Basic Chemistry and Physicochemical Properties1. Chemical Information Basic Chemical Name: L-(+)-Lactic acid Systematic Name: (S)-2-hydroxypropanoic acidMolecular formula: \(\boldsymbol{\ce{CH3CHOHCOOH}}\) Molecular weight: 90.08CAS Number L-Lactic acid 79-33-4 Racemic DL-Lactic acid 50-21-5Jindan’s flagship product is the high optical purity L-lactic acid, the isomer that naturally occurs in the human body.2. Essential physicochemical properties (Standard conditions at 25°C)Appearance: Colorless, transparent, syrupy liquid. Color ≤ 5 APHA (high end grades), ≤ 10 APHA (standard grades).Odor: Mild acidic odor; no off-odors or pungent smells; highly hygroscopic, store in sealed containers to prevent moisture absorption.Optical Purity: ≥99.5% for common products; ≥99.8% for high-end polymerization/medical grades; up to 99.9% for premium medical implant grades.Acid Dissociation Constant pKa = 3.85 pH ≈ 2.4 (1% aqueous solution) Mildly acidic.Density: 1.206 g/cm3 Boiling Point: 122°C (15 mmHg) Heat-sensitive material, decomposes at high temperature.Solubility: Soluble in water, ethanol and glycerol, insoluble in weakly polar organic solvents (e.g. chloroform, diethyl ether).Thermal Stability : Dehydration and acrylic acid formation under system temperature above 110 °C. This is a critical control challenge in the purification process. Production Entity, Industry Status and Capacity Layout Manufacturer: 1.Henan Jindan Lactic Acid Technology Co., Ltd. (Jindan Technology, 300829.SH). It is the first listed company in China's lactic acid industry. The company is based in Dancheng, Henan, a major corn-producing region of the Huang-Huai-Hai Plain, where the company enjoys stronger supply chain and cost advantages from local sourcing of raw materials. Corporate Platforms The company has established a National Engineering Research Center for Lactic Acid, a postdoctoral research station and a laboratory accredited by the China National Accreditation Service for Conformity Assessment (CNAS), and has independent R&D capabilities spanning the whole value chain from strain development, fermentation, purification to downstream lactide/polylactic acid (PLA) production. 2. Production Capacity and Industry Ranking: By 2026, the total production capacity of lactic acid and lactates will reach 233,000 tons/year, ranking first in Asia and second in the world; the capacity of high-purity L-lactic acid will reach 120,000 tons/year, accounting for more than 40% of the domestic market.Our products are exported to more than 90 countries and regions around the world, with overseas warehousing facilities in Europe and North America, demonstrating a wide international presence. Core Production System: Raw Materials → Fermentation → Purification (Public Processes + Proprietary "Hidden" Technologies). Jindan Lactic Acid’s fermentation route is 100% bio-based, using corn starch (in contrast to the chemical synthesis of DL-lactic acid). The process consists of four major modules: (a) pretreatment of raw materials; (b) fermentation; (c) separation and purification; (d) recycling of by-products. It involves important proprietary technologies that constitute a barrier to competition. 1. Raw Material Pretreatment Process Corn wet milling → Starch extraction → Enzymatic hydrolysis and saccharificationEnzyme System: The company employs a proprietary blended enzyme system (α-amylase, glucoamylase, pullulanase, protease, and trace cellulase) instead of a single amylase, the precise formulation of which is kept strictly confidential.Technical Results: The starch conversion rate is ≥98%, and the residual dextrin is basically 0. The total viscosity of the fermentation broth is 40% lower than the industry level, which greatly reduces the burden of subsequent filtration and separation. 2. Fermentation System (Key Competitive Strengths: Custom Strains + Dedicated Fermentation Equipment + Simultaneous Saccharification and Fermentation) (1) Core Strains (Highest barrier in the industry; strictly confidential): Publicly described as *Lactobacillus thermophilus*, but in reality, these are engineered strains developed through multiple mutagenesis techniques and gene editing:Breeding methods: UV mutagenesis, EMS mutagenesis and low-temperature plasma mutagenesis, knockout of acid-producing byproduct pathways, and enhancement of lactate dehydrogenase by plasmid;Performance parameters: Acid tolerance limit of pH 3.8 (compared to 4.2-4.5 for standard industry strains) and temperature tolerance up to 45°C (compared to 40-42°C for mainstream industry strains);Core advantages: Direct fermentation at low pH reduces the consumption of alkali and minimizes the introduced impurities. No need for intensive chilled-water cooling in summer production, reducing the consumption of cooling energy by 30%. Inhibition of D-lactic acid production at genetic level, leading to naturally high optical purity without the need for additional chiral resolution.Management protocols: core strains are stored in graded isolation, not shared externally, their genome sequences are not disclosed, and external sequencing is prohibited, which is the company's core "technological trump card".