Method for detecting TBHQ by surface enhanced Raman spectroscopy
A surface-enhanced Raman and spectral detection technology, applied in the field of chemical analysis, can solve problems such as poor characteristics and detection interference, and achieve the effects of strong selectivity, stable reaction system, and high sensitivity
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Embodiment 1
[0028] Embodiment 1: the mensuration of TBHQ in the orange essence
[0029] Step S1, preparation of Cu-I / CDs: 0.1g CuCl 2 Dissolve 0.4g of 3-iodo-L-tyrosine in 40mL of purified water, mix and dissolve, add 100μL of ethylenediamine, sonicate for 10min, transfer to a polytetrafluoroethylene reactor, heat at 180°C for 8h, and cool naturally, First filter with a filter membrane with a pore size of 0.22 μm, and then dialyze with a dialysis bag with a molecular weight cut-off of 3000D for 24 hours to obtain water-soluble Cu-I / CDs.
[0030] Step S2, preparation of composite nanozyme: 2mL of 0.25g / mL polypropyleneimine, add 20mL ultrapure water, add 1% chloroauric acid 80μL under stirring, then add 200μL Cu-I / CDs, after stirring for 30min, The solution turned reddish brown, and a composite nanozyme composed of gold nanoparticles and Cu-I / CDs was obtained.
[0031] Step S3, TBHQ oxidation product SERS spectrum detection wave number determination: Add 50-100 μL of composite nanozyme a...
Embodiment 2
[0040] Embodiment 2: the mensuration of TBHQ in peppermint essence
[0041] Step S1, preparation of Cu-I / CDs: same as Example 1;
[0042] Step S2, preparation of composite nanozyme: same as Example 1;
[0043] Step S3, TBHQ oxidation product SERS spectrum detection wavenumber determination: same as Example 1;
[0044] Step S4, TBHQ working curve making: with embodiment 1;
[0045] Step S5. Determination of TBHQ in the peppermint essence sample: Same as in Example 1, the content of TBHQ in the peppermint sample is 30.21 mg / kg.
Embodiment 3
[0046] Embodiment 3: the mensuration of TBHQ in vanilla essence
[0047] Step S1, preparation of Cu-I / CDs: same as Example 1;
[0048] Step S2, preparation of composite nanozyme: same as Example 1;
[0049] Step S3, TBHQ oxidation product SERS spectrum detection wavenumber determination: same as Example 1;
[0050] Step S4, TBHQ working curve making: with embodiment 1;
[0051] Step S5. Determination of TBHQ in the vanilla essence sample: Same as in Example 1, the content of TBHQ in the vanilla essence sample is 9.36 mg / kg.
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