Calcium content in oranges

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Calcium Content in Oranges: Key Findings

Calcium Levels in Orange Fruit and Juice

Research shows that oranges contain a moderate amount of calcium, both in the fruit and in juice form. Fresh oranges have a slightly higher calcium content than orange juice from concentrate, with the fruit containing more dietary fiber as well. For example, orange juice from concentrate contains about 13 mg of calcium per 100 ml, while fresh oranges have a bit more calcium per equivalent weight or volume, though the difference is not large .

Calcium in Orange Peel and Residue

Orange peels and juice industry residues are also significant sources of calcium. Studies measuring dried orange residue found an average calcium content of 6.8 mg per gram. This means that 100 grams of orange residue could provide about 68% of the recommended daily intake for calcium, highlighting the nutritional potential of orange by-products . Additionally, extraction studies show that orange peel extracts contain about 91–94 mg of calcium per liter, depending on extraction temperature, confirming that peels are a valuable source of calcium .

Calcium Distribution and Absorption in Oranges

Calcium is distributed throughout the orange, including the peel (flavedo and albedo) and the pulp. The concentration of calcium in the fruit increases as the fruit develops, but the highest calcium transport into the pulp occurs early in fruit development. As the fruit matures, structural changes in the rind can limit calcium movement to the inner tissues .

Importance of Calcium for Orange Growth and Quality

Calcium is not only important for human nutrition but also plays a crucial role in orange plant health. Higher calcium levels in orange leaves and fruit are linked to better growth, higher yields, and improved resistance to pests and diseases. Calcium strengthens cell walls, making leaves firmer and less attractive to insects, which can help reduce disease transmission .

Conclusion

Oranges are a good source of calcium, with both the fruit and its by-products (like peels and juice residue) containing meaningful amounts. While the calcium content in orange juice is slightly lower than in fresh fruit, both forms contribute to dietary calcium intake. Additionally, orange residues and peels are rich in calcium and could be used to boost calcium intake. Calcium is also vital for the growth and health of orange plants, supporting both agricultural productivity and nutritional value for consumers 1234+1 MORE.

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Most relevant research papers on this topic

Calcium Nutrition of Orange and Its Impact on Growth, Nutrient Uptake and Leaf Cell Wall

Optimizing calcium nutrition in oranges leads to better growth, nutrient uptake, enhanced pest/pathogen resistance, and high yield.

2017·

19citations

·D. Eticha et al.

DOI

Absorption and Distribution of Calcium (45Ca) Applied to the Surface of Orange (Citrus sinensis) Fruits at Different Developmental Stages

Surface treatment with 45Ca at fruit set significantly increases calcium transport into the pulp, potentially improving fertilizer efficacy in citrus by spray applications.

2022·

13citations

·C. Bonomelli et al.

Agronomy·

DOI

Effect of Temperature Extraction on the Potassium and Calcium Content in the Lemon and Orange Water Peel Extracts

Increasing extraction temperatures increases the concentration of potassium and calcium in lemon and orange peel extracts, making them valuable sources for maintaining water and electrolyte balance, building strong bones, and proper muscle and nerve function.

2020·

1citation

·Amra Bratovcic

JOURNAL OF ADVANCES IN CHEMISTRY·

DOI

Oranges as fruit and as juice

Orange juice from concentrate is a source of important nutrients like vitamin C, folate, and potassium, with similar content to fresh oranges, but dietary fiber is higher in orange fruit.

2020·

2citations

·K. Stoś et al.

Proceedings of the Nutrition Society·

DOI

Optimization and Validation of a Simple Method for Mineral Potential Evaluation in Citrus Residue

Citrus residue has nutritional potential for human food, providing significant amounts of calcium and iron, which are major public health problems.

2017·

21citations

·J. G. S. Silva et al.

Food Analytical Methods·

DOI

Antioxidant capacity and mineral content of pulp and peel from commercial cultivars of citrus from Brazil.

Citrus peels are richer in minerals and bioactive compounds than pulps, with the Ponkan mandarin peel showing the highest antioxidant capacity.

Highly Cited

2012·

284citations

·Helena Rudge de Moraes Barros et al.

Food chemistry·

DOI

Effects of calcium on cell wall metabolism enzymes and expression of related genes associated with peel creasing in Citrus fruits

Foliar application of 0.5% calcium nitrate significantly reduces fruit creasing rate and suppresses cell wall degrading enzymes genes in 'Hongjiang' orange peel during high occurrence periods of fruit creasing.

Non-RCTRigorous Journal

2022·

20citations

·Bin Huai et al.

PeerJ·

DOI

Bioaccessibility of calcium, iron and magnesium in residues of citrus and characterization of macronutrients.

Cooking in citrus residues increases mineral bioaccessibility and contributes to dietary minerals and macronutrients, with high content of soluble and insoluble fibers.

2017·

26citations

·J. G. S. Silva et al.

Food research international·

DOI

Calcium supplementation and processing variable effects on orange juice quality

Calcium supplementation in orange juice does not negatively affect taste, cloud density, or viscosity, but calcium carbonate fortified juices may have lower flavor scores and calcium phosphate suspensions cause slightly lower color scores.

1991·

4citations

·R. Baker et al.

Journal of Food Science·

DOI

Mineral Content of the Pulp and Peel of Various Citrus Fruit Cultivars

Oranges and pomelos have the highest mineral content, while limes provide calcium, zinc, sodium, and potassium, making them valuable sources for maintaining water and electrolyte balance.

Rigorous JournalHighly Cited

2019·

174citations

·A. Czech et al.

Biological Trace Element Research·

DOI

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