Method for detecting methoxypyrazine compounds in grape wine
A methoxypyrazine and detection method technology, which is applied in the field of wine analysis and detection, can solve problems such as large errors, cumbersome operations, and difficult quantitative analysis, and achieve the effects of high accuracy, high efficiency separation ability, and improved sensitivity
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Embodiment 1
[0047] A method for detecting methoxypyrazine compounds in wine, the specific steps are as follows:
[0048] (1) Dilution: dilute the wine sample with deionized water to an ethanol concentration of 10%;
[0049] (2) Extraction: After adding 1.0 g of sodium chloride solid to 5 ml of wine samples with an ethanol concentration of 10%, carry out headspace-solid phase microextraction, extract at 60°C for 90 minutes at a rotational speed of 600°C, and obtain the extracted sample;
[0050] (3) Sampling: Immediately inject the extracted sample into gas chromatography for 15 minutes, the carrier gas of the sample injection is high-purity helium (99.999%), and the flow rate is 1ml min -1 , the splitless mode is adopted, and the splitless time is 2 minutes.
[0051] (4) Heating program: after sample injection, keep the extracted sample at 40°C for 5min, then heat up at 3°C·min -1 The heating rate is increased to 130°C, kept for 2min, and then at 25°C·min -1 The heating rate was incre...
Embodiment 2
[0055] A method for detecting methoxypyrazine compounds in wine, the specific steps are as follows:
[0056] (1) Dilution: dilute the wine sample with deionized water to an ethanol concentration of 8%;
[0057] (2) Extraction: After adding 1.0 g of sodium chloride solid to 5 ml of wine samples with an ethanol concentration of 8%, perform headspace-solid-phase microextraction, extract at a rotation speed of 625 rpm, and extract at 57.5 ° C for 93 min to obtain the extracted sample;
[0058] (3) Sampling: Immediately inject the extracted sample into gas chromatography for 15 minutes, the carrier gas of the sample injection is high-purity helium (99.999%), and the flow rate is 1ml min -1 , the splitless mode is adopted, and the splitless time is 2 minutes.
[0059] (4) Heating program: after sample injection, keep the extracted sample at 40°C for 5min, then heat up at 3°C·min -1 The heating rate increased to 125°C, kept for 2min, and then increased to 25°C·min -1 The heating ...
Embodiment 3
[0063] A method for detecting methoxypyrazine compounds in wine, the specific steps are as follows:
[0064] (1) Dilution: dilute the wine sample with deionized water to an ethanol concentration of 13%;
[0065] (2) Extraction: After adding 1.0 g of sodium chloride solid to 5 ml of wine samples with an ethanol concentration of 13%, perform headspace-solid-phase microextraction, extract at a rotation speed of 550 rpm, and extract at 55°C for 95 minutes to obtain the extracted sample;
[0066] (3) Sampling: Immediately inject the extracted sample into gas chromatography for 15 minutes, the carrier gas of the sample injection is high-purity helium (99.999%), and the flow rate is 1ml min -1 , the splitless mode is adopted, and the splitless time is 2 minutes.
[0067] (4) Heating program: after sample injection, keep the extracted sample at 40°C for 5min, then heat up at 3°C·min -1 The heating rate increased to 135°C, kept for 2min, and then increased to 25°C·min -1 The heatin...
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