Untargeted and targeted methodologies in the study of tea (Camellia sinensis L.)

Daglia, Maria; Antiochia, Riccarda; Sobolev, Anatoly P.

doi:10.1016/j.foodres.2014.03.070

Cited by 48 publications

(28 citation statements)

References 81 publications

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“…Recently, gold nanoparticles (AuNPs) have been synthesized within 30 min by reducing sodium tetrachloroaurate (NaAuCl 4 ) with extracts of Darjeeling tea leaves. In that study it was demonstrated that catechins present in the extract acted as reducing agents, with epicatechins and epigallocatechins as stabilizing agents . Alternatively, AuNPs were obtained by reduction of tetrachloroauric acid (HAuCl 4 ) with gallic acid at room temperature within 30 min.…”

Section: Introductionmentioning

confidence: 81%

“…Darjeeling tea leaves.I nt hat studyi tw as demonstrated that catechins present in the extract acted as reducing agents,w ith epicatechins and epigallocatechinsa ss tabilizing agents [14].A lternatively,A uNPsw ere obtained by reduction of tetrachloroauric acid (HAuCl 4 )w ith gallic acid at room temperature within 30 min.T hese NPs were successively modified with3 -a nd 5-alkanethiol-capped 12-baseo ligonucleotides to form two different nucleic acid probes [15].T he flower extracto fRosa damascena was used to produceA uNPs and AgNPs by reducing HAuCl 4 and AgNO 3 within 5min and successively employed for electrode modification in ordert oi ncrease the electroactive surfacea rea and the electron transferr ate [16].…”

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confidence: 99%

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Green Synthesis and Characterization of Gold and Silver Nanoparticles and their Application for Development of a Third Generation Lactose Biosensor

et al. 2016

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[a] 1Introduction Nanotechnology is one of the most active areas of modernr esearch. New applications of nanoparticles (NPs) and nanomaterials are emerging rapidly.I nt he last decade metal nanoparticles (MNPs) have played an importantr ole in the development of biofuel cells,i on batteries and (bio)sensing devices [1][2][3][4] especially in the medical diagnostics field. MNPsa re commonly described as nanosized metals with dimensions within1 -100 nm with manyo pto-electronic properties such as larger surface area-volumer atio compared to their corresponding bulk material, large surface energies,p lasmonic excitation and quantum confinement [5].H istorically,g old, silver and copper MNPs were the most largely synthesized,b ecause of the particular properties of the noble metals, followed by iron oxide MNPsf or their magnetic properties [6][7][8].Thei ntegration of green chemistry principles to nanotechnology is one of the key issues of nanoscience research.G reen synthesis has become the way for asustainable and safe production of NPs and it has been proven to be an advantegeous methodd ue to its slower kinetics, easy manipulation and control over crystal growth for stabilization of NPs [9,10].Theuse of environmentally friendly materials,inparticular plant extracts,f ungi, bacteriaa nd enzymes,f or the synthesis of MNPs showed numerous benefits in pharmaceuticala nd other biomedical applications [11][12][13].G reen synthesis resulted also in being very cost effective and therefore can be used as ac heep suitable alternative for large-scale production of MNPs.Several approaches have been reported in the literature usinge xtracts from av ariety of differentp lant species in combination with av ariety of acids and metals alts.F or example aqueous extractso fFerocactuse chidne have been used to reduce silver nitrate (AgNO 3 )t of orm silver nanoparticles (AgNPs) within 6h.I th as been reported that both polyphenols and ascorbic acid present in aqueous Ferocactus echidne extractsc an easily reduce silver ions and can also act as capping agents to prevent the agglomeration of AgNPs [12].R ecently,g old nanoparticles (AuNPs) have been synthesized within 30 min by reducing sodium tetrachloroaurate (NaAuCl 4 )w ith extracts of Abstract:I nt his paper we report on af acile,c ost effective and environmental friendly green synthesis method of gold and silvern anoparticles (NPs) by using quercetin as reducing agent. Theo btained NPs were characterized by transmission electronm icroscopy (TEM), energyd ispersive spectroscopy (EDS), dynamicl ight scattering (DLS) and UV-Vis spectroscopy and parameters such as pH, ionic strength and temperature,e ffectively affecting shape and size of NPs,h ave been carefully studieda nd optimized.T he obtained results showed that the synthesized NPs were circular in shape with an average diameter of 5a nd 8nmf or the AuNPs and the AgNPs,r espectively.T he "green" NPs,s howing increased electroactive areas (A EA )a nd electronic transfer rate constants (k 0 ), were successively used to fabr...

