DL-Menthol

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Flavors and fragrances First aid of poisoning Detection method Chemical properties Uses

Product Name: DL-Menthol
CAS No.: 89-78-1
Chemical Name: DL-Menthol
Synonyms: 89-78-1;Mentol;Racemic menthol;-MenthoL;I-menthol;Menthomenthol;p-Menthan-3-ol;component of Theragesic;DL - mint;DL-Menthol
CBNumber: CB7498497
Molecular Formula: C10H20O
Formula Weight: 156.27
MOL File: 89-78-1.mol

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DL-Menthol Property

Melting point:: 34-36 °C(lit.)
Boiling point:: 216 °C(lit.)
alpha: -2 º (c=10, EtOH)
Density: 0.89 g/mL at 25 °C(lit.)
vapor pressure: 0.8 mm Hg ( 20 °C)
refractive index: 1.4615
FEMA: 2665 | MENTHOL RACEMIC
Flash point:: 200 °F
storage temp.: Store below +30°C.
solubility: 456mg/l
form: Crystalline Solid
pka: 15.30±0.60(Predicted)
color: Colorless to white
Odor: at 10.00 % in dipropylene glycol. peppermint cool woody
Odor Type: mentholic
Water Solubility: insoluble
Merck: 14,5837
JECFA Number: 427
BRN: 3194263
LogP: 3.4 at 37℃
CAS DataBase Reference: 89-78-1(CAS DataBase Reference)
NIST Chemistry Reference: DL-Menthol(89-78-1)
EPA Substance Registry System: (1R,2S,5R)-Menthol (89-78-1)

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Safety

Hazard Codes: Xn,Xi
Risk Statements: 37/38-41-36/37/38
Safety Statements: 36/37/39-24/25-36-26-39
RIDADR: UN 1888 6.1/PG 3
WGK Germany: 2
RTECS: OT0350000
Autoignition Temperature: 405 °C
TSCA: Yes
HS Code: 29061100
Toxicity: LD50 orally in rats: 3180 mg/kg (Jenner)

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P337+P313IF eye irritation persists: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: W266507
Product name: DL-Menthol
Purity: ≥95%, FCC, FG
Packaging: 250g
Price: $97.3
Updated: 2024/03/01

Sigma-Aldrich

Product number: W266507
Product name: DL-Menthol
Purity: ≥95%, FCC, FG
Packaging: 1kg
Price: $145
Updated: 2024/03/01

Sigma-Aldrich

Product number: W266507
Product name: DL-Menthol
Purity: ≥95%, FCC, FG
Packaging: 4kg
Price: $424
Updated: 2024/03/01

Sigma-Aldrich

Product number: M2772
Product name: Menthol
Purity: 99%
Packaging: 5G
Price: $48.6
Updated: 2024/03/01

Sigma-Aldrich

Product number: M2772
Product name: Menthol
Purity: 99%
Packaging: 100g
Price: $71.6
Updated: 2024/03/01

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DL-Menthol Chemical Properties,Usage,Production

Flavors and fragrances

Menthol is a cyclic terpene alcohol flavors and fragrances with its appearance exhibiting colorless needle or shuttle columnar crystal or white crystalline powder. It has special aroma of mint with its taste being hot at first but then being cool later. It exhibit neutralizing reaction in the ethanol solution, being extremely easily soluble in ethanol, chloroform, petroleum ether, ether, liquid paraffin or volatile oil and being very slightly soluble in water.
Its molecular structure contains three asymmetric carbon atoms, so it has four stereoisomers with their aroma intensity and type and cool feeling being different. There are two common types: natural menthol and synthetic menthol. Natural menthol is a kind of saturated ring alcohol obtained through the freezing & crystallization, separation and refinement of peppermint oil with the optical rotation being L; synthetic menthol is made from taking lemon eucalyptus oil as raw material.
Its main component can be manufactured from the ring closing reaction of citronellal to obtain isopulegol, followed by hydrogenation, or through the synthesis of thymol from m-cresol with catalytic hydrogenation resulting in four menthol mixture of isomers with the precise vacuum distillation obtaining defined synthetic menthol, being racemate with no optical rotation. It has bactericidal and anti-corrosion effect and can be used as the fragrance of toothpaste, perfume, beverages and confectionery. In the medicine, it can be used for making cool oil, painkillers, mouthwash, and so on.
The main applications are as follows:
1. Menthol can act on the skin sensory nerve end, making the skin surface to produce cool feeling, achieving the purpose of itching prevention. Topical administration to the affected area can be used for the treatment of urticaria, prurigo, prickly heat, rash, neurodermatitis and skin pruritus and so on.
2. It can be used for the treatment of headache, nasal congestion and sore throat. This product has pleasant aroma and has curing effect on treating cold and wind heat. It has effects of refreshing the mind and clearing the throat.