(2) Fermentation Equipment and Flow Field Design: The main equipment is 500 m³ large-scale specialized anaerobic fermentation tanks (customized engineering, not off-the-shelf units).Customized structure: internal draft tubes, multi-layer staggered baffles, air-lift internal circulation system with micro-bubble aeration.Operational parameters: Vertical temperature difference inside the tank ≤0.5°C (average of the industry 1.5-2°C); dissolved oxygen fluctuation ≤±2% (average of the industry ±10%); effectively inhibit the generation of secondary substances such as acetic acid and succinic acid. (3) Operating conditions of Simultaneous Saccharification and Fermentation (SSF) process: constant temperature of 42°C, system pH of 5.5–6.0 and anaerobic environment;Main parameters: acid concentration 180-200g/L, fermentation cycle 42-44h, total sugar to acid conversion rate more than 96%. Compared with domestic peers (acid concentration 120-150g/L, cycle 60h), the production efficiency is greatly improved.Process logic: Simultaneous starch saccharification and lactic acid fermentation are performed, glucose is immediately consumed by the microbial cells, avoiding the substrate inhibition and further improving the conversion efficiency and product purity. 3. Separation and purification process (publicly disclosed vs. actual full-scale process) Publicly marketed as the calcium salt method combined with molecular distillation, the actual process has been fully upgraded to a combined system of ceramic membrane microfiltration, electrodialysis, coupled resin adsorption, and three-stage molecular distillation—a key factor in meeting high-end product standards.Microfiltration: Complete removal of solid impurities, such as microbial cell, macromolecular proteins and polysaccharides, by microfiltration with a 0.1 μm ceramic membrane;Electrodialysis: Application of specific selective ion-exchange membranes for deep desalination, ash removal and decolorization with removal rate of TOC 92%;Coupled Resin Adsorption: Uses a proprietary cross-linked specialty resin to selectively adsorb lactic acid while allowing impurities to pass through; this results in an 85% reduction in organic solvent use compared to conventional extraction methods;Molecular distillation (final refining) High vacuum (0.05–0.15 Pa), low temperature (92–98°C) and material residence time <8 s; three-stage series distillation setup; exact temperature control prevents formation of acrylic acid by-products; high-purity final product.Confidential key curves: The curves corresponding to temperature, vacuum level and residence time are closely guarded trade secrets and the main reason competitors cannot replicate the high-end product quality. 4. Green Circular System (Cost down + Environmental Protection)Fermentation residue:processed into high-protein feed to be sold, generating additional income of 200-300 RMB per ton of lactic acid;Production wastewater: Biogas production through anaerobic fermentation for boiler power generation and energy supply;Cascaded utilization of thermal energy: The steam and waste heat are recovered in the whole process and the comprehensive energy consumption is reduced by 25% compared with the industry average;Total energy consumption indicators: Standard coal consumption is 0.92 tons per ton of lactic acid (industry average: 1.3-1.5 tons); Corn feedstock consumption is 1.32 tons per ton of lactic acid (industry average: 1.5-1.6 tons); Raw material utilization efficiency is 12% higher than the industry average. Product classification, quality standards and quality control system: Jindan classifies its products into four mainstream grades according to application scenarios, with strict testing standards and the distinction between standard specifications and stricter internal control parameters. 