min.

B.2.5 Inlet temperature.200 °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 carrier gas flow rate. 4mL/min.

B.2.10 Injection volume. about 0.2µL.

B.2.11 Split ratio. 100.1.

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