GB 28351-2012Food additive -- 5-ethyl furfural (English PDF)

1 Scope

This standard applies to 2-methyl furan as raw material prepared by the food additives 5 - methyl furfural.

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 pale yellow to brown State liquid Place the sample in a colorimetric tube with a visual method Observed Aroma spicy - sweet, warm and fragrant, slightly with caramel 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 5-methyl furfural content, w /% >= 97.0 Appendix A Acid value (in KOH)/(mg/g) <= 5.0 GB/T 14455.5 Refractive index (20 ° C) 1.525 ~ 1.535 GB/T 14454.4 Relative density (25 °C/25 °C) 1.098 ~ 1.110 GB/T 11540 Appendix A Determination of 5 - methyl furfural 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 Additive 5-Methylfurfural Typical Gas Chromatography (Area Normalization) See Appendix B.

Appendix B

Food Additive 5 - Methylfurfural Typical Gas Chromatography (Area normalization method) B.1 Food Additive 5-Methylfurfural Typical Gas Chromatography Food additives 5-methyl furfural Typical gas chromatograms are shown in Figure B.1.

Figure B.1 Food additive 5-methyl furfural Typical gas chromatogram

B.2 Operating conditions B.2.1 Column. capillary column, length 30m, 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. 140 °C constant temperature 10min, and then linear temperature from 140 °C ~.200 °C, the rate of 10 °C/min.

B.2.5 Inlet temperature. 240 ° 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. 70 kPa.

B.2.10 Injection volume. 0.2 µL.

B.2.11 Split ratio. 1/100.