1. Mainstream Product Models & Positioning L-Lactic Acid Food GradeStandards: FCC, GB 1886.173, US GRAS certified;SPECIFICATIONS: Active Content 80%~88% Optical Purity ≥99%Applications: Beverages, meat products, baked goods, pickled products, snack foods, etc. L-Lactic Acid, Pharmaceutical GradeStandards: USP, EP (Pharmacopoeial standards)Specifications: Active content >=90% Optical purity >=99.5%Key requirements: Very low heavy metal content, tight limits on microbial counts;Uses: Disinfectants, pharmaceutical intermediates, general medical consumables L-Lactic Acid (for PLA) Polymer GradeMain specifications: purity ≥99.5%; optical purity ≥99.8%; moisture <0.1%;Positioning: Feedstock for polylactic acid (PLA) and lactide; aimed at the market for biodegradable materials. L-Lactic Acid, Medical Implant Grade (Specialty Grade, High Grade)Superior specifications: optical purity ≥99.9%, moisture <50 ppm, free acid <10 ppm; strict limits on heavy metals, endotoxins and microorganisms.Applications: Absorbed suture, bone screw, vascular stent, sustained-release drug microsphere and other implantable medical devices Series: LactateSodium lactate (60% solution/powder) Calcium lactate Potassium lactate etc. Used extensively in food and personal care products for moisture retention, nutritional supplementation and pH adjustment. 2. Internal Control Systems and Quality TestingRoutine testing: chiral HPLC for optical purity, GC for trace organic impurities, AAS/ICP-MS for heavy metals.High internal standards: Food-grade Pb <0.1 ppm, As <0.05 ppm; Jindan’s internal standards in all grades are Pb <0.02 ppm, As <0.01 ppm and Hg <0.001 ppm. The corn raw material source is controlled for heavy metals and thoroughly purified, avoiding the industry-wide bad practice of simply “diluting to meet the standard.”Microbiological control: Sterile controls for pharmaceutical, polymerization and implant grades. Total viable count <10 CFU/g. No pathogenic bacteria. Downstream extension: core lactide technology (the core of PLA industry chain) Lactide is an intermediate product in the polymerization of lactic acid to polylactic acid (PLA). Jindan has made a technological breakthrough in this step, breaking the overseas monopoly.Catalytic system: Abandon the mainstream overseas stannous octoate (heavy metal, residue) and adopt the metal free composite catalytic system of organic guanidines and chiral ligands.Technical advantages: The catalyst can be metabolized to human body and has no residual heavy metal, the catalytic activity is three times of stannous octoate, and the reaction temperature is decreased by 20°C, the racemization is inhibited during the process, and the chiral selectivity of lactide is ≥99.8%.Production Capacity: Can stably mass produce L-lactide with an optical purity of 99.9%; one of the few domestic raw material suppliers certified by overseas high-end medical PLA enterprises. VI. (r) Full Scenario Applications (Public Applications + Unpublicized Industry Clients) Comprehensive Overview 1. Food Industry (Key application sector, accounting for 50% of total demand)Acidity Regulation: Provides a smooth flavor profile with no aftertaste bitterness; Replaces citric acid in beverages, yogurt, confectionary and baked goods for more flavor complexity;Antimicrobial & Preservative: Lowers system pH below 5.0 and disrupts microbial cell membranes inhibiting *E. *coli, *Listeria* and *Salmonella*; increases shelf life of meat products by 50%; widely used for disinfection of livestock/poultry carcasses and preservation of cooked meat products;Water Retention & Quality Improvement Sodium/potassium lactate retains free water in food; reduces water activity. Improves elasticity and juiciness of meat products and may allow for reduced phosphate use.Low-Sodium Formulation: A portion of the table salt is replaced with potassium lactate to enable a 30% reduction in the sodium content to meet healthy eating trends;Industry Clients (Not Publicized) Acquired from the top domestic meat processors (e.g., Shuanghui, Jinluo) and international fast-food chains (e.g., McDonald’s, KFC); DL-lactic acid via chemical synthesis is not included. 2. Pharmaceuticals and Personal Care (High Value Added Sectors)Disinfection and Antisepsis: 2% lactic acid solution is used for the disinfection of skin, mucous membranes and medical instruments; it has a sterilisation rate of 99.9%, does not cause any irritation and does not lead to bacterial resistance.Pharmaceutical Intermediates Used in the synthesis of antibiotics like ciprofloxacin lactate and norfloxacin lactate, and as a carrier for sustained-release drugs.Medical Biomaterials: Polymerization-grade lactic acid is used to produce medical-grade PLA for such applications as absorbable sutures, bone screws, and vascular stents. These materials are biocompatible and fully biodegradable, and therefore, do not require surgical removal. In the domestic market, companies like