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Citric Acid: Effects, Uses and Safety

Citric acid is a naturally occurring organic acid found in many fruits and widely used as a food additive, preservative, and in various medical and pharmaceutical applications.

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Things worth knowing about "Citric acid"

Citric acid is a naturally occurring organic acid found in many fruits and widely used as a food additive, preservative, and in various medical and pharmaceutical applications.

What Is Citric Acid?

Citric acid (chemical name: 2-hydroxypropane-1,2,3-tricarboxylic acid) is a weak organic acid that occurs naturally in many fruits, especially citrus fruits such as lemons, limes, and grapefruits. It belongs to the group of hydroxy carboxylic acids and is responsible for the characteristic sour taste of many fruits. In the food industry, it is approved as a food additive under the designation E 330.

Sources and Occurrence

Citric acid is found both naturally and in synthetic form:

Natural sources: Lemons, limes, oranges, grapefruits, blackcurrants, strawberries, tomatoes, and other fruits
Biotechnological production: Industrially, citric acid is mainly produced by fermentation using the mold Aspergillus niger from sugar molasses
Chemical synthesis: Possible but rarely used on an industrial scale

Biological Function

In the human body, citric acid plays a central role in the citric acid cycle (also known as the Krebs cycle), a fundamental metabolic pathway for energy production in cells. It is a key intermediate in the conversion of carbohydrates, fats, and proteins into energy (ATP). In addition, it influences mineral metabolism, as it can improve the intestinal absorption of calcium, magnesium, and iron.

Areas of Application

Food Industry

Citric acid is used as an acidulant, preservative, and antioxidant in a wide range of foods and beverages. It slows spoilage, stabilizes color, and enhances the flavor of products such as soft drinks, jams, confectionery, edible oils, and frozen foods.

Pharmacology and Medicine

In medicine and pharmacy, citric acid is used in several areas:

As an excipient in medications, effervescent tablets, and syrups for pH regulation
As a component of anticoagulant solutions for blood preservation
In kidney stone prevention: Citrate (the salt of citric acid) inhibits the formation of calcium oxalate stones and is used prophylactically
As an ingredient in oral care products and tooth whitening agents

Household and Cosmetics

Outside the food and pharmaceutical industries, citric acid is used as an environmentally friendly descaling and cleaning agent. In cosmetic products, it serves as a pH regulator and preservative.

Recommended Intake and Safety

For citric acid as a food additive, the European Union applies the principle of quantum satis, meaning it may be used in amounts that are technologically necessary. No specific ADI (Acceptable Daily Intake) has been established, as citric acid is considered very safe. Under normal dietary conditions, no harmful effects are expected.

Excessive consumption – particularly through concentrated solutions or highly acidic beverages – can cause erosion of tooth enamel. People with a sensitive stomach or gastritis should consume highly acidic foods with caution.

Interactions and Notes

Citric acid enhances the absorption of iron from plant-based sources (non-heme iron), making it nutritionally relevant for individuals with increased iron requirements
In combination with sodium bicarbonate (baking soda), it reacts to produce carbon dioxide – a principle used in effervescent tablets and baking powder
It can increase the solubility and bioavailability of certain minerals such as calcium and magnesium when present in citrate salt form

References

European Food Safety Authority (EFSA): Re-evaluation of citric acid (E 330) as a food additive. EFSA Journal, 2020.
Lotfy, M. et al.: Citric Acid Production by Aspergillus niger Using Egyptian Cane Molasses. Bioscience Journal, 2021.
Heilberg, I. P. & Goldfarb, D. S.: Optimum nutrition for kidney stone disease. Advances in Chronic Kidney Disease, 2013.

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