L Cysteine Cas No 52 90 4 Suppliers and Manufacturers

Important Note: We can also do OEM/ Private Labeling Port of Loading: Semarang, Indonesia Baby Diapers FLUFFY Tape (Velcro) Type. Available Variants: 1. FTS10 (S Size. 1 Box = 10 Bag x 30 Pcs) 2. FTS 20 (S Size. 1 Box = 20 Bag x 15 Pcs) 3. FTS 40 (S Size. 1 Box = 40 Bag x 6 Pcs) 4. FTM 9 (M Size. 1 Box = 9 Bag x 30 Pcs) 5. FTM 18 (M Size. 1 Box = 18 Bag x 15 Pcs) 6. FTM 36 (M Size. 1 Box = 36 Bag x 6 Pcs) 7. FTL 8 (L Size. 1 Box = 8 Bag x 30 Pcs) 8. FTL 32 (L Size. 1 Box = 32 Bag x 6 Pcs) 8. FTX 7 (XL Size. 1 Box = 7 Bag x 30 Pcs) 9. FTX 14 (XL Size. 1 Box = 14 Bag x 16 Pcs) Baby Diapers FLUFFY Pants Type. Available Variants: 1. FPS 20 (S Size. 1 Box = 20 Bag x 12 Pcs) 2. FPM 8 (M Size. 1 Box = 8 Bag x 24 Pcs) 3. FPM 18 (M Size. 1 Box = 18 Bag x 12 Pcs) 4. FPM 34 (M Size. 1 Box = 34 Bag x 6 Pcs) 5. FPL 7 (M Size. 1 Box = 7 Bag x 24 Pcs) 6. FPL 18 (L Size. 1 Box = 18 Bag x 12 Pcs) 7. FPL 30 (L Size. 1 Box = 30 Bag x 6 Pcs) 8. FPX 16 (L Size. 1 Box = 16 Bag x 12 Pcs) 9. FPX 26 (L Size. 1 Box = 26 Bag x 8 Pcs)

important Note: We can also do OEM/ Private Labeling Port of Loading: Semarang, Indonesia Baby Diapers Mamamia Tape (Velcro) Type. Available Variants: 1. MTS10 (S Size. 1 Box = 10 Bag x 24 Pcs) 2. MTS 20 (S Size. 1 Box = 20 Bag x 12 Pcs) 3. MTM 10 (M Size. 1 Box = 10 Bag x 24 Pcs) 4. MTM 20 (M Size. 1 Box = 20 Bag x 12 Pcs) 5. MTM 40 (M Size. 1 Box = 40 Bag x 6 Pcs) 6. MTL 10 (L Size. 1 Box = 10 Bag x 24 Pcs) 7. MTL 20 (S Size. 1 Box = 20 Bag x 12 Pcs) 8. MTL 36 (S Size. 1 Box = 36 Bag x 6 Pcs) 9. MTX 10 (XL Size. 1 Box = 10 Bag x 24 Pcs) 10. MTX 20 (XL Size. 1 Box = 20 Bag x 12 Pcs) Baby Diapers Mamamia Pants Type. Available Variants: 1. MPS20 (S Size. 1 Box = 20 Bag x 12 Pcs) 2. MPM9 (M Size. 1 Box = 9 Bag x 16 Pcs) 3. MPM 20 (M Size. 1 Box = 20 Bag x 12 Pcs) 4. MPM 34 (M Size. 1 Box = 34 Bag x 6 Pcs) 5. MPM 60 (M Size. 1 Box = 60 Bag x 4 Pcs) 6. MPL 8 (L Size. 1 Box = 8 Bag x 16 Pcs) 7. MPL 20 (L Size. 1 Box = 20 Bag x 12 Pcs) 8. MPL 30 (L Size. 1 Box = 30 Bag x 6 Pcs) 9. MPL 54 (L Size. 1 Box = 54 Bag x 4 Pcs) 10. MPX 18 (XL Size. 1 Box = 18 Bag x 12 Pcs) 11. MPX 26 (XL Size. 1 Box = 26 Bag x 8 Pcs)

