Topic
Citric acid
About: Citric acid is a research topic. Over the lifetime, 17745 publications have been published within this topic receiving 277125 citations. The topic is also known as: citrate & H3cit.
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TL;DR: This study demonstrated that carbon and nitrogen metabolism, and the tricarboxylic acid (TCA) cycle and receiver operating characteristics of the seedling roots were important to resisting salt stress and showed a regular decreasing trend from wild soybean to cultivated soybean.
Abstract: Soybean is an important economic crop that is continually threatened by abiotic stresses, especially salt stress. Wild soybean is an important germplasm resource for the breeding of cultivated soybean. The root system plays a very important role in plant salt tolerance. To explore the salt tolerance-related mechanisms among Soja, we have demonstrated the seedling roots’ growth and metabolomics in wild soybean, semi-wild soybean and cultivated soybean under two types of salt stress by using gas chromatography-mass spectrometry. We characterized 47 kinds of differential metabolites under neutral salt stress, and isoleucine, serine, l-allothreonine, glutamic acid, phenylalanine, asparagines, aspartic acid, pentadecanoic acid, lignoceric acid, oleic acid, galactose, tagatose, d-arabitol, dihydroxyacetone, 3-hydroxybutyric acid and glucuronic acid increased significantly in the roots of wild soybean seedlings. However, these metabolites were suppressed in semi-wild and cultivated soybeans. Amino acid, fatty acid, sugars and organic acid synthesis and the secondary metabolism of antioxidants increased significantly in the roots of wild soybean seedling. Under alkaline salt stress, wild soybean contained significantly higher amounts of proline, glutamic acid, aspartic acid, l-allothreonine, isoleucine, serine, alanine, arachidic acid, oleic acid, cis-gondoic acid, fumaric acid, l-malic acid, citric acid, malonic acid, gluconic acid, 5-methoxytryptamine, salicylic acid and fluorene than semi-wild and cultivated soybeans. Our study demonstrated that carbon and nitrogen metabolism, and the tricarboxylic acid cycle and receiver operating characteristics (especially the metabolism of phenolic substances) of the seedling roots were important to resisting salt stress and showed a regular decreasing trend from wild soybean to cultivated soybean. The metabolomics’s changes were critical factors in the evolution of salt tolerance among Soja. This study provides new insights into salt tolerance in soybean, and presents quantitative parameters for a salt tolerant soybean breeding system, which is conducive to the rational use and protection of wild soybean resources.
78 citations
TL;DR: In this article, the authors employed statistical experimental methods (SEM) to study the effects of glutamic acid, citric acid, glycerol and initial medium pH on the production of poly(γ-glutamic acid) (γ-PGA) by Bacillus licheniformis CCRC 12826 in shaken cultures.
78 citations
TL;DR: In this article, the effects of sour substances (citric acid, acetic acid, lactic acid, malic acid, tartaric acid and ascorbic acid) on the rheological properties of cornstarch pastes were studied by steady shear and dynamic oscillatory viscoelasticity measurements, intrinsic viscosity measurements and microscopic observation.
78 citations
Patent•
16 Apr 1981
TL;DR: In this paper, a novel nifedipine-containing solid pharmaceutical preparation composition comprising a mixture of nifedsipine and at least one 1st(a) substance selected from polyvinyl pyrrolidone, methyl cellulose, hydroxypropyl cellulose and hydroxyethylpropylmethyl cellulose was proposed.
Abstract: A novel nifedipine-containing solid pharmaceutical preparation composition comprising a mixture of nifedipine and at least one 1st(a) substance selected from polyvinyl pyrrolidone, methyl cellulose, hydroxypropyl cellulose and hydroxypropylmethyl cellulose; a mixture of nifedipine, at least one 1st(b) substance selected from polyvinyl pyrrolidone, urea, citric acid mannitol, succinic acid, methyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose and amino acid, and at least one 2nd substance selected from a surface active agent, polyethylene glycol, propylene glycol, glycerol, a glycerol fatty acid ester and a vegetable oil; or a mixture of nifedipine, the 1st(b) substance, the 2nd substance and calcium lactate. The composition of this invention can increase the bioavailability of nifedipine and makes it possible to provide a nifedipine-containing pharmaceutical preparation which has small bulk and can be easily administered.
77 citations
TL;DR: In this paper, the results indicate that the Pb adsorption followed multiple first-order kinetics and varied greatly with the surface properties of the Fe oxides formed at various citrate/Fe(II) molar ratios (MRs) of 0.001, 0.01, and 0.1.
77 citations