Disodium succinate CAS 150-90-3

What is Disodium Succinate?

Disodium succinate, also known as sodium succinate (or sodium succinate, commonly called "dried scallop extract"), is the disodium salt of succinic acid (succinic acid). It is commonly available in its hexahydrate form, with the chemical formula:

C4H4Na2O4

Succinate holds a unique position in biochemistry, unmatched by other organic acids—it is a core intermediate in the tricarboxylic acid cycle (TCA cycle, also known as the citric acid cycle or Krebs cycle). The TCA cycle is the central pathway for cellular energy metabolism in almost all aerobic organisms on Earth—from bacteria to humans. In the mitochondrial matrix, succinate is produced from α-ketoglutarate via succinyl-CoA synthase, and subsequently oxidized to fumarate by succinate dehydrogenase (respiratory chain complex II). During this process, electrons are injected via FADH₂ into the respiratory chain—the mitochondrial ATP production pipeline. Succinate is not only an intermediate in energy metabolism but also one of the starting molecules for the biosynthesis of porphyrins and heme. In evolutionary biology, succinate is considered one of the oldest organic acids in the primitive metabolic networks of early Earth—in the Archean eon, when life was still learning how to perform complex carbon metabolism, the dicarboxylic acid carbon skeleton of succinate was already embedded as one of the earliest metabolic intermediates in the core chemical cycles of primitive cells.

Sodium succinate is usually a white crystalline powder or fine granules, easily soluble in water, and has a faint umami flavor characteristic of shellfish and seafood—hence the common name "scallop extract." It is an important component of the umami substances in natural shellfish (scallops, clams, oysters) and shrimp and crab meat.

Food-grade disodium succinate is one of the most widely used seafood flavor enhancers in the condiment industries of China, Japan, and Southeast Asia . However, outside of food, disodium succinate is valued for its status as a natural metabolic intermediate derived from the tricarboxylic acid cycle and its neutral pH buffering capacity.

What is  use of Disodium Succinate?

The non-food applications of disodium succinate are far less extensive than its food-grade applications in the condiment industry. Its non-food value primarily stems from two chemical identities of the succinate ion: first, it is a natural metabolite of the tricarboxylic acid cycle, exhibiting the highest chemical compatibility with the human physiological environment; second, its disodium salt aqueous solution has a near-neutral pH (7-9), providing buffering capacity within the physiological pH range. These two characteristics together determine disodium succinate's exclusive function in the cosmetics field—as a pH adjuster, buffer salt, and protein stabilizer in formulations requiring high biocompatibility.

 Cosmetics and Personal Care Products – Biomimetic Buffers and Gentle pH Adjustments

Cosmetic formulations—especially functional skincare products (serums, creams, masks)—have extremely strict requirements regarding pH. Healthy skin has a surface pH of approximately 4.5–5.5 ("acidic outer membrane"), and maintaining this slightly acidic environment is crucial for the integrity of the skin barrier function, the balance of resident beneficial bacteria, and the inhibition of pathogens. The pH of skincare product formulations must be precisely adjusted to a range compatible with the skin's physiological environment.

Functional positioning of disodium succinate in cosmetics:

Physiologically compatible pH regulation and buffering:

As a natural metabolite of the tricarboxylic acid cycle, succinic acid and succinate are well-known to skin cells—keratinocytes and fibroblasts produce and consume succinic acid daily during normal mitochondrial respiration. The logic behind using succinate as a buffering system in skincare products is that the buffering molecules added to the formula are already "one of their own" in the skin cell metabolic network and will not trigger cellular chemical defenses or stress responses.

Extending the concepts of antioxidants and mitochondrial protection:

In recent years, "mitochondrial health"—maintaining the energy supply of skin cells and reducing mitochondrial reactive oxygen species leakage—has become a new frontier in skincare science. Succinic acid is a direct participant in mitochondrial energy metabolism—some skincare brands incorporate succinic acid or disodium succinate as a "cellular energy support ingredient" into functional creams and serums. Although not a mainstream active ingredient, it holds a place in conceptual formulations such as "energy skincare" and "mitochondrial essence."

