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International Foaming Technology Exhibition on December 7-9, 2021...
Time of Update: 2021-09-26
Exhibition foam technology ( Foam Expo China ) " will be held in Shanghai New International Expo Center
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Oil prices are lowered for the first time this year, and a full box will cost 9 yuan less
Time of Update: 2021-09-25
The reporter learned from the National Development and Reform Commission that the specific conditions of this oil price adjustment are as follows: gasoline is reduced by 225 yuan per ton, and diesel is reduced by 220 yuan per ton.
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Kronos' average price of titanium dioxide fell by 13% in the second quarter of this year
Time of Update: 2021-09-23
The company's factory operating rate in the first half of this year was 97% .
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Determination of linear range and lower limit of 9 glucocorticoid residues in puffer fish, eel and grilled eel
Time of Update: 2021-09-20
>betamethasone , and dexamethasone are prepared with methanol at 0. 05μg/mL, times Clomethasone and fludrocortisone acetate
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Determination of 9 kinds of macrolide and lincosamide drug residues in livestock and poultry meat-linear range and lower limit of determination
Time of Update: 2021-09-20
Table 6-11 Linear equations and correlation coefficients of 9 antibioticsUnder the operating conditions of this method, when 9 antibiotics were added at a level of 1.
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Determination of 9 Penicillin Residues in Livestock and Poultry Meat-Selection of Analysis Conditions (1)
Time of Update: 2021-09-20
9. 5 Sodium dihydrogen phosphate buffer solution, complete the recovery rate experiment of amoxicillin and ampicillin, the results are shown in Table 5-8 .
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Determination of 9 penicillin residues in milk and milk powder——liquid chromatography-tandem mass spectrometry
Time of Update: 2021-09-20
2. 2 Principle of the methodAmoxicillin, ampicillin, piperacillin, penicillin G, penicillin V, oxacillin, cloxacillin, nafcillin and dicloxacillin residues in milk and milk powder are extracted with acetonitrile-water solution and purified by solid phase extraction column.
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Determination of 9 penicillin residues in puffer fish and eels. Application scope and method
Time of Update: 2021-09-20
of 9 penicillin standard mixed working solutions, add them to 5. 0g samples, follow the above steps to prepare nafcillin, penicillin G, piperacillin, penicillin V, and oxacillin at 1. 0 ug/kg, 2. 0 μg/kg, 4. 0 μg/kg, 10
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Determination of 9 penicillin residues in puffer fish and eels-linear range and lower limit of determination
Time of Update: 2021-09-20
Table 5-23 Linear equations and correction factors of 9 penicillinsUnder the operating conditions of this method, when the added level of 9 penicillins is 1.
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Determination of 9 Penicillin Residues in Livestock and Poultry Meat——Applicable Scope and Method Principle
Time of Update: 2021-09-20
5) buffer solution, centrifuged, the supernatant was purified with a solid phase extraction column, determined by liquid chromatography-tandem mass spectrometry, external standard Method quantitative .
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Determination of 9 Penicillin Residues in Livestock and Poultry Meat-Selection of Analysis Conditions (2)
Time of Update: 2021-09-20
Source, using positive ion detection method to perform primary mass spectrometry analysis (Q1 scan) of 9 penicillins, and the protonated molecular ion peaks are 366, 350, 518, 335, 351, 402, 436, 415, and 470, respectively.
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Determination of 9 Penicillin Residues in Livestock and Poultry Meat——Linear Range and Lower Limit of Determination
Time of Update: 2021-09-20
Table 5-10 Linear equations and correction factors of 9 penicillinsUnder the operating conditions of this method, when the added level of 9 penicillins was in the range of 0.
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Determination of 9 glucocorticoid residues in puffer fish, eels and grilled eels by liquid chromatography-tandem mass spectrometry
Time of Update: 2021-09-20
10. 2. 1. 1 Scope of application>Suitable for 9 glucocorticoids in puffer fish, eels and grilled eels (
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Determination of 9 kinds of penicillin residues in puffer fish and eels-selection of analytical conditions
Time of Update: 2021-09-20
The experiment found that when two samples were extracted with acetonitrile, the recovery rates of amoxicillin and ampicillin ranged from 10.
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Determination of 9 glucocorticoid residues in puffer fish, eel and grilled eel
Time of Update: 2021-09-20
Table 10-3 Mobile phase, flow rate and gradient elution conditions (2) Mass spectrometry conditionsIon source: Electrospray ion source (ESI); Scan mode: Negative ion scan; Detection mode: Multi-reaction monitoring; Curtain gas pressure: 0.
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Determination of 9 kinds of penicillin residues in milk and milk powder-linear range and lower limit of determination
Time of Update: 2021-09-20
>penicillin drug, a series of standard working solutions are prepared with water, and a series of matrix standard working solutions are prepared with the blank solutions of milk and milk powder samples
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Determination of 9 kinds of macrolides and lincosamide drug residues in livestock and poultry meat-applicability of the method
Time of Update: 2021-09-20
The blank sample experiment also showed that the applicability of this method is very good for samples such as lamb, chicken, beef, and pork.
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Determination of 9 kinds of macrolides and lincosamide drug residues in livestock and poultry meat
Time of Update: 2021-09-20
(1) Liquid chromatography conditions>Column: IntersilC 18 , 3μm, 150mm×2. 1mm or equivalent
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Determination of 9 kinds of macrolides and lincosamide drug residues in livestock and poultry meat-selection of analytical conditions
Time of Update: 2021-09-20
were tested . The comparison results are shown in Table 6-7 . From the data in Table 6-7, it can be seen that when using 0. 1mol/L phosphate buffer solution
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Determination of 9 Penicillin Residues in Milk and Milk Powder-Selection of Analysis Conditions
Time of Update: 2021-09-20
Experiments have found that when the sodium dihydrogen phosphate buffer is used as the extraction solution, the protein cannot be precipitated, and it is more difficult to pass the solid phase extraction column .
