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Pure vanillin, also known as vanillin, chemical name is 3-methoxy-4-hydroxybenzaldehyde. It is an organic compound extracted from vanilla beans of the Rutaceae family. It is white to yellowish crystalline or crystalline powder, slightly sweet, soluble in hot water, glycerin and alcohol, and insoluble in cold water and vegetable oil. The aroma is stable and not volatile at high temperature. It is easy to oxidize in the air and discolor in case of alkaline substances.
It has the aroma of vanilla beans and strong milk aroma, plays the role of enhancing and fixing fragrance, and is widely used in cosmetics, tobacco, pastry, candy, baking food and other industries. It is one of the largest synthetic flavor varieties in the world. The industrial production has a history of more than 100 years. The recommended dosage in the final flavored food is about 0.2-20000 mg/kg. According to the regulations of the Ministry of Health of the People's Republic of China, vanillin can be used in formula foods for older infants and young children and cereal foods for infants and young children (excluding formula cereal powder for infants and young children), with the maximum usage of 5mg/mL and 7mg/100g respectively. It can also be used as plant growth promoter, fungicide, lubricating oil defoamer, etc. It is also an important intermediate of synthetic drugs and other spices. In addition, it can also be used as a polishing agent in the electroplating industry, as a ripening agent in agriculture, as a deodorant in rubber products, as an anti-hardening agent in plastic products, and as a pharmaceutical intermediate. It is widely used.
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Chemical Formula |
C8H8O3 |
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Exact Mass |
152.05 |
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Molecular Weight |
152.15 |
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m/z |
152.05 (100.0%), 153.05 (8.7%) |
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Elemental Analysis |
C, 63.15; H, 5.30; O, 31.55 |
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Food:
Food preservatives are divided into natural preservatives and chemical preservatives, which are used in food production, circulation, storage and other processes to maintain food sensory properties, improve edible value, and extend storage time. Compared with chemical preservatives, natural preservatives have the advantages of harmless to the environment, low production cost, good biocompatibility and good preservation effect. Pure Vanillin in food can be accurately detected by UV-visible spectrophotometry, chromatography, electrophoresis and other conventional methods. It is a safe food preservative. The application in food storage and preservation can be divided into bacteriostasis, antioxidation, stabilization of other ingredients in food and inhibition of respiratory rate.
Bacteriostatic:
It is a natural bacteriostatic agent, which often acts together with other bacteriostatic methods in the field of food, and has different bacteriostatic effects on different strains. The bacteriostatic effect is related to its concentration and pH value. Higher concentration and lower pH value are beneficial to improve the bacteriostatic effect. The bacteriostatic effect on different strains is different. Compared with other strains, the bacteriostatic effect on Escherichia coli is better. It has inhibitory effect on a variety of yeast. High concentration can improve its antibacterial effect, but high concentration can not kill yeast immediately. Compound fresh-keeping realizes the synergy between fresh-keeping agents (or fresh-keeping methods), which is a generally accepted method for preserving fruits and vegetables. The antibacterial effect of spices often has synergy and the dosage is smaller than that of single use. For example, for preventing Aspergillus niger pollution, the effective bactericidal dose alone is 0.5%, while the mixture of 0.05% vanillin and 0.0025% cinnamaldehyde can play a bactericidal role.
It also plays an important role in auxiliary bacteriostasis and sterilization. In the current production process, thermal sterilization is still the most common sterilization method in fruit juice processing, and its treatment methods are generally pasteurization and high-temperature instantaneous sterilization. The traditional sterilization methods often lead to the destruction of nutrients in fruit juice and browning of products.
Antioxidant:
The action mechanism of antioxidants with similar structure is different. It mainly accelerates the removal of free radicals through the oxidation product vanillic acid. Its antioxidant effect can significantly prolong the shelf life of oily food and mask its rancidity. The isomer, o-vanillin (3-methoxy-2-hydroxybenzaldehyde), has been proved to have the function of scavenging peroxynitrite anion, but it is not a good free radical scavenger.
