What is Glucono Delta-Lactone (GDL) Used For?
Glucono delta-lactone (GDL, CAS 90-80-2) is the cyclic ester of gluconic acid — a naturally occurring, water-soluble white crystalline powder with a mildly sweet taste that slowly hydrolyzes to gluconic acid in aqueous environments. This controlled acidification mechanism makes GDL an exceptionally versatile food acidulant, coagulant, and leavening agent. Unlike mineral acids that act instantaneously, GDL releases acidity gradually and predictably, giving food manufacturers precise control over pH change rates in processing — a functionality that has made it indispensable across tofu production, baked goods, processed meats, dairy, and beverages.
WIS Biotech has manufactured food-grade GDL since 2015 at its Shandong, China production facility. Our 10,000 m² complex operates at 60,000 MT/year combined output across all gluconate and gluconate-derived products. Vertically integrated from glucose fermentation through to finished GDL crystallization, we supply food manufacturers, tofu producers, bakery ingredient formulators, and meat processing companies in more than 80 countries, with a 90% export ratio and direct-manufacturer efficiency built into every order.
Key Applications
Tofu and Soy Protein Coagulation
GDL is the coagulant of choice for premium silken tofu production, where its slow, uniform acidification yields a smooth, fine-curd structure that cannot be replicated with rapid-acting mineral coagulants such as calcium sulfate or magnesium chloride. When dispersed in hot soy milk, GDL hydrolyzes to gluconic acid over 20–40 minutes, gradually lowering the pH and triggering soy protein network formation in a controlled, even manner — producing the custard-like texture characteristic of high-quality silken tofu. WIS Biotech’s food-grade GDL is used by tofu manufacturers across East and Southeast Asia, as well as Western natural foods companies producing silken and soft tofu for retail and foodservice channels.
Baked Goods and Chemical Leavening
In baked goods, GDL functions as a slow-acting acidulant component of chemical leavening systems, where it reacts with sodium bicarbonate to release CO₂ during baking rather than during mixing. This delayed-action property is essential for products requiring extended batter hold times between mixing and baking — including pancake mixes, muffins, self-raising flour systems, and refrigerated dough products. Compared to fast-acting acids like cream of tartar, GDL’s slower hydrolysis rate gives bakers greater process flexibility and reduces premature gas loss that degrades finished product volume and texture. WIS Biotech’s GDL is used in bakery premix systems by commercial bakers and ingredient formulators across Asia, the Middle East, and Europe.
Processed Meats and pH Control
In processed meat manufacturing, GDL is used to control pH in fermented sausages, frankfurters, and salami-type products, where a controlled pH drop accelerates protein gelation, improves slice cohesion, and contributes to the characteristic tangy note of fermented meat products. Unlike lactic acid bacterial fermentation — which depends on microbial activity and temperature — GDL acidification is rapid, reliable, and not subject to biological variation, making it the preferred acidulant in high-throughput industrial sausage manufacturing. WIS Biotech supplies food-grade GDL to meat ingredient distributors and processed meat manufacturers in Europe, the Americas, and Asia.
Dairy and Fresh Cheese Acidification
In dairy processing, GDL is used to produce fresh cheese (quark, ricotta, cream cheese-style products) through direct acidification of milk, offering an alternative to starter culture fermentation that eliminates the time and variability of biological cultures. GDL’s controlled, gradual acidification rate produces a uniform curd with consistent yield and moisture content, critical for dairy manufacturers seeking standardized output from fresh cheese production lines. It is also used in non-dairy milk alternative products — such as soy, oat, and nut milks — for pH adjustment and protein coagulation in plant-based cheese applications.
Product Specifications
| Parameter | Specification |
|---|---|
| CAS Number | 90-80-2 |
| Molecular Formula | C6H10O6 |
| Molecular Weight | 178.14 g/mol |
| Assay | 99.0% min |
| Appearance | White crystalline powder, slightly sweet taste |
| Solubility | Freely soluble in water; slowly hydrolyzes to gluconic acid |
| pH (1% solution, 25°C, 1 hr) | 3.5 – 4.5 |
| Loss on Drying | 0.5% max |
| Heavy Metals (as Pb) | 20 ppm max |
| Arsenic (As) | 3 ppm max |
| Lead (Pb) | 2 ppm max |
| Reducing Sugars | 1.0% max (as glucose) |
| Available Grade | Food Grade (FCC/JECFA/E575) |
Packaging & Supply
GDL (glucono delta-lactone) is available in 25 kg net multi-layer kraft paper bags with inner PE liner, or 500 kg / 1,000 kg FIBCs (ton bags). Nitrogen-flush packaging available on request. Storage: below 30°C, dry and well-ventilated, away from direct sunlight and moisture.
