scholarly journals Antioxidant Activity of Amino Acid Sodium and Potassium Salts in Vegetable Oils at Frying Temperatures

2021 ◽  
Author(s):  
Hong-Sik Hwang ◽  
Jill Winkler-Moser ◽  
Sean Liu
Keyword(s):  
Amino Acids ◽  
Antioxidant Activity ◽  
Amino Acid ◽  
Soybean Oil ◽  
Vegetable Oils ◽  
Potassium Salt ◽  
Acid Group ◽  
Concentration Limit ◽  
Potassium Salts ◽  
Sodium Salts

Previous studies reported that several amino acids had strong antioxidant activity in vegetable oils under frying conditions. In this study, the carboxylic acid group of amino acids was converted to a carboxylate group (-COO-Na+ or -COO-K+), a heating study was conducted with amino acid salts in soybean oil at 180 ºC. Sodium salts of amino acids including alanine, phenylalanine, and proline and disodium glutamate had significantly stronger antioxidant activity than the corresponding amino acids, and potassium salts had stronger antioxidant activity than sodium salts. Potassium salts of alanine and phenylalanine more effectively retained tocopherols in soybean oil than the corresponding amino acids during heating. Phenylalanine potassium salt had stronger antioxidant activity than phenylalanine in other vegetable oils including olive, high oleic soybean, canola, avocado, and corn oils. Phenylalanine potassium salt at 5.5. mM more effectively prevented oil oxidation than tert-butyl hydroquinone (TBHQ), a synthetic antioxidant, at its legal concentration limit (0.02%) indicating its feasibility as a new antioxidant for frying.

N-DICHLOROACETYL DERIVATIVES OF SERINE AND THREONINE AND OF THEIR ESTERS AND SODIUM SALTS

1960 ◽  
Vol 38 (7) ◽  
pp. 1135-1140 ◽  
Author(s):  
I. Levi ◽  
A. E. Koller ◽  
G. Laflamme ◽  
J. W. R. Weed
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Antitumor Activity ◽  
Amino Acid Ester ◽  
Amino Group ◽  
Sodium Salts ◽  
Sarcoma 37 ◽  
Walker Carcinoma ◽  
Derivatives Of ◽  
Dichloroacetyl Chloride

The N-dichloroacetyl derivatives of DL-serine and DL-threonine were prepared by the Schotten–Baumann reaction from the amino acids and dichloroacetyl chloride. Negative ninhydrin tests coupled with elementary analyses indicated that only the amino group was acylated. The ester derivatives of these compounds were prepared either by esterification of the N-dichloroacetyl-DL-amino acid with diazomethane or by the reaction of the amino acid ester with dichloroacetyl chloride in the presence of triethylamine. The sodium salts and the esters were tested for antitumor activity against sarcoma 37 in mice and Walker carcinoma 256 in rats. In both cases regression of the tumors was obtained.

scholarly journals Study of antioxidant, anticoagulation and antiaggregational activity in vitro of a number of aliphatic and aromatic amino acid salts

2020 ◽  
Vol 64 (11) ◽  
pp. 77-82
Author(s):  
Natalia A. Bondareva ◽  
◽  
Peotr P. Purygin ◽  
Yury P. Zarubin ◽  
Alexandr V. Samorodov ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Hydrocarbon Chain ◽  
Acid Group ◽  
High Reactivity ◽  
Dual Function ◽  
Synthesis Methods ◽  
Amino Acid Salts ◽  
Acid Salts

Among the nitrogen-containing organic substances there are compounds with a dual function. Particularly important are amino acids. Strictly speaking, amino acids make up only one of the many families of organic compounds. Any organic molecule having at least one amino and one acid group may be assigned to this family. This generally means any hydrocarbon chain that may be branched, with or without other functional groups, aromatic rings, or any other organic structure. Therefore, it becomes clear that the number of amino acids that can be imagined is infinite. Today in Russia there is an urgent need to develop new and effective drugs for the treatment of various diseases. This important task involves organizing the production of new competitive domestic medicines on the market, the development of which is carried out on the basis of the results of fundamental scientific research in the field of organic synthesis. In this regard, derivatives and salts of amino acids are of great interest, due to their high reactivity and wide use in medical practice. We have studied the effect on the hemostasis system of derivatives based on amino acid salts, which is currently a key task of organic, bioorganic and medicinal chemistry. Consideration of the scientific literature on this topic showed the saturation and increasing interest in the influence of amino acid compounds throughout the world. The synthesis of amino acid salts and the study of their effect on the blood curability system was carried out, optimal synthesis methods for an organic compound were developed. Preliminary in vitro preclinical studies of the obtained compounds were carried out in order to find out the prospects for their further use.