First aid of poisoning

Topical application of menthol have effects of promoting blood circulation and anti-inflammatory, anti-itching and can be applied to anti-inflammatory, antipruritic, analgesic and reducing swelling and so on.
【Diagnosis】
1. Oral administration of large amount of menthol or inhaling of large amount of menthol gas can lead to gastrointestinal symptoms such as nausea, vomiting and abdominal pain as well as nervous system symptoms such as excitement, tremor, dizziness, vertigo, hand and foot numbness, swing gait, lethargy, breathing changes, facial flushing, reduced blood pressure, muscle rigidity or relaxation, occasional being not able to speak; children, after taking a large dose, can have coma. But it can be generally restored within a few hours.
2. Patients allergic to this chemical can get with eczema with unbearable itching feeling.
3. Small infants, sometimes due to nasal mint liquid or ointment, can get glottis spasm, accompanied with bruising and suffocation as well as secretion of large amounts of mucus. In severe cases, it may be occurred of respiratory and cardiac arrest.
【Treatment principles】
1. Gastric lavage; conduct catharsis with salt cathartic. Avoid using fats and oils.
2. Apply intravenous rehydration to promote excretion.
3. In cases of allergic symptoms, we should treat with antihistamines such as diphenhydramine, chlorpheniramine, etc.; if necessary, we can apply hydrocortisone or dexamethasone intravenously.

Detection method

(1) Chemical qualitative method
① take 1 g of this product, add 20 mL of sulfuric acid to dissolve it, so the reaction mixture becomes orange-red. After 24h, there will be colorless oil layer of non-menthol aroma precipitated out (the distinction from thymol).
② take 50 mg of this product, add 1mL of ice acetic acid to dissolve it; Addition of 6 drops of sulfuric acid and 1 drop of nitric acid to the cold mixture will lead to only slightly yellow color (the difference from thymol).
(2) thin-layer chromatography: take appropriate amount of menthol and dissolve in anhydrous ethanol, make a solution containing 6 mg menthol per mL for spotting. TLC: silica gel G manual plating, make it dry; have it subjected to activation in 105 °C for 1 hour and standby. Developing agent A: n-hexane-ethyl acetate-benzene (43: 4.5: 4); Developing agent B: petroleum-ether-ethyl acetate-chloroform (25: 2.5: 5.5). Coloration reagent: 5% vanillin ethanol solution-concentrated sulfuric acid (100: 6). Coloration: heating at 105 ℃ for 6~10min, exhibiting a circular blue spots.
(3) Determination of physical constants: melting point: 42 ℃~44 °C. Specific rotation: take this product for accurately weighing; add ethanol to make a solution of 0.1 g/mL. Measure according to the method, the specific rotation is-49 ° ~-50 °.
(4) non-volatile matter: take 2 g of this product and place it in the pre-weighed evaporating dish; have it heated in the water bath so it is slowly evaporated; dried at 105 ℃ to constant weight with the leftover residue not exceeding 1mg.

Chemical properties

L-form appears as colorless needle crystal. The melting point is 42-43 °C; the boiling point is 216 °C, the specific rotation:-51 °-45 °; the flash point: 93 °C; the relative density: 0.8810; it is soluble in ethanol and is miscible with oil. It has cool, fresh, pleasant mint characteristic aroma with sweet spiky gas. It gives people a cold feeling with aroma penetrating through the hair, but not lasting. The taste is also fresh sweet cool taste.