Name: 2-hydroxy-6-naphthoic acid Alias: 2,6 acid; 2-naphthol-6-carboxylic acid; 6-hydroxy-2-naphthoic acid; 6-hydroxy-2-naphthoic acid CAS NOï¼?16712-64-4 Molecular formula: c11h7o3 Molecular weight: 187.172 Product quality standard: Appearance characte Light yellow powder Content 99% 2-naphtholâ?¤0.10% 2,3-acidâ?¤0.10% melting point243-245�°C Loss on dryingâ?¤0.30% heavy metalâ?¤20ppm Application: used in medicine, liquid crystal, paint, etc. Packing: 25kg / cardboard barrel, or according to customer requirements

[Technical Indicators] 1. Industrial grade Indicator Name/Indicator Value Powdered Products (F) Needle Products (Z) Level 92 Level 93 Level 95 Level 92 Level 95 Appearance White or light yellow powder, without caking White or yellowish needle-like, without lumps Active matter,% 92.0 93.0 95.0 92.0 95.0 Free oil,% 1.2 1.2 1.2 2.0 1.5 Inorganic salt,% Sodium sulfate 5.8 4.8 2.5 4.8 2.5 Sodium chloride 0.15 0.15 0.15 0.15 0.15 Moisture,% 2.0 2.0 2.0 4.0 3.0 PH value (1% aqueous solution) 7.5-9.5 7.5-10 Whiteness (WB), 90 2. Toothpaste grade Indicator Name/Indicator Value Toothpaste Grade (Y) (I) Level (II) Level (III) Level Appearance White or yellowish powdery or needle-like, without caking Active matter,% 95.0 93.0 93.0 Free oil,% 1.2 1.2 1.2 Inorganic salt,% Sodium sulfate 2.5 3.2 4.0 Sodium chloride 0.15 0.15 0.15 Moisture,% 2.0 2.0 3.0 PH value (1% aqueous solution) 8-9.3 8-9.3 8-10 Whiteness (WB), 90 Foaming capacity/mm 180 Heavy metal (as Pb)/ (mg/Kg), 15 Arsenic content (as As)/ (mg/Kg), 3 Total bacterial count/ (CFU/G), 100 Total number of molds and yeasts/ (CFU/G), 100 Fecal coliforms/G Not to be detected Pseudomonas aeruginosa/G Not to be detected Staphylococcus aureus/G Not to be detected   3. Latex grade Indicator Name/Indicator Value Latex grade (powder, needle, liquid) Aggregate grade Seed level Liquid K12 Appearance White or yellowish powdery or needle-like, without caking Light yellow transparent liquid Active matter,% 94.0 92 28.5-30.5 Free oil,% 0.8-1.0 1.5-2.0 1.5 Inorganic salt,% Sodium sulfate 3.0 3.0 1.5 Sodium chloride 0.15 0.15 0.05 Moisture,% 3.5 3.5 - PH value (1% aqueous solution) 8-10 7.5-9.5 Whiteness (WB), 90 - Color Klett (30% active), - 60 4. Reagent grade Indicator Name/Indicator Value Reagent grade Level 99% Level 97% Appearance White flaky crystals White powder Solubility (1%, alcohol) Completely dissolved Solubility (10%, aqueous solution) Completely dissolved Chroma APHA (20%, deionized water), 15   - Active matter (%), â?¥ 99 (on dry basis) 97 Petroleum ether soluble matter (%), 0.2 1.0 Sodium sulfate (%), 0.5 1.5 Sodium chloride (%), Moisture (%), 1.0 2.0 PH value (1% aqueous solution) 6.0-8.0 6.0-11 Phosphate, 1ppm - Lead (Pb), 2ppm Iron (Fe), 1ppm Nitrogen, 5ppm - Arsenic (As), 0.1ppm Fraction content (%), 99.0 Absorbance (3%, deionized water) 230nm 0.4 260nm 0.1 280nm 0.1 - 410nm 0.01