Weigao, Mindray and Kanghui purchase 80% of their medical grade PLA raw materials from Jindan, which also supplies LG (South Korea) and various overseas high-end medical material manufacturers.Personal Care Applications: Lactates are Natural Moisturizing Factors (NMF) used in skin care products, tooth paste and mouth wash. For example, the "GALA" supramolecular anti-aging product line from Bloomage Biotech (a major Chinese personal care company), has its core lactic acid component from Jindan's high-purity L-lactic acid, which is safe for skin care because of its low endotoxin content and also improves the transdermal absorption rate of active ingredients.3. Biodegradable Materials (Fastest-Growing Sector): PLA is fabricated from polymerization-grade L-lactic acid, a substance possessing polypropylene-like strength. It is a major substitute for petroleum plastics and completely breaks down into carbon dioxide and water within 180 days in natural environments.Application Scenarios: Biodegradable agricultural mulch films, disposable food containers, food packaging, drinking straws, textile fibers, and 3D printing filaments. The PLA market is booming with an annual growth rate of over 20% and a long-term supply shortage of polymerization-grade L-lactic acid driven by global plastic restriction policies. 4. Chemicals, Leather and Textiles and Animal FeedElectroplating Industry: Green complexing agent for electroless nickel plating; gives dense coatings and stable plating rates; replacement for traditional cyanide based complexing agents.Leather/Textiles: Used as tanning neutralization agent and dye fixing agent; leather softening, fabric color fastness and fiber hydrophilicity.Feed Additives: Serves as an acidifier and antimicrobial agent; lowers the intestinal pH in animals, suppresses harmful bacteria and improves feed conversion rates by about 10%; serves as an alternative to antibiotic additives. Key Competitive Advantages and Technical BarriersConfiguration and Purity Barriers: The entire product line is made with natural L-lactic acid with an optical purity far above industry averages, eliminating the risks associated with D-lactic acid metabolism; provides better human and biological compatibility than chemically synthesized DL-lactic acid (a 50/50 mixture of L and D isomers).Fully Bio-Based Green process: The process is based on renewable corn feedstock with low energy consumption and low emissions, which meet the requirements for carbon neutrality. It has obtained major global certifications such as FDA, REACH and Chinese national standards.Strain and Process Barriers: The proprietary closed-loop technical system, consisting of custom-engineered microbial strains, specialized fermenters, and multi-stage coupled purification processes, creates barriers that are difficult for competitors to copy.Cost and Scale Barriers Extensive manufacturing capacity, coupled with local sourcing of raw materials and recycling of waste heat/by-products, lead to overall production costs 30% below imported products.Complete Industry Chain Barriers: Realizes the full layout for the integrated "Lactic Acid --> Lactide --> PLA", with self-sufficiency of high-end raw materials, well positioned to meet the surging demand for downstream biodegradable materials and high-end medical materials. VIII. 8. Market Status and Industry Irregularities (Industry Insights)Mislabeling DL-Lactic Acid as L-Lactic Acid Many small companies use chemically made DL-lactic acid (which costs 40% less than L-lactic acid) and incorrectly label it as food grade or pharmaceutical grade L-lactic acid. The human body does not metabolize DL-lactic acid well and long-term buildup can result in metabolic acidosis, nerve damage and be dangerous to pregnant women and infants.Driving the Industry Standard Jindan has taken a pure L-lactic acid route and actively promoted the national standard of mandatory optical purity testing, eliminating the production capacity of substandard DL-lactic acid.Problems with Falsified Metrics: Some manufacturers use dilution to temporarily bring indicators such as heavy metal content and acidity into compliance. But Jindan employs dual controls on the raw materials and the production process to ensure inherent standards and improved batch-to-batch consistency. Industry Trends and Strategic SignificanceDemand for Biodegradable Materials Drives Growth: Global restrictions on plastics are boosting demand for PLA, creating a pressing need for high-purity, polymerization-grade L-lactic acid. As a major domestic player, Jindan is well positioned to capitalize.
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