Uses

It is mainly used in medicine, toothpaste, toothpaste and mouthwash with its cool taste being able to enhance the smell of peppermint oil, having effect of refreshing the brain as well as disinfection effects. It can also be used as spices to be applied to the colognes. Application of appropriate amount of low-grade soap and detergent fragrance such as roses, geraniol, lavender and fragrant has effects of enhancing the tone and aroma. It can also be applied to food flavors and flavor for wine and tobacco.
In medicine, it can be applied to the cooling oil, painkillers, etc., it can also be used for making toothpaste, toothpowder, candy, beverages, spices and so on. How to use: it can be used for formulating the food flavor in the food flavor plant; or also be directly added or dissolved in alcohol to be added to the food flavoring. Storage requirements: placed in a cool place, sealed for storage. Avoid wind and rain.

Description

(±)-Menthol is a racemic mixture of the monoterpene alcohols (–)-menthol and (+)-menthol , which have been found in Cannabis. (–)-Menthol is more common than (+)-menthol in nature and exhibits analgesic, antibacterial, and anticancer properties, as well as inhibits cholinesterase. (+)-Menthol inhibits the growth of F. verticillioides (MIC = 1.5 mM) but, unlike (–)-menthol, does not exhibit analgesic, antibacterial, anticancer, or cholinesterase inhibitory activities.

Description

Menthol has a mint-like odor and a fresh, cooling taste. It may be prepared by hydrogenation of thymol.

Chemical Properties

Menthol has a peppermint-like odor and exerts a cooling sensation when applied to skin and mucosal surfaces. Menthol is a monocyclic terpene alcohol with three asymmetric carbon atoms in its cyclohexane ring resulting in (–) and (+) menthol, neomen thol, isomenthol and neoisomenthol. (–)-Menthol is the isomer that occurs most widely in nature and is the one commonly identified as menthol.

Chemical Properties

colorless to white crystalline solid

Physical properties

Appearance: colorless or white acicular prismatic crystals or white crystalline powder. Solubility: easily dissolved in ethanol, chloroform, ether, liquid paraffin, or volatile oil and soluble in water. Odor: a cool, refreshing, and pleasant mint aroma, sweet odor, and taste cool early after burning. Boiling point: 212?°C. Melting point: 41–43?°C. Specific optical rotation: ?49 to ?50°.

Occurrence

Reported found in peppermint and other mint oils (e.g., M. arvensis), lemon peel oil, cranberry, pineapple, cab bage, thymus, egg, rum, cocoa, tea, honey, avocado, coriander, mango, rice, litchi, dill herb, calamus, juniper berries, fennel, buchu oil, clam and Roman chamomile oil, Mentha species.

History

In the world of aromatic chemicals, menthol is often described as a unique source of skin and mucous membranes. Menthol is mainly extracted from natural plants. The vast majority of natural menthol in the global market is extracted from numerous Asian mint. In 2006, the world’s natural menthol production is 12,800?tons or more. However, due to various factors, the production of natural menthol is becoming less and less. Since the 1960s, Japan, Germany, and other countries had developed the synthetic menthol products. In 1974 the German company Symrise and Japan Takasago Fluidic Systems company launched chemical synthesis of menthol. At present, attention has been paid to the study of menthol analogy substances and the effect of the changes of molecular structure on the aroma and cool sensation. Some studies have shown that hydroxyl groups located in the branched or 1, 4 chain cannot show a sense of cool. The researchers believed that menthol analogy substances with optical activity should be able to show different, surprising cooling effect, and the structure of hydroxyl alkyl groups is the key point to have a cooling effect. The Japanese chemist Ryoji Noyo and his colleagues found that in BINAP and rhodium complexes as catalysts for asymmetric hydrogenation reaction, the synthesis of menthol is very effective. Because of the contribution of asymmetric organic synthesis, they won the 2001 Nobel Prize in Chemistry.

Uses

A chemical which triggers cold-sensitive TRPM8 receptors in the skin neurons in vitro.