4-Hydroxybenzoic acid Chemical Name:4-Hydroxybenzoic acid Trade Name:p-oxybenzoic acid Molecular Formula:C7H6O3 Molecular Weight:138.12 CAS No.:99-96-7 Properties:white odorless crystalline powder, easily soluble in hot water and alcohols, aethers and acetone, slightly soluble in cold water and benzene, insoluble in carbon bisulfide; relative density is 1.46 Use: Can be used as antiseptic, intermediate of dyes, pharmaceuticals; as main material of liquid crystal polymers; as material of pesticide intermediate Specification Item Specification Polymer Grade Technical Grade Appearance white crystal powder white crystal powder Purity(on dry base) % 99.6 99.0 Melting Point 214-217 212-216 Odor odorless odorless Solubility Clear and transparent clear and transparent Loss on Drying % 0.20 0.50 Color(Pt-Co) 10 40 Ash % 0.02 0.15 Sulfate(SO42-) 0.01 0.05 Chloride(Cl-) % 0.005 0.02 Phe% 0.01 0.10 Salicylic Acid % 0.02 0.10 4-Hydroxyisophthalic Acid(HIPA) ppm 500 / Insolubles in Metha ppm 50 / Potassium(K+) ppm 5 / Sodium (Na+) ppm 5 / Iron (Fe) ppm 5 / Ca2++Mg2+ppm 5 /

Monocalcium Phosphate (MCP) Feed grade Product Features The purity of the product, calcium and phosphorus ratio appropriate to ensure a higher degree of its biological effects. Phosphorus content greater than 22% of the products, their biological effects better. This unique high-tech companies use technology to make our products crystallization, high purity and its harmful impurities significantly below standards:HG28611997 Drying process advanced products, products with low free water under the premise that the product does not lose crystallization of water, avoid the product in the drying process for the loss of water caused by crystallization of biological effects of the reduction. Specifications Appearance white powder or granule Total P 22%min Ca 13-18% F 0.18% max As 10 ppm max Pb 10ppm max Moisture 4%max Source of OriginRock Packing and Storage Knitted bags lined polyethylene plastic bags double packaging, Weighing 25Kg. Transportation-and harsh rain. Stored in a cool, ventilated, dry place

2-Naphthol Basic information Chemical Properties Application Preparation Product Name: 2-Naphthol Synonyms: c.i.37500;c.i.azoiccouplingcomponent1;c.i.developer5;Developer A;Developer AMS;Developer BN;developera;developerams CAS: 135-19-3 MF: C10H8O MW: 144.17 EINECS: 205-182-7 Product Categories: Fluorescent;Naphthalene;pigments;alcohol;MICROCIDIN;Color Former & Related Compounds;Developer;Functional Materials;Intermediates;Aromatic Compounds;Alphabetical;Bioactive Small Molecules;Biochemicals and Reagents;Building Blocks;C9 to C20+;Cell Biology;Chemical Synthesis;Fluorescent Indicators and Probes;Fluorescent Probes;Labels;N;Organic Building Blocks;Oxygen Compounds;Particles and Stains;pH Sensitive Probes and Indicators;Phenols;Dyestuff Intermediates;Aromatics Mol File: 135-19-3.mol 2-Naphthol Chemical Properties Melting point 120-122 C(lit.) Boiling point 285-286 C(lit.) density 1,28 g/cm3 vapor density 4.97 (vs air) vapor pressure 10 mm Hg ( 145.5 C) refractive index 1.5762 (estimate) Fp 153 C storage temp. Refrigerator solubility methanol: soluble1g/10 mL, clear, colorless to light yellow pka 9.51(at 25C) form Powder, Crystals or Granules color White PH Range Non& uorescence (8.5) to blue & uorescence (9.5) Water Solubility 1 g/L (20 C) �»max 226nm, 265nm, 275nm, 286nm, 320nm, 331nm Merck 14,6384 BRN 742134 Stability: Stable. Combustible. Dust may form explosive mixture with air. Incompatible with strong oxidizing agents, phenol. Major Application Display device, semiconductors, photoimaging materials, inks, toner, chalk, security paper, molding materials, tin plating method, rubber, adhesive, leather, detergent, hair dyes, antimitotic drug, anticancer agent, antiinflammatory agent, treatment of acne vulgaris (pimples) and other dermal ailments (rashes, scratches, blemishes, hair loss), disorders InChIKey JWAZRIHNYRIHIV-UHFFFAOYSA-N CAS DataBase Reference 135-19-3(CAS DataBase Reference) NIST Chemistry Reference 2-Naphthalenol(135-19-3) EPA Substance Registry System 2-Naphthalenol (135-19-3) Safety Information Hazard Codes Xn,N Risk Statements 20/22-50 Safety Statements 24/25-61 RIDADR UN 3077 9/PG 3 WGK Germany 2 RTECS QL2975000 F 8 Autoignition Temperature 430 C TSCA Yes HazardClass 9 PackingGroup III HS Code 29071590 Hazardous Substances Data 135-19-3(Hazardous Substances Data) Toxicity LD50 orally in Rabbit: 1960 mg/kg LD50 dermal Rabbit > 10000 mg/kg 2-Naphthol Usage And Synthesis 2-Naphthol Preparation Products And Raw materials