Cosmetic products that may be used:

- Face cream suitable for sensitive skin (low-irritant buffered ion selection)

- Functional anti-aging serum

- Post-sunscreen repair products (gentle pH adjustment)

- Face masks and toners

Chemical and Biochemical Research – TCA Cycle Studies and Mitochondrial Function Detection

In basic life science research, disodium succinate is a commonly used reagent for studying mitochondrial respiratory function. The activity of succinate dehydrogenase (SDH, respiratory chain complex II) is measured using sodium succinate as a substrate—after the addition of disodium succinate, mitochondrial respiratory function is quantitatively assessed by monitoring the electron flow rate of the electron transport chain coupled to SDH activity (e.g., by oxygen consumption rate OCR measurement or colorimetric indicator reduction). In cellular energy metabolism research, disodium succinate is a standard substrate for inducing and testing mitochondrial complex II-driven respiratory activity.

 Chemical intermediates – providers of the C4 dicarboxylic acid skeleton in organic synthesis

In fine organic synthesis, disodium succinate or its parent compound succinic acid can serve as starting materials for the synthesis of other molecules containing C4 dicarboxylic acid structures. The C4 carbon skeleton of succinic acid is an increasingly important green chemistry synthon in bio-based chemicals (the production of succinic acid from glucose fermentation is currently one of the most successful bulk platform compounds in biomanufacturing)—it can be used to produce 1,4-butanediol (BDO), γ-butyrolactone (GBL), tetrahydrofuran (THF), and the biodegradable plastic polybutylene succinate (PBS), among others. These derivatives originate from succinic acid rather than disodium succinate, but disodium succinate is a convenient precursor for purifying succinic acid—free succinic acid can be separated by acidification precipitation with sodium salts.

Electroplating and Metal Surface Treatment – Limited Industrial Applications

In industrial electroplating, succinates are sometimes used as auxiliary complexing agents or buffer salts for certain special plating processes (such as nickel plating and zinc alloy plating). Succinate ions in the plating bath form appropriate complexes with metal ions, regulating the deposition potential of the metal ions and the crystal morphology of the coating. However, compared to more mainstream complexing agents such as citrates and EDTA, the use of succinates in electroplating is limited.

Summary

Disodium succinate (also known as succinate) is the disodium salt hexahydrate of succinic acid—a core intermediate in the tricarboxylic acid cycle—with the chemical formula C4H4Na2O4. It is a white crystalline powder, readily soluble in water, and its solution has a neutral to slightly alkaline pH. Succinic acid is one of the oldest organic acid metabolites in the evolutionary history of life on Earth—from the energy metabolism network of primitive cells in the Archean eon to the electron transport chain of modern human mitochondria, the dicarboxylic acid carbon skeleton of succinic acid has remained the central hub of life's energy chemistry for over two billion years of evolution.

In daily life, we come into contact with water-soluble scallop extract at different levels through the physiological buffering protection of protein-based biological drug injections, the gentle pH adjustment of topical ointments and skin preparations, the metabolically compatible buffering system of natural biomimetic skin care products, and the shellfish-characteristic umami provided by disodium succinate in the most widespread food channels—instant noodle seasoning packets and seafood-flavored snacks.

In the non-food sector, the core value of disodium succinate can be summarized by a single chemical logic: its anion is an endogenous metabolite of the tricarboxylic acid (TCA) cycle, possessing the highest natural compatibility with the human physiological environment among all buffers. In the cosmetics industry, it provides a buffering mechanism compatible with the skin cells' own metabolic network for pH adjustment in functional skincare products. In basic life science research, it is the standard substrate for detecting mitochondrial respiratory function. While the volume of non-food applications of disodium succinate is far smaller than its use in food flavoring, the value it provides in each of these scenarios—its physiological compatibility—is unparalleled by any other synthetic buffer. This metabolic passport, issued by the TCA cycle for the succinate anion and spanning two billion years of evolution, is its irreplaceable chemical identity card in pharmaceuticals and cosmetics.