Natural sources of vitamin C
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Plant-Based Natural Sources of Vitamin C
Vitamin C, also known as ascorbic acid, is primarily obtained from plant-based foods. Common fruits and vegetables rich in vitamin C include oranges, lemons, apples, bananas, grapes, cabbage, potatoes, lettuce, brinjal (eggplant), guava, pineapple, longan, spinach, kiwifruit, pomegranate, tomato, carrot, radish, bitter gourd, garlic, onion, aubergine, bell pepper, pea, common bean, pumpkin, pawpaw (papaya), cucumber, cauliflower, and parsley. Some less commonly known sources, such as the leaves of Begonia floccifera and Begonia malabarica, have also been identified as containing vitamin CAriharan2012Safnowandi2022Gutowska2019+2 MORE.
Vitamin C Content in Fruits and Vegetables
The vitamin C content varies widely among different foods. For example, lemons contain about 85 mg per fruit, guava has 86 mg per 100 grams, pineapple and longan provide about 80 mg per 100 grams, and spinach contains 8.5 mg per 30 grams. Indian tamarind is noted for its high vitamin C content, with 89.44 mg per 100 grams. Among vegetables, purple cabbage and parsley are particularly rich in vitamin C, with purple cabbage reaching up to 326.9 mg per 100 gramsSafnowandi2022Gutowska2019Paciolla2019.
Bioaccessibility and Processing Effects
The bioaccessibility of vitamin C—how much is available for absorption after digestion—can differ depending on the fruit or vegetable. For instance, parsley, purple cabbage, red pepper, grapefruit, and orange have high bioaccessibility values (53–86%). Interestingly, processed fruits and vegetables can sometimes contain more vitamin C than their fresh counterparts, especially in the autumn and winter seasons when fresh produce may lose nutrients during storageCarr2013Paciolla2019.
Potatoes as a Key Source
Potatoes are a significant source of vitamin C, especially in Europe, where they contribute about 20% of the dietary intake. Their importance is due to both their relatively high vitamin C content and their ability to be stored for long periods, ensuring year-round availability.
Extraction and Supplementation
Vitamin C can be extracted from a wide range of natural sources, including fruits, vegetables, algae, and leaves. Modern green extraction techniques, such as ultrasound-assisted and microwave-assisted extraction, are used to obtain vitamin C efficiently from these sources. While synthetic vitamin C is chemically identical to the natural form, fruits and vegetables also provide other beneficial nutrients and phytochemicals that may enhance its effectsHughes1971Öztürk2022.
Conclusion
Natural sources of vitamin C are abundant and diverse, with fruits and vegetables being the primary contributors to dietary intake. The vitamin C content and its bioaccessibility can vary based on the type of food and how it is processed or stored. Including a variety of these plant-based foods in the diet is the best way to ensure adequate vitamin C intake for optimal health.
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