Commodity:Avobenzone CAS No. 70356-09-1 Molecular Formula C20H22O3 Molecular Weigh 310.39 EINEC No. 274-581-6 Specification Quality standard: USP36 Appearance Off-white powder Assay 95.0-105.0% Melting range 81.0~86.0 Impurities Any individual impurity: 3.0% The sum of all of the impurities: 4.5% Loss on drying 0.5% Packaging and storage: 1kg/aluminum foil bag. 25kg/barrel, pharmaceutical packaging barrel. Sealed, stored in dark, with a shelf life of 2 years. Reference dosage: The hygiene standards for cosmetics stipulate that the maximum amount added shall not exceed 5%, and the general dosage is 1-4%. Usage: Sunscreen agent-1789 is the most effective fat soluble UVA filter and is a safe and effective UVA sunscreen approved by the US FDA for sale on the counter. It can effectively block UVA, thereby increasing the SPF value of sunscreen products. It can improve the efficacy of sunscreen products when used in combination with UVB filters, and BL-200 has the best effect when used in combination with octyl methoxycinnamate. BL-200 can increase its stability in the product. It has an extremely effective protective and repairing effect on human skin. Application: This product is soluble in oil and can be formulated into a cream using the usual method. However, the product turns red when it encounters metal ions, so other components such as formula water should not introduce metal ions. The equipment should be made of pure stainless steel, and an appropriate amount of EDTA-2Na should be added to the formula water phase to chelate with metal ions.

[Alias] foaming powder; sodium lauryl sulfate; sodium lauryl sulfate; sodium dodecyl sulfate, sodium dodecyl sulfate [English name] Sodium dodecyl sulfate. [Abbreviation] SDS [CAS No.] 151-21-3 [Molecular formula] ROSO3Na R = C12alkyl, C12-C14alkyl [Molecular weight] 288.38 (R = C12alkyl), 296 (R = C12-C14alkyl) [Grade] It can be divided into industrial grade (GB/T15963-2008), toothpaste grade (QB/T2900-2012), latex grade and reagent grade according to application fields and standards. [Technical Indicators] [Performance and Applications] This product is a white or yellowish sticky substance, commonly used in detergents and textile industry. Belon to an anionic surfactant.It is easy to dissolve in water, has good compatibility with anions and nonions, and has good emulsification, foaming, penetration, decontamination and dispersion properties. It is widely used in toothpaste, shampoo, shampoo cream, shampoo, washing powder, liquid washing, cosmetics and plastic demoulding, lubrication, pharmaceutical, papermaking, building materials, chemical and other industries. (1) Used as detergent and textile auxiliaries, also used as toothpaste foaming agent, mine fire extinguishing agent, emulsion polymerization emulsifier, wool detergent, etc. (2) Used as anionic surfactant, emulsifier and foaming agent (Use 3) GB 2760-96 stipulates that it is a processing aid for food industry. Blowing agent; emulsifier; anionic surfactant. Used for cake, beverage, egg white, fresh fruit, fruit juice beverage, edible oil, etc. (4) It is used as an emulsifier for drugs, cosmetics and synthetic resins. Foaming agent for toothpaste and fire extinguisher. Used as a detergent for fine silk and wool fabrics. Flotation agent for metal beneficiation. (5) Used as detergent and textile auxiliaries, also used as toothpaste foaming agent, fire extinguishing foam liquid, emulsion polymerization emulsifier, pharmaceutical emulsion dispersant, shampoo and other cosmetics, wool detergent. (Use 6) Biochemical analysis, electrophoresis, ion pair reagent

