GB 28364-2012The food additive -- 2-methyl -2-pentenoic acid (strawberry acid) (English PDF)

1 Scope

This standard applies to propanal as raw materials or n-butyraldehyde and malonic acid as raw materials prepared by the food additive 2-methyl-2-pentenoic acid (strawberry acid).

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 or solid Place the sample in a colorimetric tube with a visual method Observed Fragrance 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 2-methyl-2-pentenoic acid content, w /% >= 98.0 Appendix A Refractive index (20 ° C) 1.450 ~ 1.460 GB/T 14454.4 Relative density (25 °C/25 °C) 0.976 ~ 0.982 GB/T 11540 Appendix A Determination of 2 - methyl - 2 - pentenoic acid 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 2-methyl-2-pentenoic acid Typical gas chromatogram (area normalization) See Appendix B.

Appendix B

Food additive 2-methyl-2-pentenoic acid Typical gas chromatogram (Area normalization method) B.1 Food additive 2-methyl-2-pentenoic acid Typical gas chromatogram Food additives 2-methyl-2-pentenoic acid Typical gas chromatograms are shown in Figure B.1.

Figure B.1 Food additive 2-methyl-2-pentenoic acid Typical gas chromatogram

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

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

B.2.3 Film thickness. 0.25 µm.

B.2.4 Chromatographic furnace temperature. 180 °C constant temperature.

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 Carrier gas flow rate. about 30 mL/min.

B.2.10 Injection volume. 0.2 µL.

B.2.11 Split ratio. 1/75.