Other ingredients in stable food:
It has been proved that the reaction product of pure vanillin can help stabilize other ingredients in food: resveratrol is a natural functional component. In order to improve its stability and give full play to its functional role, the reticulated chitosan microspheres formed after the reaction and chitosan are used to coat resveratrol, which is helpful to control the release of resveratrol; The condensation product and amino group has a good ability of complexing with metal ions, and can effectively improve the stability of its inclusion material.
Synthesis Methods
Vanillin, also known as vanillyl aldehyde or 3-methoxy-4-hydroxybenzaldehyde, is a synthetic fragrance with a distinct vanilla-like odor. It is widely used in the food, perfumery, and pharmaceutical industries due to its pleasant aroma. The synthesis involves several methods, which can be broadly categorized into chemical synthesis and enzymatic synthesis. Below is a detailed introduction to some common chemical synthesis methods:
Chemical Synthesis Methods
- Initial Steps: N,N-dimethylaniline is acidified with hydrochloric acid to form its salt, which is then nitrated with sodium nitrite to obtain p-nitrosodimethylaniline hydrochloride.
- Condensation: This intermediate is then condensed with guaiacol and formaldehyde at a temperature range of 41-43°C.
- Extraction and Purification: Benzene is used for extraction, followed by distillation and recrystallization with benzene and water respectively. Drying at 50°C yields the final product.
- Source Material: Lignin sulfonates containing hydroxybenzyl alcohol structural units, derived from sulfite pulp waste liquor, are used.
- Oxidation and Hydrolysis: Under alkaline conditions, the lignin sulfonates are oxidized and subsequently hydrolyzed to produce vanillin.
- Reactants: 2-methoxyphenol, sodium glyoxylate, and sodium hydroxide are mixed in water.
- Reaction Conditions: The mixture is stirred and maintained at 25°C for 24 hours with a specific mass ratio (2-methoxyphenol: sodium glyoxylate: sodium hydroxide: water = 40:24:13:950).
Enzymatic Synthesis Method
In recent years, enzymatic synthesis has emerged as a promising alternative due to its environmental friendliness and mild reaction conditions.
Enzyme Involvement
It synthase is an enzyme that catalyzes the synthesis from specific substrates.
Preparation
The enzyme is purified and extracted under appropriate conditions. It then catalyzes the conversion of specific substrates into vanillin in the presence of cofactors.
Pure vanillin, also known as 4-hydroxy-3-methoxybenzaldehyde, is a naturally occurring organic compound primarily found in the vanilla bean, the fruit of the vanilla orchid. It is responsible for the distinctive, sweet, and creamy aroma and flavor associated with vanilla. Commercially, it is widely used as a flavoring agent in foods, beverages, pharmaceuticals, and cosmetics. It is also employed in the fragrance industry due to its pleasant scent. While naturally sourced vanillin is extracted from vanilla beans, which can be costly and labor-intensive, synthetic vanillin is also produced industrially through chemical synthesis, making it more affordable and accessible for various applications. Both natural and synthetic forms are recognized for their ability to enhance the taste and aroma of numerous products.
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Molecular Structure and Composition
The chemical name of Pure Vanillin is 3-methoxy-4-hydroxybenzaldehyde (or 4-hydroxy-3-methoxybenzaldehyde), with the molecular formula of C₈H₈O₃ and a relative molecular mass of 152.15. The molecular structure of it contains three key functional groups:
Aldehyde group (-CHO)
Gives the typical reactivity of vanillin aldehyde compounds, such as undergoing oxidation reactions to form carboxylic acids, or participating in condensation reactions to form more complex molecules.
Phenolic hydroxyl group (-OH)
Has weak acidity and can participate in esterification, etherification, etc. reactions. It is also sensitive to light and prone to photoreaction.
Methoxy group (-OCH₃)
As an electron-donating group, it affects the electron distribution of the benzene ring, thereby regulating the reactivity of the molecule.
