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Determination of chlorogenic acids and caffeine in homemade brewed coffee prepared under various conditions.
Jeon JS, Kim HT, Jeong IH, Hong SR, Oh MS, Park KH, Shim JH, Abd El-Aty AM. Jeon JS, et al. J Chromatogr B Analyt Technol Biomed Life Sci. 2017 Oct 1;1064:115-123. doi: 10.1016/j.jchromb.2017.08.041. Epub 2017 Aug 31. J Chromatogr B Analyt Technol Biomed Life Sci. 2017. PMID: 28918319
Therefore, the present study was designated to investigate the chromatographic problems in the determination of CGAs (seven isomers) and caffeine using HPLC-DAD. The values of determination coefficient (R(2)) calculated from external-standard calibration curves were >0. …
Therefore, the present study was designated to investigate the chromatographic problems in the determination of CGAs (seven isomers) and caf …
Simultaneous determination of arbutin and its decomposed product hydroquinone in whitening creams using high-performance liquid chromatography with photodiode array detection: Effect of temperature and pH on decomposition.
Jeon JS, Kim BH, Lee SH, Kwon HJ, Bae HJ, Kim SK, Park JA, Shim JH, Abd El-Aty AM, Shin HC. Jeon JS, et al. Int J Cosmet Sci. 2015 Dec;37(6):567-73. doi: 10.1111/ics.12228. Epub 2015 May 7. Int J Cosmet Sci. 2015. PMID: 25857400
Thermal decomposition of arbutin was evaluated at temperatures ranging from 60 to 120C for 1-36 h. RESULTS: The method showed good linearity (R(2) 0.9997), precision (relative standard deviation, RSD < 5%) and acceptable extraction recovery (90-102.6%). ...
Thermal decomposition of arbutin was evaluated at temperatures ranging from 60 to 120C for 1-36 h. RESULTS: The method showed good linearity …
Simultaneous determination of water-soluble whitening ingredients and adenosine in different cosmetic formulations by high-performance liquid chromatography coupled with photodiode array detection.
Jeon JS, Kim HT, Kim MG, Oh MS, Hong SR, Yoon MH, Cho SM, Shin HC, Shim JH, Ramadan A, Abd El-Aty AM. Jeon JS, et al. Int J Cosmet Sci. 2016 Jun;38(3):286-93. doi: 10.1111/ics.12292. Epub 2015 Dec 23. Int J Cosmet Sci. 2016. PMID: 26564311
The wavelengths for the detection of arbutin, hydroquinone, niacinamide, adenosine, ascorbyl glucoside and ethyl ascorbyl ether were 283, 289, 261, 257, 238 and 245 nm, respectively. RESULTS: This method exhibited good linearity (R(2) 0.999), precision (expressed as relati …
The wavelengths for the detection of arbutin, hydroquinone, niacinamide, adenosine, ascorbyl glucoside and ethyl ascorbyl ether were 283, 28 …