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Calcium diascorbate, also known as calcium ascorbate (CAS 5743‑27‑1), is the calcium salt of L‑ascorbic acid. It consists of two ascorbate anions paired with one calcium cation. It appears as white crystalline powder, soluble in water, with mild, less acidic taste compared to pure vitamin C. It functions as a combined source of vitamin C and calcium. Approved as food additive and nutritional fortifier, widely used in beverages, dietary supplements and processed foods for antioxidant and mineral‑vitamin enrichment purposes.
Calcium diascorbate (calcium ascorbate, CAS 5743‑27‑1) is the calcium salt of L‑ascorbic acid, globally approved by JECFA, EFSA and national food regulatory bodies as a permitted food additive and nutrient fortifier. Compared with free ascorbic acid, it features reduced acidity, bringing less sour taste to food matrices, while simultaneously providing bioavailable vitamin C and calcium. It serves dual functions as antioxidant and nutritional supplement in food manufacturing.
As an antioxidant, it suppresses enzymatic browning and oxidative deterioration in fresh‑cut fruits, vegetables and processed plant‑based foods. It inhibits colour fading, flavour degradation and vitamin loss during processing and storage. Unlike acidic ascorbic acid, calcium diascorbate will not drastically lower product pH, so it suits neutral and near‑neutral food systems. It is applied in fruit fillings, canned goods and frozen produce to maintain visual quality and extend shelf‑life without introducing sharp sour notes.
Nutritional fortification represents another major application. It is widely incorporated into functional beverages, powdered drink mixes, cereal products and bakery items to enrich both vitamin C and calcium content. For dietary supplement raw materials, it is popular in tablet and capsule formulations. Its mild taste avoids flavour distortion, an advantage over pure ascorbic acid, especially for neutral‑flavoured nutritional foods targeted at sensitive consumer groups.
It is also utilised in meat processing. Calcium diascorbate assists colour stabilisation for cured meat products. It accelerates nitrite reduction and improves red colour formation, while mitigating nitrosamine generation risk within permitted dosage ranges. Formulators strictly follow regional usage limits, preventing excessive calcium intake from cumulative fortification across multiple food sources.
Nevertheless, it has application constraints. It shows weaker antioxidant performance under strongly acidic conditions compared with free ascorbic acid. High temperature for prolonged heating may trigger partial degradation of ascorbate moiety, so high‑heat sterilisation processes require dosage adjustment. Excessive addition may cause subtle chalky off‑notes in delicate‑flavour products.
In summary, calcium diascorbate is a multi‑functional food ingredient. Its key food applications cover anti‑browning preservation for plant‑derived foods, dual‑nutrient fortification in beverages, cereals and supplements, and colour improvement in cured meat. Its main advantage lies in low acidity, suitable for neutral‑pH formula systems. Manufacturers must comply with local additive specifications, optimise processing parameters and control addition levels to prevent sensory defects and nutrient over‑intake risks.
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