scholarly journals Qualitative and quantitative changes of nonvolatile compounds and taste profiles in Wuyi rock tea during the manufacturing processes

2021 ◽  
Vol 14 ◽  
Author(s):  
Xiangyang Guo ◽  
Chi-Tang Ho ◽  
Wilfried Schwab ◽  
Zhen Wen ◽  
Hui Zhu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Sensory Evaluation ◽  
Bitter Taste ◽  
Total Sugar ◽  
Threshold Values ◽  
Sugar Amino Acids ◽  
Qualitative And Quantitative ◽  
Umami Taste ◽  
Quantitative Changes

Wuyi rock tea (WRT), a type of oolong tea, is famous for ‘rock flavor’ with characteristic taste and aroma. The qualitative and quantitative changes of the nonvolatile constituents and taste profiles were investigated during the WRT production process by analyzing of polyphenols, caffeine, amino acids, L-theanine and total sugar, coupled with sensory evaluation and determination of dose-over-threshold values. The contents of L-theanine, total sugar, amino acids and some catechins varied considerably except for GA, GCG and GC that increased significantly during the process, while the amount of caffeine was relatively stable. Astringent, bitter, sweet and umami taste properties were predicted. In accordance with the sensory evaluation, there was no umami-like taste in the finished tea that underwent full fire processing, which is essential for WRT to enhance the mellow, heavy taste, and weaken the bitter taste. EGCG and caffeine contributed the most to the astringent, bitter taste of WRT. This study provides a comprehensive profile of the changes in taste characteristics during the WRT manufacturing process.

Synthesis and structure determination of some sugar amino acids related to alanine and 6-deoxymannojirimycin

2001 ◽  
Vol 332 (4) ◽  
pp. 351-361 ◽  
Author(s):  
Miroslav Koóš ◽  
Bohumil Steiner ◽  
Júlia Mičová ◽  
Vratislav Langer ◽  
Marián Ďurı́k ◽  
...  
Keyword(s):  
Amino Acids ◽  
Structure Determination ◽  
Sugar Amino Acids

Preparation and structure determination of two sugar amino acids via corresponding hydantoin derivatives

2000 ◽  
Vol 328 (2) ◽  
pp. 115-126 ◽  
Author(s):  
Miroslav Koóš ◽  
Bohumil Steiner ◽  
Vratislav Langer ◽  
Dalma Gyepesová ◽  
Marián Ďurı́k
Keyword(s):  
Amino Acids ◽  
Structure Determination ◽  
Sugar Amino Acids ◽  
Hydantoin Derivatives

Use of NMR spectroscopy in the analysis of carnosine and free amino acids in fermented sausages during ripening

2015 ◽  
Vol 69 (10) ◽  
Author(s):  
Marcel Mati ◽  
Ladislav Staruch ◽  
Michal Šoral
Keyword(s):  
Amino Acids ◽  
Nmr Spectroscopy ◽  
Free Amino Acids ◽  
Free Amino ◽  
High Fat ◽  
Nmr Method ◽  
Fermented Sausages ◽  
Quantitative Changes ◽  
First Time

AbstractQuantitative changes of carnosine and free amino acids in high-fat (43-50 mass %) fermented sausages during ripening were analysed using a 600 MHz VNMRS NMR spectrometer. Seven free amino acids were identified in the samples and a relatively high content of carnosine was observed in the final stage of ripening. The NMR method for the determination of free amino acids and carnosine content applied in this work has been used for the first time and it has proven to be suitable for the analysis of fermented sausages.

scholarly journals Determination of asparagine, glutamine and pyrrolidonecarboxylic acid in total enzymic hydrolysates of peptides and glycopeptides by gas–liquid chromatography

1973 ◽  
Vol 133 (3) ◽  
pp. 551-561 ◽  
Author(s):  
Hedy Hediger ◽  
Richard L. Stevens ◽  
Hans Brandenberger ◽  
Karl Schmid
Keyword(s):  
Amino Acids ◽  
Liquid Chromatography ◽  
Quantitative Determination ◽  
Room Temperature ◽  
Butyl Ester ◽  
Gas Liquid Chromatography ◽  
Qualitative And Quantitative ◽  
Elution Pattern