Product Name: Ferrous Sulphate Heptahydrate Molecular Formula: FeSO4. 7H2O CAS No.: 7782-63-0 Mol Weight: 278.05 Usage and Dosage: 1. Industrially: ferrous sulphate heptahydrate is mainly used as a precursor to other iron compounds. It is a reducing agent, for the reduction of chromate in cement. 2. Nutritional Supplement: Together with other iron compounds, ferrous sulphate is used to fortify foods and treat iron-deficiency anemia. Constipation is a frequent and uncomfortable side effect associated with the administration of oral supplements. Stool softeners often are prescribed to prevent constipation. 3. Colorant: Ferrous sulphate can also be used to stain concete and some limestones and sandstones a yellowish rust color. 4. Water Treatment: Ferrous sulphate has been applied for the purification of water by flocculation and for phosphate removal in municipal and industrial sewage treatment plants to prevent eutrophication of surface water bodies. Storage: Storage Store in cool, dry, well ventilated area, removed from oxidising agents (eg. hypochlorites), acids, metals and foodstuffs. Ensure containers are adequately labelled, protected from physical damage and sealed when not in use. Large storage areas should have appropriate ventilation systems. Precaution: Flammability Non flammable. No fire or explosion hazard exists. Packing: Net weight 25kgs, 50kgs per each plastic woven bag Technical Specification Appearance: Light green crystalline powder Fe 19.7%min Pb 20 ppm max As2 ppm max Cd 5 ppm max Size Crystalline Powder

Commodity: Sodium Metabisulphite Molecular formula:Na2S2O5 Molecule Weight:190.10 H.S code:28321000 CAS:7681-57-4 Product Features Appearance : White Or Light Yellow Crystal Powder Odour: Sulfur Dioxide Taste : Salty Melting Poing : 150 Specific Density1.48 Ph : 4.0-4.6 Solubility : Soluble In Water ,insoluble In Alcohol Application: 1. For industry Mordant of printing and dyeing; Dechlorinate of textile after bleaching; Sulphonated agent and reducer of chemical industry and pharmacy; Bleach of paper pulp, bamboo and timber bleach of stapk; Treatment agent of waste water; Rubber solidifying agent ;Perfume industry is served as hydrocarbon perfume aldehyde ; The hide profession employ to do to molt dose and pliable dose and wearproof dose ,The sensitize industry is served as the developing agent reductant and the protection of fixing bath dose and so on; sewage treatment. 2.For food additive Bleach agent (e.g.candies, cake, bamboo shoots, etc);Loose agent (e.g.bread, cracker etc);Antiseptic and germicide (e.g.fruit juice, tinned foodbrews, the cereals food is defended storage etc);Inhibitor and freshen agent (e.g.day lily, seafood, fruit and vegetable etc) Specifications: Na2S2O5 97% min SO2 65% min Fe 0.0015% max water-Insoluble 0.01% max As 0.0001% max PH 4.0-4.6 Packing and Storage Knitted bags lined polyethylene plastic bags double packaging, Weighing 25Kg/50KG/1000Kg/1200kg. Transportation-and harsh rain. Stored in a cool, ventilated, dry place.

Ferrous Lactate, E585, CAS no.5905-52-2, is a ferrous salt of lactic acid manufactured process through neutralizing lactic acid. Ferrous Lactate is widely used as acidity regulator in food, beverage, dairy product, powder drinks, baby food and bakery. As an experienced Ferrous Lactate manufacturer and supplier, we has been supplying and exporting Ferrous Lactate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Categories Preservatives Qty in 20 FCL 20000kg Min Order 1000kg Origin China Packaging Factory Packaging or Neutral Certificate ISO, Kosher, Halal, BRC E No. E585 CAS No. 5905-52-2 HS Code 291811 Specification FCC/USP Ferrous Lactate Food grade Specification Ferrous lactate 96% .Min Loss on drying 20% .Max Chloride(CI) 0.1% .Max Iron (Fe 3+ ) 0.6% .Max Sulphate(SO 4 ) 0.1% .Max PH 5-6 Lead 1 ppm.Max Arsenic 3 ppm.Max

BAMBOO BOWL Specification: Origin: Viet Nam Material: 100% Bamboo Color: Natural color, Wood color, Brown Size: 4 size: XS: D9xH5 S: D12xH5 M: D14xH7 L: D18xH8 Shape: Round, Cylinder, Oval Price: negotiated Function: storage, decoration, kitchenware, tableware Feature: Durable, various shape, premium quality, lightweight, transitional, eco-friendly, high endurance MOQ: 100 Pieces Packing: Carton Box, Customer's demand Technique: Print Logo Payment: L/C, T/T, Western Union, Xoom