Metal Complexes of Biologically Important Ligands, CLXIX [1]. Palladium(II) and Platinum(II) N,O-Chelate Complexes (R3P)(Cl)M(α-aminoacidate) with the Anions of Serine, Threonine, 3,4-Dehydroproline and 4-Hydroxyproline

2008 ◽  
Vol 63 (2) ◽  
pp. 124-128 ◽  
Author(s):  
Elfriede Schuhmann ◽  
Wolfgang Beck
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Metal Complexes ◽  
Nmr Spectra ◽  
Palladium Complexes ◽  
Chelate Complexes ◽  
Potassium Salts ◽  
Single Isomer ◽  
C Nmr

The N,O-chelates M(3,4-dehydro-D,L-prolinate)2 (M = Ni, Cu) have been obtained from Ni(OH)2 or Cu(OH)2 and the amino acid. The complexes (R3P)(Cl)M(α-aminoacidate) (M= Pd, Pt) have been synthesized from the chloro bridged compounds (R3P)(Cl)M(μ-Cl)2M(PR3)Cl (M = Pd, Pt; R = Et, n-Bu, Ph) and the potassium salts of the α-amino acids D,L-serine, D,L-threonine, 3,4-dehydro-D,Lproline and 4-hydroxy-L-proline. According to the 31P NMR and 13C NMR spectra the complexes with serinate and threoninate are formed as mixtures of cis/trans N-M-P isomers, whereas for the palladium complexes with 3,4-dehydroprolinate and 4-hydroxyprolinate a single isomer is observed

A significant pool of amino acids is adsorbed on blood cell membranes

1991 ◽  
Vol 11 (4) ◽  
pp. 223-230 ◽  
Author(s):  
C. Picó ◽  
A. Pons ◽  
A. Palou
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Blood Cell ◽  
Whole Blood ◽  
Wistar Rats ◽  
Cell Membranes ◽  
Acid Group ◽  
High Adsorption ◽  
Polar Amino Acid ◽  
Amino Acid Group

It is well known that the amino acids in the blood are distributed between the plasma and inside the cells. This study was conducted to determine whether amino acids can be located adsorbed on blood cell membranes. The amino acid concentration in the deproteinized haemolysed blood was higher than that in the fraction of blood after removal of the blood cell membranes by centrifugation. These results showed that a pool of amino acids representing 21.1% of the whole blood cell amino acids was adsorbed on the blood cell membranes of adult Wistar rats. The non-polar amino acids showed high adsorption on the membrane, whereas out of the polar amino acid group, only the non-ionic amino acids did adsorb.

Factors Affecting Antioxidant Activity of Amino Acids in Soybean Oil at Frying Temperatures

2019 ◽  
Vol 121 (7) ◽  
pp. 1900091 ◽  
Author(s):  
Hong‐Sik Hwang ◽  
Jill K. Winkler‐Moser ◽  
Kenneth M. Doll ◽  
Mayuresh Gadgil ◽  
Sean X. Liu
Keyword(s):  
Amino Acids ◽  
Antioxidant Activity ◽  
Soybean Oil ◽  
Factors Affecting

Promising new applications of Castanea sativa shell: nutritional composition, antioxidant activity, amino acids and vitamin E profile

2015 ◽  
Vol 6 (8) ◽  
pp. 2854-2860 ◽  
Author(s):  
Francisca Rodrigues ◽  
Joana Santos ◽  
Filipa B. Pimentel ◽  
Nair Braga ◽  
Ana Palmeira-de-Oliveira ◽  
...  
Keyword(s):  
Amino Acids ◽  
Antioxidant Activity ◽  
Vitamin E ◽  
Amino Acid ◽  
Castanea Sativa ◽  
Nutritional Composition ◽  
Macronutrient Composition ◽  
New Applications