A new procedure for the qualitative and quantitative determination of asparagine, glutamine and pyrrolidonecarboxylic acid in total enzymic hydrolysates of peptides and glycopeptides based on g.l.c. has been developed. Under the conditions of esterification and trifluoroacetylation N-trifluoroacetylaspartic acid mono-n-butyl ester was formed from asparagine and N-trifluoroacetylglutamic acid mono-n-butyl ester from both glutamine and pyrrolidonecarboxylic acid. To distinguish between the latter two compounds, the esterification was carried out at room temperature yielding 30% of esterified pyrrolidonecarboxylic acid but less than 1% of esterified glutamine. In extending the g.l.c. of amino acids, the previously unknown positions in the g.l.c. elution pattern of the following amino acids could also be reproducibly determined: carboxymethylcysteine, homoserine, hydroxylysine and ∈-methyl-lysine. Further, certain glycopeptides were investigated and the artifacts due to their carbohydrate moieties were determined.

ChemInform Abstract: Synthesis and Structure Determination of Some Sugar Amino Acids Related to Alanine and 6-Deoxymannojirimycin.

ChemInform ◽  
2010 ◽  
Vol 32 (41) ◽  
pp. no-no
Author(s):  
Miroslav Koos ◽  
Bohumil Steiner ◽  
Julia Micova ◽  
Vratislav Langer ◽  
Marian Durik ◽  
...  
Keyword(s):  
Amino Acids ◽  
Structure Determination ◽  
Sugar Amino Acids

Expression of laminin and beta-1 integrin in embryonic, neonatal, and adult rat heart

1991 ◽  
Vol 49 ◽  
pp. 182-183
Author(s):  
R.L. Price ◽  
T.K. Borg ◽  
L. Terracio ◽  
M. Nakagawa
Keyword(s):  
Temporal Expression ◽  
Qualitative And Quantitative ◽  
Adult Rat ◽  
Cytoplasmic Face ◽  
Extracellular Matrix Components ◽  
Basement Membrane Component ◽  
Beta 1 Integrin ◽  
Quantitative Changes ◽  
Cytoskeletal Elements ◽  
External Face

Little is known about the temporal expression of extracellular matrix components (ECM) and its receptors during development of the heart. Recent reports have shown that ECM components undergo both qualitative and quantitative changes during development, and it is believed that ECM components are important in the regulation of cell migration and cell:cell and cell:ECM recognition and adhesion.Integrins are transmembrane glycoproteins which bind several ECM components on their external face and cytoskeletal elements on the cytoplasmic face. Laminin is a basement membrane component which has been recognized as an important site for cell adhesion. Both the integrins and laminin are expressed early in development and continue to be expressed in the adult heart. With their documented roles in cell recognition, and cell:cell and cell:ECM migration and adhesion these proteins appear to be important components in development of the heart, and their temporal expression may play a pivotal role in morphogenesis and myofibrillogenesis of the heart.

Comparison of standardised lymphoscintigraphic function test and high resolution sonography of the lymphoedema of legs

Phlebologie ◽  
2008 ◽  
Vol 37 (05) ◽  
pp. 247-252 ◽  
Author(s):  
V. S. Brauer ◽  
W. J. Brauer
Keyword(s):  
Lower Leg ◽  
Clinical Findings ◽  
Lower Limbs ◽  
Fatty Tissue ◽  
Qualitative And Quantitative ◽  
Function Test ◽  
Unreliable Method ◽  
Negative Conclusion ◽  
Fine Disperse

SummaryPurpose: Comparison of qualitative and quantitative sonography with the lymphoscintigraphic function test and clinical findings in legs. Patients, methods: In 33 patients a lymphoscintigraphic function test of legs combined with measurement of lymph node uptake was performed and subsequently compared with sonography. Sonographic criteria were: Thickness of cutis, thickness of subcutanean fatty tissue and presence of liquid structures or fine disperse tissue structure of lower limbs, foots and toes. Results: In 51 legs uptake values lie in the pathologic area, in four legs in the grey area and in ten legs in the normal area. The cutis thickness in the lower leg shows no significant correlation with the uptake. The determination of the thickness of the subcutanean fatty tissue of the lower leg and of the cutis thickness of the feet turned out to be an unreliable method. In 47% of the medial lower legs and in 57% of the lateral lower legs with clinical lymphoedema sonography is falsely negative. Conclusion: Early lymphoedema is only detectable with the lymphoscintigraphic function test. In the case of clinical lymphoedema clinical examination is more reliable than sonography.

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