We are manufacturer of psyllium husk Psyllium Husk Purity 85%, 90%, 95%, 98%, 99% Psyllium Powder 85%, 90%, 95%, 98%, 99% 40, 60, 80 Mesh Packing 25/50 kg and jumbo bag Additional Information: • Item Code: PSY01 • Pay Mode Terms: L/C (Letter of Credit),D/A,T/T (Bank Transfer),Other • Port of Dispatch: Mundra • Production Capacity: 150 Mt/Month • Delivery Time: 15 days • Packaging Details: 25/ 50 Kg

L-Carnitine L-Tartrate, CAS No.36687-82-8, white crystalline powder, manufacturing process via chemical synthesis from L-Carnitine and L-Tartaric Acid. L-Carnitine L-Tartrate is widely used as a weight-loss and fat-burning supplement in body building. Such as in health products, sports beverages, and infant foods. As an experienced L-Carnitine L-Tartrate manufacturer and supplier, we has been supplying and exporting L-Carnitine L-Tartrate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. L-Carnitine L-Tartrate Specification ITEM STANDARD Appearance White crystalline powder Specific rotation -9.5~11.0 Residue on Ignition % 0.5 Heavy Metals (ppm) 10 Arsenic(ppm) 1 Solubility Clarification PH(1%water solution 3.0-4.5 Water content % 0.5 L-Carnitine % 68.5 ±1.0 L-tartaric acid % 31.8 ±1.0 Assay % 98

L-Aspartic Acid, CAS No.56-84-8, is the L-isomer of Aspartic Acid, available as White crystalline powder. L-Aspartic Acid is an essential amino acid for building proteins. So itâ??s widely used as nutrition supplements. L-Aspartic acid is also an important material in manufacturing of aspartame. As L-Aspartic Acid Manufacturers, Suppliers and Wholesalers in China , we supply food and feed grade L-Aspartic Acid, also D-Aspartic Acid and DL Aspartic Acid. As an experienced L-Aspartic Acid manufacturer and supplier, we has been supplying and exporting L-Aspartic Acid for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. L-Aspartic Acid Food grade Specification DESCRIPTION White, oderless crystals or crystalline powder having a slightly acid taste. It is slightly soluble in water but insoluble in alcohol and in ether.It melts at about 270. Chemical Name L-Aminosuccinic Acid Molecular Formula C4H7NO4 Structural Formula Molecular Weight 133.10 SPECIFICATION (FCCVII) Identification Corresponds Assay(as C4H7NO4)è?½ 98.5% â?? 101.5%(Calculated on the dried basis) Heavy Metals(as Pb) 10mg/kg Max Lead 5mg/kg Max Loss On Drying 0.25% Max Residue on Ignition 0.1% Max Specific Rotation +24.5 ~+26.0(after drying) Arsenic(as As) 2mg/kg Max MAIN FUNCTION AND PURPOSE L-Aspartic acid can be added into cool drinks as nutrition supplement. It is used in medicine as ammoniac detoxicating agent, hepar function accelerator or fatigue refresher. And it can also be used in biochemical reagent, medium and intermediate in organic synthesis. PACKING 25KG net in Plastic Woven Bag lined with PE bag, 18MT/20FCL(on pallet) or 20MT/20FCL(without pallet). STORAGE Kept airtightly in a light-proof, dry and cool place.

L-Tryptophan powder, CAS No.73-22-3, essential amino acid manufactured by fermentation from carbohydrate sources, free of materials of animal origin. Uses: L-Tryptophan uses in food, protein powder, skin care cosmetics, drinks as supplement. L-tryptophan is used as an active ingredient in antidepressant therapy. Other uses of L-tryptophan include weight loss and reduction of PMS. Function: plays a key role in balancing sleep and mood patterns. As an experienced L-Tryptophan manufacturer and supplier, we has been supplying and exporting L-Tryptophan for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. L-Tryptophan Specification ITEMS STANDARDs Appearance White crystals or crystalline powder Assay 98% Min Specific Rotation -29.0~ -32.3 Loss on Drying 0.5% Max Heavy Metals 20mg/kg Max Arsenic(As2O3) 2mg/kg Max Residue on ignition 0.5% Max