Monday, July 10, 2023

Citric acid content in blueberries

The acidity of fruit plays a crucial role in determining fruit quality and edible flavor, and it is primarily influenced by the accumulation of organic acids.

The pH of blueberries typically falls within the range of 4.0 to 5.0. According to the pH scale, any substance with a pH below 7 is considered acidic, confirming that blueberries are indeed acidic. Ripe blueberries contain an acid content ranging from 1% to 2%, with citric acid being the primary organic acid at a concentration of 1.2%.

Citric acid constitutes a significant portion, accounting for 77% to 87% of the organic acids present in blueberry fruit. Additionally, quinic and malic acids contribute to 4% to 11% of the total acid content, while small quantities of succinic, tartaric, and shikimic acids are also detected.

As the blueberries ripen, their acid content decreases by approximately 22%, primarily attributed to a decline in citric acid. Research indicates a substantial 30% to 40% reduction in the citric acid level between ripe and overripe fruit, while the other acids undergo negligible changes. Since citric acid dominates the overall composition, although the minor acids experience a proportional increase, these changes merely result in a maximum 2.4% increment relative to the original proportion.
Citric acid content in blueberries

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