Citric-Acid Guide
Citric Acid (E330) is the most widely used natural fermented food acidity regulator worldwide. Featuring non-toxicity, anti-corrosion, color protection and metal ion chelation properties, it is applied in over 65% of food processing scenarios. Three mainstream food-grade specifications are available on the market: Monohydrate Citric Acid, Anhydrous Citric Acid and Sodium Citrate. Rizhao Huikun Trading clearly sorts out their product characteristics and application scenarios to help enterprises select raw materials accurately.
1. Basic Physicochemical Properties & Production Technology
Domestic food-grade citric acid and sodium citrate are all produced via corn fermentation process. Leading manufacturers including Yinxuan, TTCA and Jinhe adopt membrane separation and continuous ion exchange purification technology. The purity of finished products meets national standards, with heavy metal and ash indicators complying with GB 1886.235 (Citric Acid) and GB 1886.25 (Sodium Citrate). All products have obtained Kosher, Halal and FDA certifications to meet food compliance standards at home and abroad.
1.1 Monohydrate Citric Acid (C₆H₈O₇·H₂O)
Its crystal contains one molecule of crystal water, with excellent water solubility and low caking risk under normal storage temperature. It delivers high cost performance and serves as the universal mainstream grade for food industry.
1.2 Anhydrous Citric Acid (C₆H₈O₇)
Free of crystal water, it owns stronger fluidity and extremely low hygroscopicity. It is suitable for high-temperature production, powdered solid drinks, effervescent tablets, pharmaceutical excipients and other high-end applications with longer shelf life.
1.3 Sodium Citrate (Trisodium Citrate Dihydrate, C₆H₅Na₃O₇·2H₂O, E331)
As the matched buffer salt of citric acid, it is weakly alkaline to neutralize acidity and stabilize system pH value. It has no pungent sour taste and outstanding buffering capacity, acting as a core stabilizer and chelating agent in food industry.
2. Application Scenarios by Industry
2.1 Beverage Industry (Largest Consumption Field)
Monohydrate citric acid is preferred for carbonated drinks, fruit juices and fruit-flavored beverages to adjust sour-sweet taste and inhibit microbial growth. Anhydrous citric acid is mandatory for instant powder drinks and effervescent tablets to avoid caking caused by moisture absorption. Sodium citrate is matched for functional drinks and dairy beverages to balance sourness and sweetness and prevent stratification & precipitation.
2.2 Confectionery, Jam & Canned Fruits
Monohydrate citric acid is used in jelly, hard candy and canned fruits to lower pH value, extend shelf life and prevent flesh oxidation & discoloration. Sodium citrate is applied in filled candies and jams to stabilize pulp texture and avoid water separation and stratification during high-temperature boiling.
2.3 Dairy & Baking Industry
A small amount of citric acid is added to yogurt and fermented milk to stabilize acidity, while baking pastries use it to balance sweetness and enrich flavor. Sodium citrate emulsifies and thickens cheese and cream products to deliver smoother texture and prolong fresh-keeping period of dairy goods.
2.4 Pharmaceutical & Daily Chemical Excipients
Anhydrous citric acid is a special raw material for effervescent tablets, oral liquids and skincare products, with mild pH value and zero impurity odor. Sodium citrate is used in medical buffer solutions and washing products to soften water, chelate metal ions in water and improve stability of toiletries.
2.5 Meat Processing
Sodium citrate acts as special water-retaining and color-protecting agent for meat products. It locks moisture of meat and inhibits myoglobin oxidation & blackening, widely used in ham, luncheon meat and quick-frozen prepared meat.
3. Raw Material Selection Suggestions
3.1 Large-scale beverage, canned food and general food manufacturers: Prioritize food-grade monohydrate citric acid for lower cost and stable supply.
3.2 Powdered formulations, effervescent products, pharmaceuticals and high-end baking brands: Choose anhydrous citric acid to guarantee stable production and prevent long-term storage caking.
3.3 Manufacturers of beverages, dairy products, meat products and daily chemicals: Purchase sodium citrate as supporting raw material for pH buffering, emulsification, color protection and water softening.
3.4 Purchase Reminder: Industrial-grade citric acid and sodium citrate exceed heavy metal limits and are strictly prohibited for food production. Always verify manufacturers’ food production licenses and quality inspection reports before purchasing.
Rizhao Huikun Trading supplies food-grade monohydrate citric acid, anhydrous citric acid and sodium citrate from Yinxuan, TTCA and Jinhe with spot stock. 25kg standard bags and bulk ton bags are both available. We provide original factory test reports and full sets of export customs clearance documents, supporting domestic food factories and global foreign trade export orders.