Discrimination and classification of tobacco wastes by identification and quantification of polyphenols with LC-MS/MS

Wang, Jun; Lu, Dan; Zhao, Hui; Ben, Jiang; Wang, Jiali; Ling, Xiuquan; Chai, Hong; Ouyang, Pingkai

doi:10.2298/jsc091109055w

Cited by 29 publications

(33 citation statements)

References 31 publications

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“…At approximately this wavelength, 5-CQA was proved to present maximum absorbance [6,7,9,11,21,26,29]. Available HPLC analyses of 5-CQA submitted to conditions of oxidation almost identical to those adopted in the current investigation [7] support the reliability of the current kinetic results based on absorbance measurements.…”

Section: Methodssupporting

confidence: 75%

A shrinking core model for slow combustion of solid 5-O-caffeoylquinic acid

Zanoelo

Benincá

2011

Reac Kinet Mech Cat

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The oxidation of 5-O-caffeoylquinic acid (5-CQA) was investigated in the temperature range from 161 to 188°C. The kinetic experiments were carried out in small batch reactors made of glass, where a very thin (1.1 lm) fixed bed of powder 5-CQA was in contact with air at approximately 91.4 kPa. Aqueous 5-CQA solutions were prepared with the solid found in the reactors at different reaction times and used to measure the decrease of 5-CQA concentrations with a spectrophotometer operated at 323 nm. A shrinking core model was applied to describe the non-catalytic heterogeneous reaction between 5-CQA and oxygen. It basically assumes mass transfer of O 2 from bulk air to the outer surface of nonporous particles of solid 5-CQA, where an irreversible reaction with no formation of solid products takes place. The proposed model correctly reproduced the obtained kinetic results in all the investigated operating conditions when an exponential reduction of external area of solid with reaction time was taken into account. Arrhenius-type expressions successfully described the dependence of the calculated global reaction and shrinking rate constants on temperature. An activation energy close to 77046 J mol -1 was found for the slow combustion reaction of 5-CQA.Keywords 5-CQA Á CGA Á Chlorogenic acids Á Shrinking core model Á Slow combustion Abbreviations aExternal surface area of solid per initial volume of bed (m 2 m -3 ) a i Initial external surface area of solid per initial volume of bed (m 2 m -3 ) AAbsorbance of aqueous solution of 5-CQA (mAu) k c External coefficient of mass transfer (m s -1 )

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Section: Methodssupporting

confidence: 75%

A shrinking core model for slow combustion of solid 5-O-caffeoylquinic acid

Zanoelo

Benincá

2011

Reac Kinet Mech Cat

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“…Chlorogonic acid has been reported to have a number of biological properties, such as antibacterial, antioxidant, hepatocyte protective and antimutagenic activity [51]. Artichoke capitula was characterized by significant amounts of chlorogenic acid and various dicaffeoylquinic esters, especially 1,3-dicaffeoylquinic acid, known as cynarin [7].…”

Section: Discussionmentioning

confidence: 99%

Diversity of active constituents inCichorium endiviaandCynara cornigeraextracts

Hegazy¹,

Ezzat²,

Qasem³

et al. 2015

Acta Biologica Hungarica

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The present study attempts to explore the phytochemical constituents of different extracts from Cynara cornigera and Cichorium endivia plant materials. The two species studied are native in Egypt. Five different solvents, viz., aqueous, methylene chloride, petroleum ether, ethyl acetate, and n-butanol were used. Phytochemical analysis revealed the presence of phenols, flavonoids, sterols (stigmasterol and betasitosterol), terpenes (α-amyrin, ursolic and oleanolic acid), and hydrocarbons (n-alkane), the latter found in low amount. The ethyl acetate and water extracts of C. cornigera root showed lower mass fractions of phenolic compounds ranged from 20 to 81 g/100 g, and higher amounts in ethyl acetate extract of the inflorescences and butanol extract of the root where values ranged from 195 to 399 g/100 g. The β-sitosterol and stigmasterol were present in all plant extracts. Oleanolic and ursolic acids were detected in roots, leaves and inflorescences of C. cornigera and in C. endivia shoot. The ethyl acetate extracts from C. cornigera leaf and inflorescence attained higher chemical diversity than the other extracts. Alternatively, sterols and triterpenes were the major constituents. The high chemical diversity of active constituents justifies the future potential use of the two species at commercial level.

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“…그 이유는 천연에서의 IQ의 존재량이 매우 적을 뿐만 아 니라 다양한 불순물의 존재 때문에 추출하는 것이 매우 어렵기 때문 이다 [11]. 반면에 QU의 2배당체인 rutin (RU)은 다양한 식물군에 널리 분포하고 있고 [12], 예를 들면 Alabastrasophorae japonicae에는 10-28% 정도 포함되어 있으므로 [13] …”

Section: )unclassified

Study on the Synthesis of Isoquercitrin by Enzymatic Partial Hydrolysis

Lee¹,

Chung

2014

Applied Chemistry for Engineering

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Isoquercitrin (IQ), quercetin monoglycoside, is classified as a polyphenol, and a minute quantity of IQ is known to be present in several plants. Recently, it was reported that IQ can be prepared by the partial enzymatic hydrolysis of quercetin diglycoside (rutin, RU). In this paper, the effects of enzyme types, enzyme amounts, and substrate concentrations on the reactivity were investigated using a series of Pecinex TM multi-enzymes. The reaction, when a 8 ml of Ultra Clear to 1 g of RU was applied with the substrate concentration of 1% at 50 ℃, was found to be optimum, based on the reaction rate and the selectivity to IQ. Keywords

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Discrimination and classification of tobacco wastes by identification and quantification of polyphenols with LC-MS/MS

Cited by 29 publications

References 31 publications

A shrinking core model for slow combustion of solid 5-O-caffeoylquinic acid

A shrinking core model for slow combustion of solid 5-O-caffeoylquinic acid

Diversity of active constituents inCichorium endiviaandCynara cornigeraextracts

Study on the Synthesis of Isoquercitrin by Enzymatic Partial Hydrolysis

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