GB 1886.28-2016Food additive -- Sodium D-isoascorbate (English PDF)

2.1 Chemical Name

Methyl-5-thiazole ethanol Formula 2.2 C6H9NOS

2.3 Formula

2.4 Relative molecular mass

143.21 (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 Color status Colorless to pale yellow, turn brown when aging Viscous oily liquid the sample was placed in a cuvette, were visually observed Aroma beef, nut-like aroma GB/T 14454.2

3.2 Physical and Chemical Indicators

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

GB 1886.293-2016

Table 2. Physical and chemical indicators

Item Index Test Method Hydroxyethyl 4-methylthiazole-5- content, w /% >= 98.0 Appendix A Acid value (in dollars KOH)/(mg/g) <= 3.0 GB/T 14455.5 Refractive index (20 °C) 1.540 ~ 1.556 GB/T 14454.4 the relative density (25 °C/25 °C) 1.196 ~ 1.210 GB/T 11540 GB 1886.293-2016 Appendix A 5- hydroxyethyl Determination of the content of 4-methylthiazole 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 According to GB/T 11538-2006 provisions in 11.4, shall comply with the requirements.

Food Additives 5- hydroxyethyl 4-methylthiazole gas chromatograph and operating conditions, see Appendix B.

GB 1886.293-2016

Appendix B

Food additives 5- Hydroxyethyl 4-methylthiazole and operating conditions of a gas chromatograph (Area normalization method) B.1 food additives Hydroxyethyl 4-methylthiazole-5- gas chromatogram Food additives Hydroxyethyl 4-methylthiazole-5- gas chromatography is shown in Figure B.1.

Figure B.1 food additives Hydroxyethyl 4-methylthiazole-5- gas chromatogram

B.2 operating conditions B.2.1 Column. capillary column length 30m, an inner diameter of 0.50mm.

B.2.2 stationary phase. (5% phenyl) -95% dimethylpolysiloxane.

B.2.3 film thickness. 0.50µm.

B.2.4 chromatography oven temperature. 170 °C constant temperature 10min, then a linear temperature program from 170 °C to 200 °C, the rate of 10 °C/min, and finally 200 °C constant temperature 15min.

B.2.5 Inlet temperature. 250 °C.

B.2.6 detector temperature. 260 °C.

B.2.7 Detector. Hydrogen flame ionization detector.

B.2.8 carrier gas. nitrogen.

B.2.9 carrier gas flow rate. pre-column pressure 50kPa.

B.2.10 Injection volume. 0.2µL.

B.2.11 split ratio. 30.1.