GB 29961-2013Food additive -- 4, 5-dihydro-3 (2H) thiophenone (tetrahydro-thiophene-3-one) (English PDF)

2.1 Chemical Name

4,5-dihydro -3 (2H) thiophenone Formula 2.2 C4H6OS

2.3 Formula

2.4 Relative molecular mass

102.15 (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 Colorless to yellow color than the sample is placed inside the color tube, were visually observed Liquid state Fragrant aroma of garlic, meat, vegetables and green incense, butter 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 4,5-dihydro -3 (2H) -one thiophene content, w /% >= 97.0 Appendix A Refractive index (20 °C) 1.527 ~ 1.531 GB/T 14454.4 the relative density (20 °C/20 °C) 1.194 ~ 1.204 GB/T 11540 Appendix A 4,5-dihydro -3 (2H) -one thiophene Determination 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 4,5-dihydro -3 (2H) thiophene-one gas chromatograph (area normalization method) See Appendix B.

Appendix B

Food Additives 4,5-dihydro -3 (2H) -one gas chromatogram thiophen (Area normalization method) Food additives B.1 4,5-dihydro -3 (2H) -one gas chromatogram thiophen

Figure B.1.

Figure B.1 food additive 4,5-dihydro -3 (2H) -one gas chromatogram thiophen

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

B.2.2 stationary phase. polyethylene glycol.

B.2.3 film thickness. 0.25 µm.

B.2.4 chromatography oven temperature. 130 °C constant temperature 10 min; then linear temperature program from 130 °C ~ 200 °C, the rate of 10 °C/min; most After 200 °C heated 20 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. 60 kPa.

B.2.10 Injection volume. about 0.2 µL.

B.2.11 split ratio. 100︰1.