Related Experiment Video
Updated: Mar 2, 2026
05:50
Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
11.3K
An Optimized Facile Procedure to Synthesize and Purify Allicin
Frank Albrecht1, Roman Leontiev2,3, Claus Jacob4
1Department of Plant Physiology, RWTH Aachen University, D-52056 Aachen, Germany. frank.albrecht@rwth-aachen.de.
Molecules (Basel, Switzerland)
|May 11, 2017
Summary
Researchers improved a method for synthesizing allicin, a potent antibiotic compound from garlic. This enhanced protocol yields high-purity allicin (>98%) with over 91% efficiency, making it accessible for laboratory use.
Area of Science:
- Organic Chemistry
- Natural Product Synthesis
- Pharmacology
Background:
- Allicin, a reactive sulfur species (RSS) from garlic (Allium sativum L.), exhibits broad-spectrum antibiotic properties.
- Allicin is effective against multiple drug-resistant (MDR) strains, highlighting its therapeutic potential.
- Previous synthesis protocols, such as the 2001 method by Lawson and Wang, provide a foundation for allicin preparation.
Purpose of the Study:
- To refine and improve the existing protocol for allicin synthesis.
- To elucidate the reaction mechanism governing allicin formation.
- To achieve high-purity allicin with high yield using standard laboratory equipment.
Main Methods:
- Oxidation of diallyl-disulfide (DADS) using hydrogen peroxide (H₂O₂) with acetic acid as a catalyst.
- Kinetic analysis to determine reaction order with respect to DADS and H₂O₂.
- Analysis of reaction progress and mechanism using high-performance liquid chromatography (HPLC).
- Verification of product identity and purity via liquid chromatography-mass spectrometry (LC-MS) and proton nuclear magnetic resonance (¹H-NMR).
Main Results:
- The improved synthesis protocol yields allicin with high purity (>98%).
- An overall yield exceeding 91% was achieved for the synthesized allicin.
- The reaction kinetics were determined to be zero-order with respect to DADS and first-order with respect to H₂O₂.
- The method is reproducible using standard biological laboratory equipment.
Conclusions:
- The optimized protocol provides a reliable and efficient method for preparing high-quality allicin.
- This accessible synthesis route facilitates further research and application of allicin.
- The findings contribute to the understanding of allicin synthesis mechanisms and its potential as an antibiotic agent.
Related Concept Videos
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
13.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
13.2K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.9K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.9K
01:22Preparation of 1° Amines: Azide Synthesis
4.7K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.7K
01:21Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
5.0K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
5.0K
02:34Preparation of Alkynes: Dehydrohalogenation
18.5K
Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
18.5K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.2K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.2K