Physical Properties
Appearance and Form: White to slightly yellow crystalline powder or needle-like crystals, with a similar aroma to vanilla beans, and a slightly sweet taste.
Solubility:
Easy to dissolve in ethanol, ether, chloroform, acetic acid, and volatile oils at high temperatures.
Soluble in water (10 g/L, 25℃) and glycerol.
Not easily soluble in cold water and vegetable oils.
Melting Point and Boiling Point:
Melting Point: 81-83℃.
Boiling Point: 284-285℃ (standard pressure).
Density and Refractive Index:
Density: Approximately 1.056-1.06 g/cm³.
Refractive Index: 1.555-1.588 (varies depending on measurement conditions).
Stability:
Not stable to light, gradually oxidizing in air, and the color may darken.
It is prone to color change when encountering alkali, possibly related to the reaction with phenolic hydroxyl groups.
Highly hygroscopic, requires moisture-proof storage.
Chemical Stability and Reactivity
Thermal Stability: Relatively stable at room temperature, but prone to decomposition upon heating. The decomposition temperature range is 64-110℃, depending on environmental conditions. Decomposition at high temperatures may release toxic gases such as nitrogen, carbon monoxide, and organic cyanides.
Light Stability: Sensitive to light, may undergo color change or decomposition when exposed to light. Therefore, storage should be protected from light.
Redox Reaction:
The aldehyde group is easily oxidized to carboxyl groups, generating vanillin acid.
Under the action of strong reducing agents, the aldehyde group can be reduced to alcohol hydroxyl groups.
Acid-base Reaction:
The phenolic hydroxyl group has weak acidity and can react with strong bases to form phenolate salts.
In alkaline conditions, vanillin may undergo isomerization or decomposition reactions.
Condensation Reaction: The aldehyde group can react with other compounds containing active hydrogens (such as alcohols, amines, etc.) to form derivatives such as acetal, Schiff base, etc.
Safety and Toxicity
Acute Toxicity
The oral toxicity is relatively low, but it has irritation to the skin and mucous membranes. The LD₅₀ for rats is 1580 mg/kg, and for mice it is 4333 mg/kg.
Skin and Eye Irritation
May cause redness, pain, or irritation symptoms on the skin or eyes. Protective gloves and eye protection masks should be worn during operation.
Inhalation Toxicity
Inhalation of vanillin dust or vapor may cause respiratory irritation symptoms, such as coughing, asthma, etc.
Environmental Toxicity
Harmful to aquatic organisms, and should be avoided from being released into the environment.
Frequently Asked Questions
Is vanillin made from plastic?
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Scientists Turn Plastic Waste into Vanilla Flavoring Using Engineered Bacteria. Scientists from the University of Edinburgh have developed a novel approach to combat plastic pollution by converting plastic waste into vanillin, the primary component responsible for vanilla's flavor and aroma.
Is vanillin the same as vanilla?
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Vanilla is the spice from the pod of orchids from the vanilla plant. So, what is vanillin or the ingredient that we commonly see on the back of our ice cream? Vanillin is actually the molecule that gives vanilla its distinct smell and taste.
Is vanilla good for the liver?
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Vanilla has been used for centuries in various forms to help relieve inflammation, particularly of the liver. Good news for sufferers of gout, arthritis, and other conditions. Studies have shown that the active ingedient, vanillin, can reduce cholesterol levels in the human body.
What destroys the liver the most?
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Too Much Alcohol
Alcoholic fatty liver, which causes liver inflammation (alcoholic hepatitis), eventual scarring (cirrhosis) and even liver cancer, is a process that begins on as little as four drinks a day for men and two for women. By the time you show symptoms, your liver may be damaged beyond repair.
Is vanilla anti-inflammatory?
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Vanillin has anti-inflammatory properties that can reduce inflammation from multiple causes. One of these causes is inflammation from cold sores. The antibacterial properties of vanilla may also help cure cold sores. Additionally, vanilla may be linked to reducing inflammation in the whole body overall.
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