Olivine dissolution at 25°C: Effects of pH, CO2, and organic acids

Our objective was to determine the effects of organic acids and pH on the rate at which selected strains ofEscherichia coli O157:H7 die in acid solutions representative of acidified pickle products (pH < 4.6). We used gluconic acid/sodium gluconate (pKa = 3.7) as a noninhibitory buffer to maintain pH at selected values in the absence of other organic acids. This was possible because we found that the inhibitory effects of this acid onE. coli strains at pH 3.1 were independent of acid concentration over a range of 2 to 200 mM. By this method, the lethal effects of acetic acid solutions (100 to 400 mM) at selected pH values between 3.1 and 4.1 were compared with the effects of pH alone (as determined using gluconate buffer). We found D-values were two- to fourfold lower with acetic acid compared with the effect of pH alone for simulated pickle brines in this pH range. Glutamic acid, an amino acid that is known to enhance acid resistance inE. coli and is a component of pickle brines, protected theE. coli strains from the specific effects of acetic acid.

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Effects of pH Adjustment and Sodium Ions on Sour Taste Intensity of Organic Acids

Journal of Food Science ◽

10.1111/j.1750-3841.2009.01127.x ◽

2009 ◽

Vol 74 (4) ◽

pp. S165-S169 ◽

Cited By ~ 11

Author(s):

E.R.D. Neta ◽

S.D. Johanningsmeier ◽

M.A. Drake ◽

R.F. McFeeters

Keyword(s):

Organic Acids ◽

Taste Intensity ◽

Sodium Ions ◽

Sour Taste ◽

Ph Adjustment ◽

Effects Of Ph

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Life in acid: interactive effects of pH and natural organic acids on growth, development and locomotor performance of larval striped marsh frogs (Limnodynastes peronii)

Journal of Experimental Biology ◽

10.1242/jeb.028472 ◽

2010 ◽

Vol 213 (8) ◽

pp. 1293-1300 ◽

Cited By ~ 20

Author(s):

B. J. Barth ◽

R. S. Wilson

Keyword(s):

Organic Acids ◽

Interactive Effects ◽

Locomotor Performance ◽

Effects Of Ph ◽

Growth Development

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Effects of pH, organic acids, and competitive cations on mercury desorption in soils

Chemosphere ◽

10.1016/j.chemosphere.2007.05.033 ◽

2007 ◽

Vol 69 (10) ◽

pp. 1662-1669 ◽

Cited By ~ 72

Author(s):

Y.D. Jing ◽

Z.L. He ◽

X.E. Yang

Keyword(s):

Organic Acids ◽

Effects Of Ph

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Effects of pH, organic acids, and inorganic ions on lead desorption from soils

Environmental Pollution ◽

10.1016/j.envpol.2005.11.010 ◽

2006 ◽

Vol 143 (1) ◽

pp. 9-15 ◽

Cited By ~ 113

Author(s):

J.Y. Yang ◽

X.E. Yang ◽

Z.L. He ◽

T.Q. Li ◽

J.L. Shentu ◽

...

Keyword(s):

Organic Acids ◽

Inorganic Ions ◽

Effects Of Ph

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Microbial treatment of kraft pulp wastewater pretreated with ozone

Water Science & Technology ◽

10.2166/wst.1997.0537 ◽

1997 ◽

Vol 35 (2-3) ◽

pp. 277-282 ◽

Cited By ~ 7

Author(s):

Y. Nakamura ◽

T. Sawada ◽

F. Kobayashi ◽

M. Godliving

Keyword(s):

Oxalic Acid ◽

Organic Acids ◽

Activated Sludge ◽

Polyurethane Foam ◽

Maleic Acid ◽

Kraft Pulp ◽

Microbial Growth ◽

Alkaline Condition ◽

Substrate Consumption ◽

Effects Of Ph

Kraft pulp wastewater was treated with a combination of ozone and activated sludge. The effects of pH on the degradation of lignin and the production of organic acids were examined experimentally in the ozonolysis of wastewater. The strong alkaline condition enhanced not only the degradation of lignin but also the production of organic acids. The dynamic behaviours of microbial growth and substrate consumption were investigated in the biodegradation of organic acids using activated sludge. Maleic acid and oxalic acid in the ozonized wastewater were degraded completely by the activated sludge. The immobilized activated sludge culture using polyurethane foam was effective in degrading organic acids.

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