Evaluation of different analytical methodologies for the analysis of amino acids in plant extracts

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
M Nasimullah Qureshi ◽  
G Stecher ◽  
MA Hashir ◽  
T Sultana ◽  
G Abel ◽  
...  
Keyword(s):  
Amino Acids ◽  
Plant Extracts

scholarly journals Greener Approach towards Corrosion Inhibition

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Neha Patni ◽  
Shruti Agarwal ◽  
Pallav Shah
Keyword(s):  
Heavy Metals ◽  
Amino Acids ◽  
Plant Extracts ◽  
Corrosion Inhibitors ◽  
Organic Dyes ◽  
Plant Origin ◽  
Toxic Compounds ◽  
Green Inhibitors ◽  
Protective Films ◽  
Organic Corrosion Inhibitors

Corrosion control of metals is technically, economically, environmentally, and aesthetically important. The best option is to use inhibitors for protecting metals and alloys against corrosion. As organic corrosion inhibitors are toxic in nature, so green inhibitors which are biodegradable, without any heavy metals and other toxic compounds, are promoted. Also plant products are inexpensive, renewable, and readily available. Tannins, organic amino acids, alkaloids, and organic dyes of plant origin have good corrosion-inhibiting abilities. Plant extracts contain many organic compounds, having polar atoms such as O, P, S, and N. These are adsorbed on the metal surface by these polar atoms, and protective films are formed, and various adsorption isotherms are obeyed. Various types of green inhibitors and their effect on different metals are mentioned in the paper.

scholarly journals Identification of Auxin Metabolites in Brassicaceae by Ultra-Performance Liquid Chromatography Coupled with High-Resolution Mass Spectrometry

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2615 ◽  
Author(s):  
Panagiota-Kyriaki Revelou ◽  
Maroula G. Kokotou ◽  
Violetta Constantinou-Kokotou
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Liquid Chromatography ◽  
High Resolution ◽  
Plant Extracts ◽  
High Resolution Mass Spectrometry ◽  
Ultra Performance Liquid Chromatography ◽  
Charge Ratio ◽  
High Resolution Mass ◽  
Resolution Mass

Auxins are signaling molecules involved in multiple stages of plant growth and development. The levels of the most important auxin, indole-3-acetic acid (IAA), are regulated by the formation of amide and ester conjugates with amino acids and sugars. In this work, IAA and IAA amide conjugates with amino acids bearing a free carboxylic group or a methyl ester group, along with some selected IAA metabolites, were studied in positive and negative electrospray ionization (ESI) modes, utilizing high-resolution mass spectrometry (HRMS) as a tool for their structural analysis. HRMS/MS spectra revealed the fragmentation patterns that enable us to identify IAA metabolites in plant extracts from eight vegetables of the Brassicaceae family using a fast and reliable ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-QToF-MS) method. The accurate m/z (mass to charge) ratio and abundance of the molecular and fragment ions of the studied compounds in plant extracts matched those obtained from commercially available or synthesized compounds and confirmed the presence of IAA metabolites.

Observations sur une méthode de dosage de la proline libre dans les extraits de plantes

1979 ◽  
Vol 57 (18) ◽  
pp. 1851-1854 ◽  
Author(s):  
Roger Paquin ◽  
Pierre Lechasseur
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Plant Extracts ◽  
Correction Factors ◽  
Basic Amino Acids ◽  
Precise Estimation ◽  
Extraits De Plantes

Folin-type resins used to purify plant extracts of basic amino acids that interfere with proline determination are not selective and partially retain this amino acid and the basic amino acids. Therefore, their use should be avoided, otherwise correction factors must be introduced. Modifications to another method allow a more rapid and precise estimation of proline.

Oxidative decarboxylation of amino acids by plant extracts

1988 ◽  
Vol 16 (6) ◽  
pp. 972-973 ◽  
Author(s):  
TERENCE A. SMITH ◽  
JACQUELINE H. A. MARSHALL
Keyword(s):  
Amino Acids ◽  
Plant Extracts ◽  
Oxidative Decarboxylation

Direct Analysis of Underivatized Amino Acids in Plant Extracts by LC-MS/MS (Improved Method)

2019 ◽  
pp. 403-414
Author(s):  
Björn Thiele ◽  
Michelle Hupert ◽  
Beatrix Santiago-Schübel ◽  
Marco Oldiges ◽  
Diana Hofmann
Keyword(s):  
Amino Acids ◽  
Plant Extracts ◽  
Direct Analysis ◽  
Improved Method ◽  
Underivatized Amino Acids

scholarly journals o-Quinones formed in plant extracts. Their reactions with amino acids and peptides

1969 ◽  
Vol 112 (5) ◽  
pp. 609-616 ◽  
Author(s):  
W. S. Pierpoint
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Plant Extracts ◽  
Thiol Group ◽  
Amino Group ◽  
Amino Groups ◽  
Terminal Amino Acid ◽  
Secondary Reactions ◽  
Terminal Amino ◽  
Group 5

1. The reactions of amino acids and peptides with the o-quinones produced by the enzymic oxidation of chlorogenic acid and caffeic acid have been studied manometrically and spectrophotometrically. 2. Amino acids, except lysine and cysteine, react primarily through their α-amino groups to give red or brown products. These reactions, which compete with the polymerization of the quinones, are followed by secondary reactions that may absorb oxygen and give products with other colours. 3. The ∈-amino group of lysine reacts with the o-quinones in a similar way. The thiol group of cysteine reacts with the quinones, without absorbing oxygen, giving colourless products. 4. Peptides containing cysteine react with the o-quinones through their thiol group. 5. Other peptides, such as glycyl-leucine and leucylglycine, react primarily through their α-amino group and the overall reaction resembles that of the N-terminal amino acid except that it is quicker. 6. With some peptides, the secondary reactions differ from those that occur between the o-quinones and the N-terminal amino acids. The colours produced from carnosine resemble those produced from histidine rather than those from β-alanine, and the reactions of prolylalanine with o-quinones are more complex than those of proline.

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