Uses

In liqueurs, confectionery, perfumery, cigarettes, cough drops, and nasal inhalers.

Uses

DL-Menthol may be used as an extraction solvent for the determination of parabens in food products, cosmetics and pharmaceuticals using liquid-liquid microextraction with high performance liquid chromatography-diode array detection (HPLC-DAD). It may also be used for the preparation of hydrophobic deep eutectic solvent (DES) in the extraction and determination of methylparaben, propylparaben, and butylparaben from cosmetics samples using syringe-to-syringe dispersive magnetic nanofluid microextraction procedure (SS-DMNF-ME) with high-performance liquid chromatography technique (HPLC).

Definition

ChEBI: P-menthan-3-ol is any secondary alcohol that is one of the eight possible diastereoisomers of 5-methyl-2-(propan-2-yl)cyclohexan-1-ol. It has a role as a volatile oil component. It is a p-menthane monoterpenoid and a secondary alcohol.

Preparation

By hydrogenation of thymol.

Indications

For external application, it is applied locally and often used to relieve pain and itching. A nasal drip is used in the head cold. Inhalation or spray is used for sore throat. Oral administration can promote digestion.

Aroma threshold values

Detection: 950 ppb to 2.5 ppm; aroma characteristics at 1.0%: cooling menthol with a penetrating minty eucalyptus note.

Taste threshold values

Taste characteristics at 25 ppm: cooling, camphoreous, minty with a clean eucalyptus note.

General Description

White crystalline solid with a peppermint odor and taste.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

DL-Menthol is incompatible with butyl chloral hydrate, camphor, phenol, chloral hydrate, Exalgine, betanaphthol, resorcinol or thymol in triturations; potassium permanganate, chromium trioxide and pyrogallol. DL-Menthol is also incompatible with strong oxidizers.

Hazard

Irritant to mucous membranes on inhalation.

Fire Hazard

DL-Menthol is combustible.

Flammability and Explosibility

Not classified

Biochem/physiol Actions

Menthol exhibits antifungal action on the membrane permeability and the cell wall consistency, this might leads to cell death or inhibition of the C. albicans filamentation. Therefore, it can be used as a potential therapeutic agent for candidiasis. In addition to antifungal activity, menthol also exhibits anesthetic, antispasmodic, anti-ulcer and antiviral properties. It is considered as a safe compound for animal life. Therefore, Menthol is widely used in pharmaceuticals, cosmetics and food industries.

Pharmacology

Menthol has a wide range of pharmacological effects. Menthol can stimulate the nerve endings of skin and slowly penetrate into the skin, resulting in prolonged congestion and reflex caused by deep vascular changes, adjusting the vascular function, and achieving therapeutic effects in topical application. Topical application of compound has anti-inflammatory, analgesic, and anesthetic effects.
In respiratory system: For treatment of bronchitis, it could reduce the respiratory tract foam sputum and increase the effective ventilation cavity road. For treatment of rhinitis and laryngitis, it exerts mitigation by promoting secretion and diluting viscous mucus.
In digestive system: Menthol showed the powerful effect on bile.
In central nervous system: A small amount of peppermint can stimulate the central nervous system through the peripheral nerve to expand the skin capillaries, promote the secretion of sweat glands, increase heat dissipation, and show sweating antipyretic effect.
In addition, menthol has penetration-enhancing effect on many kinds of drugs; the mechanism is related to the changes of the ultrastructure of the skin, which is expected to be widely used in transdermal drug delivery agents. In vitro experiments, it had strong antibacterial activity against Staphylococcus aureus and Bacillus proteus. Recently, British scientists found that mint leaves can prevent cancer lesions in the blood vessel growth to decrease blood supply for, showing a certain anti-tumor effect

Clinical Use

It can be clinically used to assist anesthesia, postoperative analgesia, intercostal nerve block, trigeminal nerve block, occipital nerve block, and so on. When applied locally, it can promote blood circulation, diminish inflammation, relieve itching, relieve pain, relieve edema, and so on.

