Determination of Maltol and Ethyl Maltol in Apple Juice by Gas-Liquid Chromatography

1968 ◽  
Vol 51 (5) ◽  
pp. 959-963
Author(s):  
S W Gunner ◽  
B Hand ◽  
M Sahasrabudhe
Keyword(s):  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
Ethyl Acetate ◽  
Apple Juice ◽  
Internal Standard ◽  
Gas Liquid Chromatography ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Trimethylsilyl Derivatives

Abstract The qualitative and quantitative analysis of maltol and ethyl maltol in apple juice is described. The compounds were extracted with ethyl acetate and, after the addition of 2,6-dimethoxyphenol as internal standard, they were analyzed by gas-liquid chromatography as such or as their trimethylsilyl derivatives. Recovery of maltol and ethyl maltol was dependent on the method of isolation and ranged from 92 to 97.5% in the method of choice

scholarly journals Determination of Flavonoids Compounds of Three Species and Different Harvesting Periods in Crataegi folium Based on LC-MS/MS

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1602
Author(s):  
Ya-Ping Guo ◽  
Hong Yang ◽  
Ya-Li Wang ◽  
Xiao-Xiang Chen ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Qualitative Analysis ◽  
Quantitative Method ◽  
Total Content ◽  
Qualitative And Quantitative Analysis ◽  
Pharmacological Activities ◽  
Time Saving ◽  
Qualitative And Quantitative ◽  
First Time

Crataegi folium have been used as medicinal and food materials worldwide due to its pharmacological activities. Although the leaves of Crataegus songorica (CS), Crataegus altaica (CA) and Crataegus kansuensis (CK) have rich resources in Xinjiang, China, they can not provide insights into edible and medicinal aspects. Few reports are available on the qualitative and quantitative analysis of flavonoids compounds of their leaves. Therefore, it is necessary to develop efficient methods to determine qualitative and quantitative flavonoids compounds in leaves of CS, CA and CK. In the study, 28 unique compounds were identified in CS versus CK by qualitative analysis. The validated quantitative method was employed to determine the content of eight flavonoids of the leaves of CS, CA and CK within 6 min. The total content of eight flavonoids was 7.8–15.1 mg/g, 0.1–9.1 mg/g and 4.8–10.7 mg/g in the leaves of CS, CA and CK respectively. Besides, the best harvesting periods of the three species were from 17th to 26th September for CS, from 30th September to 15th October for CA and CK. The validated and time-saving method was successfully implemented for the analysis of the content of eight flavonoids compounds in CS, CA and CK for the first time.

Qualitative and quantitative determination of trace aldehydes and ketones in food preservative propionic acid for quality improvement

2021 ◽  
Author(s):  
Yiwen Cao ◽  
Shenjie Zhu ◽  
Lin Zhang ◽  
Qun Cui ◽  
Haiyan Wang
Keyword(s):  
Quality Improvement ◽  
Quantitative Analysis ◽  
Quantitative Determination ◽  
Propionic Acid ◽  
Qualitative And Quantitative Analysis ◽  
Food Preservative ◽  
Qualitative And Quantitative ◽  
Aldehydes And Ketones ◽  
Aldehyde Content

Aiming at the difficulty in qualitative and quantitative analysis of trace compositions in food preservative propionic acid, the trace compositions and the key components influencing the total aldehyde content in...

Determination of m-Cresol and p-Cresol in Industrial Cresols by Raman Spectrometer

2012 ◽  
Vol 468-471 ◽  
pp. 1104-1109
Author(s):  
Hui Ying Yu ◽  
Ping Yan
Keyword(s):  
Quantitative Analysis ◽  
Cross Section ◽  
Deformation Vibration ◽  
Testing Time ◽  
Qualitative And Quantitative Analysis ◽  
Raman Spectrometer ◽  
Qualitative And Quantitative ◽  
Gc Analysis

Adopting raman spectrometer to conduct qualitative and quantitative analysis of m-cresol and p-cresol, selecting the respective character peak of bencycloquidium after deformation vibration (m-cresol at 732 cm-1 and p-cresol at 841 cm-1), via experiment and calculations, the relative raman cross section of m-cresol and p-cresol can be concluded:(∂σ/∂Ω)732cm-1/(∂σ/∂Ω)1000cm-1 is 0.74 (height-fitting of the peak), and 0.61 (area-fitting of the peak). This method samples simply and rapidly, and has a short testing time, whose quantitative analysis result of m-/p-cresol is consistent with that of GC analysis.

DETERMINATION OF PLASMA OESTRIOL IN NORMAL PREGNANCY AND LABOUR USING GAS-LIQUID CHROMATOGRAPHY

1971 ◽  
Vol 51 (3) ◽  
pp. 447-454 ◽  
Author(s):  
W. COOPER ◽  
M. G. COYLE ◽  
J. A. MILLS
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Quantitative Determination ◽  
Internal Standard ◽  
Normal Pregnancy ◽  
Gas Liquid Chromatography ◽  
Chemical Purification ◽  
Peripheral Plasma ◽  
Pregnancy And Delivery

SUMMARY A method is described for estimating oestriol in 2–10 ml samples of human pregnancy peripheral plasma. It incorporates acid hydrolysis, chemical purification, methylation, chromatography on alumina columns, formation of a derivative and quantitative determination by gas chromatography. A radioactive internal standard was added to correct for procedural losses. Plasma oestriol determinations in five normal patients throughout pregnancy and delivery are reported.

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