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Related Concept Videos

Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are produced, leading to a...
Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
Acidity and Basicity of Alcohols and Phenols02:36

Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and HCO3−  values are examined to...
Bicarbonate-Carbonic Acid Buffer01:22

Bicarbonate-Carbonic Acid Buffer

The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...

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Related Experiment Video

Updated: Jul 6, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
06:27

Fast and Accurate Exhaled Breath Ammonia Measurement

Published on: June 11, 2014

Drinking influences exhaled breath condensate acidity.

Tamás Kullmann1, Imre Barta2, Balázs Antus2

  • 1Department of Pathophysiology, National Korányi Institute for TB and Pulmonology, Pihenő u. 1, Budapest, 1529, Hungary. kullmanndoki@hotmail.com.

Lung
|March 28, 2008
PubMed
Summary

Drinking acidic or neutral beverages significantly alters exhaled breath condensate pH in healthy individuals. This finding is crucial for understanding variability in breath condensate analysis for airway pathology.

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Last Updated: Jul 6, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
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Real-Time, Semi-Automated Fluorescent Measurement of the Airway Surface Liquid pH of Primary Human Airway Epithelial Cells
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Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry
08:23

Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry

Published on: March 9, 2018

Area of Science:

  • Respiratory Medicine
  • Analytical Chemistry

Background:

  • Exhaled breath condensate (EBC) analysis is an emerging non-invasive technique for assessing airway inflammation and pathology.
  • The influence of dietary intake, specifically food and beverages, on EBC composition remains under-investigated.
  • Understanding factors affecting EBC pH is critical for accurate interpretation of results.

Purpose of the Study:

  • To investigate the impact of consuming an acidic (Coca-Cola) versus a neutral (mineral water) beverage on exhaled breath condensate (EBC) pH.
  • To assess concurrent changes in capillary blood and urine pH following beverage consumption.
  • To determine if beverage intake contributes to the variability observed in EBC pH measurements.

Main Methods:

  • A study involving 12 healthy volunteers.
  • Collection of EBC, capillary blood, and urine samples pre- and post-beverage consumption.
  • Analysis of sample pH using a blood gas analyzer.
  • Comparison of pH changes after drinking 1 liter of either Coca-Cola or mineral water.

Main Results:

  • A small baseline variation (0.13+/-0.03) in EBC pH was observed between samples collected within 15 minutes.
  • Significant decreases in EBC pH were recorded after drinking: from 6.29 to 6.24 (p<0.03) with coke, and from 6.37 to 6.22 (p<0.003) with water.
  • Coca-Cola consumption also led to significant alterations in blood and urine pH.

Conclusions:

  • Beverage consumption demonstrably influences the pH of exhaled breath condensate.
  • Dietary intake, including common beverages, is a significant factor contributing to the variability in EBC pH.
  • These findings necessitate consideration of recent food and drink intake when interpreting EBC analysis for clinical purposes.