MOQ: 500 kg. Standard 20-foot FCL at 10–18 MT. Terms: FOB Qingdao (standard); CIF, CFR, DDP available for established accounts. Lead time: 7–14 business days from order confirmation. Samples (1–5 kg) dispatched by DHL/FedEx within 3–5 business days.
Quality & Compliance
WIS Biotech’s GDL production is covered under the following active certification programs:
- ISO 9001:2015 – Quality Management System covering procurement, in-process control, and final QC release
- FSSC 22000 – Food Safety System Certification (GFSI-recognized); governs food-grade production lines
- Halal – IFANCA – Islamic Food and Nutrition Council of America; valid for export to Muslim-majority markets globally
- Kosher – OU – Orthodox Union; required for US specialty retail and export to Israel
- FAMI-QS – Feed Additive and Premixture Quality System (feed-grade lines only)
WIS Biotech does not produce pharmaceutical-grade (USP/BP/EP) material. Products are intended for food, feed, and industrial use. Every shipment includes CoA, SDS, and origin documentation. Health Certificates, Fumigation Certificates, and ASEAN Form E available on request.
Frequently Asked Questions
What makes GDL different from other food acidulants like citric acid or lactic acid?
GDL’s defining characteristic is its controlled, time-dependent acidification: it hydrolyzes slowly to gluconic acid in water, releasing acidity gradually over minutes to hours rather than instantaneously. Citric and lactic acids act immediately upon dissolution. This slow-release behavior is precisely what makes GDL irreplaceable in tofu coagulation, processed meat pH control, and slow-leavening bakery systems — applications where controlled pH change rate is as important as the final pH endpoint.
How is GDL used in tofu production compared to other coagulants?
GDL is the standard coagulant for silken (kinugoshi) tofu, where it produces a uniquely smooth, custard-like texture. Calcium sulfate and magnesium chloride coagulate soy protein rapidly, producing firmer curds suitable for firm and extra-firm tofu. GDL’s slow acidification creates a fine, uniform protein network throughout the mass — the defining characteristic of premium silken tofu. See our detailed guide: GDL in Tofu Production: A Manufacturer’s Guide.
What is the recommended dosage of GDL in tofu production?
Typical GDL dosage in silken tofu production is 0.2%–0.3% (w/w) of the soy milk weight, dissolved in a small amount of cold water and blended into soy milk before filling and coagulation at 80–90°C. Exact dosage depends on soy milk protein concentration, desired firmness, and processing equipment. WIS Biotech’s technical team can provide application-specific dosage guidance and trial data for new users on request.
What is the MOQ and lead time for GDL?
MOQ is 500 kg. In-stock orders typically ship within 7–14 business days FOB Qingdao. Sample quantities (1–5 kg) for application trials and product qualification are dispatched by international courier within 3–5 business days. GDL has a shorter shelf life than mineral gluconate salts (typically 12–18 months); storage recommendations and shelf-life data are included with every shipment.
Is WIS Biotech’s GDL approved as EU food additive E575?
Yes. GDL is approved as food additive E575 (glucono delta-lactone) under EU Regulation (EC) No 1333/2008, with quantum satis (QS) permission across most food categories. Our food-grade GDL meets EU purity criteria for E575 and is supplied with CoA, SDS, and origin documentation supporting EU customs clearance and food manufacturing compliance requirements.
Can GDL be used in non-dairy and plant-based food applications?
Yes. GDL is increasingly used in plant-based cheese analogues, oat milk, and soy-based dairy alternatives for protein coagulation and pH adjustment — the same mechanisms that make it effective in traditional dairy processing apply in plant-based matrices. WIS Biotech supplies GDL to plant-based food manufacturers across Europe and North America developing clean-label, cultured-alternative products without live bacterial cultures.
Related Resources
- GDL in Tofu Production: A Manufacturer’s Step-by-Step Guide
- Sourcing Gluconate from China: A Buyer’s Checklist
GDL is a key intermediate in gluconic acid chemistry. For industrial gluconate supply including concrete retarder-grade sodium gluconate, visit our group company Definly Chemicals.
Related Products
Customers ordering GDL from WIS Biotech also frequently source Gluconic Acid and Sodium Gluconate for related food processing and industrial applications.
About WIS Biotech
WIS Biotech is a dedicated gluconate ingredient manufacturer founded in 2015, headquartered in Shandong Province, China. Our 10,000 m² production facility delivers a combined annual output of 60,000 MT across eight mineral gluconate and specialty ingredient products. With a 90% export ratio and active customer relationships in over 80 countries, WIS Biotech is one of China’s leading direct-manufacturer gluconate suppliers. We are part of a group that includes Definly Chemicals, our export trading and construction chemicals affiliate. Learn more about our group structure.