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Section: Introductionmentioning

confidence: 81%

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confidence: 99%

Green Synthesis and Characterization of Gold and Silver Nanoparticles and their Application for Development of a Third Generation Lactose Biosensor

et al. 2016

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“…The EC was the predominant catechin in both infusions BB-BD (13.72 and 15.48% in GT and BT, respectively) followed by EGC. In fact, due to the difficulties in elucidation of complex structures of thearubigins and theaflavins due to their similarities in MALDI-TOF mass spectra analyses as indicated by Daglia et al (2014), we have chosen to focus on the predominant catechins in BT that are EGC, EGCG, EC and ECG.…”

Section: Triple Tof-lc-ms-ms Analyses Of Tea Samples Before and Aftermentioning

confidence: 99%

“…The four principal GT catechins in tea leaves are epicatechin (EC, 1-3%), epicatechin gallate (ECG, 3-6%), epigallocatechin (EGC, 3-6%) and epigallocatechin gallate (EGCG,(9)(10)(11)(12)(13). During the oxidative processing in the manufacturing of oolong and black teas, derivatives of flavan-3-ols, theaflavins and thearubigins are formed (Daglia, Antiochia, Sobolev, & Mannina, 2014). Tea bioactive compounds have attracted much attention as potential beneficial agents as their consumption has been associated with reduced incidence of cancer, cardiovascular and coronary heart diseases (Chen & Lin, 2015;da Silva Pinto, 2013;Vertoli et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of green and black tea polyphenols into Saccharomyces cerevisiae improves their bioaccessibility

Jilani

Cilla

Barberá

et al. 2015

Journal of Functional Foods

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“…Influence of tea consumption on human health has been reported . A methodology for studying tea has been published . Much attention is given to the question of authenticity of tea, especially to tracing tea and to assessing authenticity of tea varieties .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ice‐tea quality by DART‐TOF/MS

et al. 2015

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DART (Direct Analysis in Real Time) coupled with Time-of-Flight Mass Spectrometry (TOF/MS) has been used for analyses of ice-teas. The article focuses on quality and authenticity of ice-teas as one of the most important tea-based products on the market. Twenty-one samples of ice-teas (black and green) were analysed. Selected compounds of ice-teas were determined: theobromine, caffeine, total phenolic compounds, total soluble solids, total amino acid concentration, preservatives and saccharides were determined. Fingerprints of DART-TOF/MS spectra were used for comprehensive assessment of the ice-tea samples. The DART-TOF/MS method was used for monitoring the following compounds: citric acid, caffeine, saccharides, artificial sweeteners (saccharin, acesulphame K), and preservatives (sorbic and benzoic acid), phosphoric acid and phenolic compounds. The measured data were subjected to a principal components analysis. The HPLC and DART-TOF/MS methods were compared in terms of determination of selected compounds (caffeine, benzoic acid, sorbic acid and saccharides) in the ice-teas. The DART-TOF/MS technique seems to be a suitable method for fast screening, testing quality and authenticity of tea-based products.

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Untargeted and targeted methodologies in the study of tea (Camellia sinensis L.)

Cited by 48 publications

References 81 publications

Green Synthesis and Characterization of Gold and Silver Nanoparticles and their Application for Development of a Third Generation Lactose Biosensor

Green Synthesis and Characterization of Gold and Silver Nanoparticles and their Application for Development of a Third Generation Lactose Biosensor

Biosorption of green and black tea polyphenols into Saccharomyces cerevisiae improves their bioaccessibility

Evaluation of ice‐tea quality by DART‐TOF/MS

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