Calculation of the molar absorptivity of polyphenols by using liquid chromatography with diode array detection: the case of carnosic acid

Pelillo, Marco; Cuvelier, Marie-Elisabeth; Biguzzi, Barbara; Toschi, Tullia Gallina; Berset, Claudette; Lercker, Giovanni

doi:10.1016/s0021-9673(03)01206-8

Cited by 57 publications

(40 citation statements)

References 16 publications

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“…This can be observed by the molar absorptivity, as shown by the Lambert-Beer Law, which relates the absorbance and molar concentration of the analyte. 17 A high absorptivity demonstrates the capacity of the chromophore to absorb light in certain conditions, and the higher this value, the more precise will be the determination of absorbance. 13 With more hydroxyl groups linked to the aromatic ring, pyrogallol has similar reaction kinetics to CE, and is therefore considered the best standard for the determination of TP for this herbal drug.…”

Section: Resultsmentioning

confidence: 99%

Development of a UV/Vis spectrophotometric method for analysis of total polyphenols from Caesalpinia peltophoroides Benth

Bueno¹,

Machareth²,

Panizzon³

et al. 2012

Quím. Nova

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Recebido em 23/8/11; aceito em 3/11/11; publicado na web em 4/1/12Caesalpinia peltophoroides is a domesticated tree found in Brazil. It was necessary to develop an analytical method to determine the content of total polyphenols (TP) in this herbal drug. The pre-analytical method was standardized for analysis time, wavelength, and the best standard to use. The optimum conditions were: pyrogallol, 760 nm, and 30 min respectively. Under these conditions, validation by UV/Vis spectrophotometry proved to be reliable for TP of the crude extract and semipurified fractions from C. peltophoroides. Standardization is required for every herbal drug, and this method proved to be linear, precise, accurate, reproducible, robust, and easy to perform.

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Section: Resultsmentioning

confidence: 99%

Development of a UV/Vis spectrophotometric method for analysis of total polyphenols from Caesalpinia peltophoroides Benth

Bueno¹,

Machareth²,

Panizzon³

et al. 2012

Quím. Nova

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“…The corresponding rates of hydrolysis [27] were estimated by HPLC (at k = 254 nm). Aliquots from aqueous solutions of the N-mustards (50 lL of a 2 mM DMSO N-mustard solution was added to a 950 lL mixture of acetone:water, 1:1) at 60°C were analyzed to determine the percentage of unreacted material every Fig.…”

Section: Relative Reactivity Of the N-mustards 10a And 10bmentioning

confidence: 99%

“…The K alk (in this case K alk = K 0 disregarding K hyd and K dec ) values were calculated [27] using:…”

Section: Relative Reactivity Of the N-mustards 10a And 10bmentioning

confidence: 99%

Synthesis and in vitro anticancer evaluation of 1,8-naphthalimide N(4) and S(4)-derivatives combining DNA intercalation and alkylation capabilities

et al. 2015

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Research on DNA binding antitumor agents has been classically steered by either non-covalent (DNA intercalation) or covalent (DNA alkylation) interactions. In this context bi-functional anticancer molecules are particularly attractive since they are capable of sequential DNA intercalation followed by DNA alkylation. Here we describe the synthesis and in vitro anticancer activity of bi-functional 1,8-naphthalimide N(4) and S(4)-derivatives. Cell viability assays indicate that our amonafide-N-mustard chimeras are selective, effective only on certain tumor cell lines, and less toxic toward nonmalignant cells than the drug amonafide. The biological activities of the bi-functional derivatives presented here are encouraging and the compounds are suitable for further optimization and in vivo studies. Graphical Abstract Here we describe the synthesis and in vitro anticancer activity of three bi-functional 1,8-naphthalimide N(4) and S(4)-derivatives presenting both DNA intercalation and alkylation capabilities. Cell viability assays indicate that these amonafide-N-mustard chimeras are effective only on certain tumor cell lines and are less toxic towards non-malignant cells than their parent drug: amonafide.Electronic supplementary material The online version of this article (

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“…It is interesting to highlight that the arbitrary choice of Dt (the elution time range of the peak or the complete chromatographic run time) has no influence on the final result. This parameter is comprised on both the average absorbance and the averaged concentration and can be simplified as demonstrated by other authors [14]. Torsi et al [15] published a theoretical study, which led to the derivation of the Lambert-Beer's law applicable to HPLC spectrophotometric detectors.…”

Section: Calculation Of the Molar Absorptivity (E) By Hplc With Uv Dementioning

confidence: 99%

“…The coefficient 10 3 is measured in (mL L -1 ) and is necessary to hold the dimensional coherence, since e is the molar absorptivity. As proposed by Pelillo et al [14], the equation should be expressed in terms of e as a function of the other experimental parameters, taking in count the effective units adopted by the experimental apparatus employed. The equation results as the following:…”

Section: Calculation Of the Molar Absorptivity (E) By Hplc With Uv Dementioning

confidence: 99%

Use of HPLC in the Determination of the Molar Absorptivity of 4′-Geranyloxyferulic Acid and Boropinic Acid

et al. 2011

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Natural prenyloxycinnamic acids were shown to exert in vitro and in vivo remarkable and valuable anti-cancer and anti-inflammatory effects. Among these, 4 0 -geranyloxyferulic acid [3-(4 0 -geranyloxy-3 0 -methoxyphenyl)-2-trans-propenoic acid] was discovered as an efficient orally active chemopreventive agent of several types of cancer, and its structural analogue boropinic acid was shown to exert a valuable inhibitory effect both in vitro and in vivo against the growth of Helicobacter pylori. As a continuation of our chemical, chemico-physical, and pharmacological studies on these secondary metabolites, we report herein the comparison between traditional UV/Vis assays and HPLC-DAD methods for the determination of the molar absorptivity coefficient of 4 0 -geranyloxyferulic acid (e 310 = 12,950 and e 288 = 11,910 L mol -1 cm -1 ) and boropinic acid (e 310 = 13,510 and e 288 = 12,350 L mol -1 cm -1

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Calculation of the molar absorptivity of polyphenols by using liquid chromatography with diode array detection: the case of carnosic acid

Cited by 57 publications

References 16 publications

Development of a UV/Vis spectrophotometric method for analysis of total polyphenols from Caesalpinia peltophoroides Benth

Development of a UV/Vis spectrophotometric method for analysis of total polyphenols from Caesalpinia peltophoroides Benth

Synthesis and in vitro anticancer evaluation of 1,8-naphthalimide N(4) and S(4)-derivatives combining DNA intercalation and alkylation capabilities

Use of HPLC in the Determination of the Molar Absorptivity of 4′-Geranyloxyferulic Acid and Boropinic Acid

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