Comparison of chemical compositions of Ilex latifolia Thumb and Camellia sinensis L.

Liang, Yue-Rong; Ma, Weiyang; Lu, Jian-Liang; Wu, Ying

doi:10.1016/s0308-8146(01)00209-6

Cited by 63 publications

(46 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Different amino acid profile reflect the specific characteristics of a protein. Variation of protein amino acid profile from high taxonomic categories to cultivars in different plant groups were reported to have taxonomically intelligible patterns (Watson and Creaser 1975;Yeoh et al 1984;Yeoh et al 1986;Brown and Jeffrey, 1992;Amer and Sheded 1998;Pedo et al 1999;Cook et al 2000;Liang et al 2001). It was reported that proteins having great diversity and different pathways in any plant groups as characteristic macromolecules in taxonomy are reserved in embriyonic or extraembriyonic tissuse of the seeds in different taxa as different amounts and genetically controlled, little effected from environmental conditions in maturing period (Hawkes 1967;Bewley and Black 1994).…”

Section: Discussionmentioning

confidence: 99%

Total Protein and Amino acid Compositions in the Acorns of Turkish Quercus L. Taxa

Özcan

2006

Genet Resour Crop Evol

View full text Add to dashboard Cite

Total protein content and level of 14 amino acid in mature acorns of 20 Quercus taxa from Turkey were studied. The range of total protein amounts between 2.75 and 8.44% were detected among taxa. Similar values in related species and variety level were observed. The amino acid profiles for each taxon were characteristically different and high variability of individual amino acid concentration was present at variety, subspecies and species levels. Different amino acid concentrations, relative percentages and critical values of some amino acids are thought to be additional considerable parameters for diagnosis of Quercus. Generally higher total quantity of amino acids in section Quercus and lower values in section Ilex were observed. When the essential and non-essential amino acids are expressed as a relative percent of total protein indicating quality of proteins, the ratios varied significantly among taxa (p < 0.05). But, no significant difference at section level were detected. Major amino acids were aspartic acid and glutamic acid showing the largest variations and the lowest levels were detected for methionine. Amino acid concentrations ranged from 1665 for aspartic acid to 13 mg/100 g dry wt. for methionine. All taxa had relatively higher amounts of leucin, lysin and valine than other essential amino acids. The highest quantity of protein and amino acids was recorded for Q. infectoria ssp. boissieri and the lowest for Q. pontica. The level of all essential amino acids in examined taxa was not sufficient compared to FAO scoring pattern for children (1985). But, threonine and valine in Q. infectoria ssp. boissieri and isoleucine in Q. petraea ssp. iberica show remarkable concentrations to the requirements. All examined essential amino acids among taxa generally provide adequate levels for adults according to FAO standard.

show abstract

Section: Discussionmentioning

confidence: 99%

Total Protein and Amino acid Compositions in the Acorns of Turkish Quercus L. Taxa

Özcan

2006

Genet Resour Crop Evol

View full text Add to dashboard Cite

show abstract

“…The HPLC was carried out according to our previous method 4 and the chromatographic conditions were as follows: …”

Section: Hplc Analysismentioning

confidence: 99%

“…The major catechins found in green tea leaf include epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG), epicatechin (EC), catechin (C), gallocatechin gallate (GCG), gallocatechin (GC), catechin gallate (CG) 3,4 and O-methylated catechin derivatives. 5,6 Research on biotransformation and pharmacokinetics show that bioavailability and functions of various individual catechins are different and EGCG shows strong activity to control diseases, such as cancer.…”

Section: Introductionmentioning

confidence: 99%

Tea extraction methods in relation to control of epimerization of tea catechins

Liang

Dong

et al. 2007

J Sci Food Agric

Self Cite

View full text Add to dashboard Cite

Effect of water temperature and ethanol concentration on epimerization and extractability of tea catechins was investigated. The results showed that epigallocatechin gallate (EGCG) and epicatechin gallate (ECG) were partially epimerized into gallocatechin gallate (GCG) and catechin gallate (CG), respectively, when tea catechins extract was heated in water solution at 100• C for 2 h or dry tea was extracted in water at 100• C. The epimerization of the catechins was inhibited if the tea catechins extract was heated as solid powder and the dry tea was extracted in 50% (v/v) ethanol or in water at 80• C or below. When the dry tea was extracted in water, the extractability of catechins increased with the increase of extraction temperature up to 100• C, but there was no statistically significant difference in total catechins between 80• C and 100 • C. When teas were extracted using ethanol solutions, the highest extractability of total catechins was obtained in 50% (v/v) ethanol for dry tea and in 75% (v/v) ethanol for fresh tea leaf. In order to reveal the real profiles of tea catechins in teas to be tested, dry tea should be extracted in 50% (v/v) ethanol for 10 min, while fresh tea leaf should be extracted in 75% (v/v) ethanol for 10 min. For commercial extraction, temperature should be controlled at 80• C if water is used as the solvent.

show abstract

“…For these reasons, the chemical composition of two beverage plant species, i.e. Ilex latifolia and Camellia sinensis were investigated and the contents of amino acids, polyphenols, ascorbic acid, caffeine, catechins, and some flavonoids (rutin, myricetin and quercetin) were compared using the HPLC with fluorimetric detection or using HPLC with ultraviolet detection [3,4].…”

Section: Introductionmentioning

confidence: 99%

Determination of Rutin in Green Tea Infusions Using Square‐Wave Voltammetry with a Rigid Carbon‐Polyurethane Composite Electrode

et al. 2006

View full text Add to dashboard Cite

This paper presents a comparative study on the electrochemical behavior of the flavonoid rutin on a rigid carbonpolyurethane composite electrode and on a glassy carbon electrode. The electrochemical oxidation reaction of rutin was found to be quasireversible and affected by adsorption on the electrode surface. A square-wave voltammetric method was developed for determination of rutin in green tea infusion samples using the RCPE electrode and data treatment by a deconvolution procedure. The detection limit achieved in buffered solutions was 7.1 Â 10 À9 mol L À1 using the RCPE and 1.7 Â 10 À8 mol L À1 using the GC electrode the average reproducibility for five determinations being 3.5%.

show abstract

Comparison of chemical compositions of Ilex latifolia Thumb and Camellia sinensis L.

Cited by 63 publications

References 1 publication

Total Protein and Amino acid Compositions in the Acorns of Turkish Quercus L. Taxa

Total Protein and Amino acid Compositions in the Acorns of Turkish Quercus L. Taxa

Tea extraction methods in relation to control of epimerization of tea catechins

Determination of Rutin in Green Tea Infusions Using Square‐Wave Voltammetry with a Rigid Carbon‐Polyurethane Composite Electrode

Contact Info

Product

Resources

About