The present study was aimed to assess the macronutrient composition and the amino acid and vitamin E profiles of Castanea sativa shell from different production regions of Portugal (Minho, Trás-os-Montes and Beira-Alta).

scholarly journals Amino Acid, Phytochemical Compositions and Antioxidant Activity of Inky Cap Mushroom (Coprinus radiata)

2020 ◽  
Vol 33 (1) ◽  
pp. 53-56
Author(s):  
Thidarat Somdee ◽  
Rattaphol Kraiklang ◽  
Chatchada Mahaweerawat ◽  
Suneerat Yangyuen ◽  
Udomsak Mahaweerawat ◽  
...  
Keyword(s):  
Amino Acids ◽  
Antioxidant Activity ◽  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Water Extract ◽  
Essential Amino Acids ◽  
Total Phenolic ◽  
High Concentration ◽  
Antioxidant Power

Evaluation of the amino acid composition, phytochemical properties and antioxidant activity of Coprinus radiata mushrooms was conducted. Free amino acid composition of fresh mushrooms was analyzed by LC-MS/MS. The phytochemical properties analysis included total phenolic compound content and total flavonoid content of these mushrooms. Furthermore, antioxidant activity assays were performed using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP). Based on the results shown that a high concentration of non-essential amino acids, especially those of arginine and glutamic acid, were observed. However, isoleucine and leucine were major essential amino acids in these mushrooms. The ethanolic extract of C. radiata showed higher phytochemical contents and antioxidant activity than those of the water extract. It suggested that the C. radiata is a natural source containing some essential amino acids, a high amount of phytochemical properties and high antioxidant activity, potentially having medicinal and nutritional properties that provide health benefits.

Complexes of 18-crown-6 macrocyclic ethers obtained from ethereal solvents. Complexes of potassium and sodium salts with host:guest ratios of 1:2 and 1:3

1986 ◽  
Vol 64 (4) ◽  
pp. 808-815 ◽  
Author(s):  
André Rodrigue ◽  
John W. Bovenkamp ◽  
Benoit V. Lacroix ◽  
Robert A. B. Bannard ◽  
Gerald W. Buchanan
Keyword(s):  
Stability Constant ◽  
Potassium Salt ◽  
Ion Pairs ◽  
Sodium Thiocyanate ◽  
Potassium Salts ◽  
Sodium Salts ◽  
Ultraviolet Spectra ◽  
Macrocyclic Ethers ◽  
Contact Ion Pairs ◽  
Cis Isomer

This paper describes the synthesis, in ethereal solvents, of the complexes of 18-crown-6, the cis–syn–cis and the cis–anti–cis isomers of dicyclohexano-18-crown-6, and dibenzo-18-crown-6 with the potassium and sodium salts of phenoxide and thiocyanate (as well as some potassium oximate salts). In general, the macrocycles break down the aggregates of the potassium salts so that the complexes of the contact ion pairs are isolated. The complex of the cis–anti–cis isomer of dicyclohexano-18-crown-6, however, which has a low stability constant, complexes the dimer of potassium phenoxide to give a complex with a 1:2 host:guest ratio. This appears to be the first example of a 1:2 host:guest ratio of a potassium salt with an 18-crown-6 macrocycle. There is a greater tendency for the complexes of sodium salts to have host:guest ratios less than 1:1. Thus, 18-crown-6 gives complexes with sodium phenoxide and sodium thiocyanate which have 1:3 and 1:2 host:guest ratios, respectively. Host:guest ratios of 1:2 are also obtained for the two above-mentioned isomers of dicyclohexano-18-crown-6 and for dibenzo-18-crown-6 with sodium phenoxide. Sodium thiocyanate gives complexes with either 1:1 or 1:2 host:guest ratios depending on the macrocycle. With dibenzo-18-crown-6, sodium thiocyanate gives a 1:1 complex in which one molecule of the solvent used is incorporated into the complex. The infrared and ultraviolet spectra of the complexes are discussed.

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