Organic acids in Chinese herbs, the long-neglected components, have been reported to possess antioxidant, anti-inflammatory, and antiplatelet aggregation activities; thus they may have potentially protective effect on ischemic heart disease. Therefore, this study aims to investigate the protective effects of two organic acids, that is, citric acid and L-malic acid, which are the main components...

Mutants of Escherichia coli lacking malic dehydrogenase activity (mdh) were incapable of growth on acetate", succinate- or malate/mineral medium. Revertants of mdh strains which had regained the ability to grow on C4-dicarboxylic acids could be divided into two distinct classes. One type of revertant had regained the ability to synthesize functional malic dehydrogenase. The other type of revert...

Abstract The present study aimed to evaluate the sustainable utilization of date palm leaves (DPL) and rice straw (RS) as feed materials for ruminants using an in vitro wireless gas production (GP) technique. Date RS were individually ensiled with lactic or malic acids at 5 g/kg DM 45 days. In a total mixed ration containing concentrate mixture, vegetable/fruits byproducts, untreated RS, bersee...

‘Xiangjiao’ plum (Prunus salicina Lindl.) is a stone fruit that vulnerable to the chilling injury (CI) caused by low-temperature stress. The effects of 1-methylcyclopropene (1-MCP) and ethylene absorbent (EA) treatments on quality malic acid metabolism stored at 4 °C were compared in this study. Compared with control check (CK) EA treatment, fumigation 1.0 mg·L−1 1-MCP for 24 h could more signi...

1. The reversible dissociation of lactic and malic dehydrogenases has been studied in detail and compared with the dissociation properties of triosephosphate dehydrogenase, a-glycerophosphate dehydrogenase, and liver alcohol dehydrogenase. 2. Evidence is presented for the existence of an intermediate form of lactic dehydrogenase with catalytic properties altered during reactivation. 3. The tech...

BACKGROUND The organic acid producer Aspergillus oryzae and Rhizopus delemar are able to convert several alternative carbon sources to malic and fumaric acid. Thus, carbohydrate hydrolysates from lignocellulose separation are likely suitable as substrate for organic acid production with these fungi. RESULTS Before lignocellulose hydrolysate fractions were tested as substrates, experiments wit...

It is known that there is a separation, i.e., compartmentation of organic acids in young maize tissue (11) and that the organic acid prodtucts (specifically malic acid) of CO, fixation are not in complete equilibriuim with mitochondrial pools (9, 10). Thus, there are at least 2 essentially separate metabolic pools of organic acids. Previous work with corn root tips led tus to postulate a metabo...

The optimal ratio of L-malic and L-tartaric acid in relation to other wine components is one of the most important aspects that ultimately determine wine quality during winemaking. Winemakers routinely rely on the judicious use of malolactic fermentation (MLF) after alcoholic fermentation to deacidify and stabilise their wines. However, due to the unreliability of the process and unsuitable sen...

An ion chromatographic method was developed which is able to separate five unsubstituted and hydroxy C4 dicarboxylic acids, succinic, malic, tartaric, maleic and fumaric acid, besides the other unsubstituted C2-C5 dicarboxylic acids, oxalic, malonic and glutaric acids, as well as inorganic ions in samples extracted from atmospheric particulate matter. By the application of this method it was fo...