Safety Profile

Poison by intravenous route. Moderately toxic by ingestion and intraperitoneal routes. A severe eye irritant. Incompatible with phenol, p-naphthol, resorcinol or thymol in trituration, potassium permanganate, chromium trioxide, pyrogallol. Combustible liquid. \When heated to decomposition it emits acrid smoke and irritating fumes.

DL-Menthol Preparation Products And Raw materials

Raw materials

Peppermint oil

Preparation Products

rhodinyl formate Rhodinol L-Menthol

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DL-Menthol Suppliers

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View Lastest Price from DL-Menthol manufacturers

HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD

Product: DL-Menthol 89-78-1
Price: US $999.00-800.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 5000
Release date: 2024-08-22

Hebei Zhuanglai Chemical Trading Co.,Ltd

Product: L-Menthol / Dl-Menthol / Menthol Crystal 89-78-1
Price: US $180.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 20ton
Release date: 2024-04-19

Hebei ZB Gamay Biological Technology Co.,Ltd

Product: Menthol 89-78-1
Price: US $0.00-0.00/kg
Min. Order: 1kg
Purity: 95.00%
Supply Ability: 1000kg
Release date: 2022-12-21

89-78-1, DL-MentholRelated Search:

N,N-Dimethylcyclohexylamine METHYLCYCLOHEXANOL 3-Methyl-2-butanone 2-Methylcyclohexanol Chloromethyl isopropyl carbonate 2-Methyl-2-propenoic acid cyclohexyl ester (+)-MENTHOL 1-Ethynyl-1-cyclohexanol 1-Methylcyclohexanol Cyclohexanol (+)-ISOMENTHOL ISOPULEGOL, TECH. G-STROPHANTHIN DIGITOXIGENIN LANATOSIDE B L-Menthol DL-Menthol, racemic,DL-MENTHOL USP (RACEMIC) SYNTHETIC UZARIN

Mentol

(1R,2R,5S)-5-methyl-2-propan-2-yl-1-cyclohexanol

Menthol 89-78-1

component of Dermoplast

component of Robitussin cough drops

component of Theragesic

Cyclohexanol, 2-isopropyl-5-methyl-

cyclohexanol,2-isopropyl-5-methyl-

Fancol menthol

Fisherman's friend lozenges

(1α,2β,5α)-5-methyl-2-(1-methylethyl)cyclohexanol

2-(1-methylethyl)-5-methyl-cyclohexanol

2-isopropyl-5-methyl-cyclohexano

5alpha-Methyl-2beta-(1alpha-methylethyl)cyclohexanol

dl-p-Menthan-3-ol

dl-Peppermint

DL-Menthol, 99% 100ML

DL-Menthol, 99% 500ML

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I-menthol

DL - mint

factory supply DL-Menthol CAS 89-78-1

Best price DL-Menthol or Menthol CAS: 89-78-1 manufacturer

DL-MENTHOL CAS NO.: 89-78-1

(1R,2S,5R)-rel-2-Isopropyl-5-Methylcyclohexanol

(+/-)-Menthol raceMic, >=98.0% (GC)

menthol crystal extract

89-78-1

DL-MENTHOL FCC

MENTHOL 99%

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MentholCrystal,PolarBearBrand,MeltingPoint42-44DegreeC

DL-Menthol, 98+%

Menthol=Hexahydrothymol

DEXTRO,LAEVO-MENTHOL

Cyclohexanol, 5-methyl-2-(1-methylethyl)-, (1R,2S,5R)-rel-

MENTHOL(RG)

(1alpha,2beta,5alpha)-5-Methyl-2-(1-methylethyl)-cyclohexanol

headachecrystals

Menthacamphor

Menthol terpine hydrate

Menthomenthol

Peppermint camphor

peppermintcamphor

Racemic menthol

Therapeutic mineral ice

tra-killtrachealmitekiller

MENTHOL 99

DL-Menthol

p-Menthan-3-ol

MENTHOL LIQUID

2-Isopropyl-5-methylcyclohexanol, Hexahydrothymol, Menthol

Menthol CRS

Mentha canadaensis