Synonym name: L-Abrine; N^α-Methyl-L-tryptophan
Catalogue No.: BP0112
Cas No.: 526-31-8
Formula: C₁₂H₁₄N₂O₂
Mol Weight: 218.256
Botanical Source: the seeds of Abrus precatorius and Desmodium tiliaefolium

Purity: 95%~99%
Analysis Method: HPLC-DAD or/and HPLC-ELSD
Identification Method: Mass, NMR
Packing: Brown vial or HDPE plastic bottle
Can be supplied from milligrams to grams.

For Reference Standard and R&D, Not for Human Use Directly.
Inquire for bulk scale.

HPLC of Abrine

NMR of Abrine

Storage conditions：Short-term storage at 2~8℃, long-term storage at -20 ~ -80℃

Introduction/Overview

Abrine (CAS No.: 526-31-8), an important alkaloid among natural products, has attracted widespread attention in recent years in pharmacology and natural product chemistry. Its chemical structure is N-methyl-L-α-amino acid, specifically an Nα-methyl derivative of L-tryptophan, exhibiting unique biological activity and pharmacological properties. Acacia alkaloids exist not only as secondary metabolites in certain plants, but have also been found to be related to the metabolic processes of E. coli, demonstrating their potential role in microbial metabolic networks. Research shows that acacia alkali has antioxidant activity, can scavenge ABTS-based ion radicals, and to some extent reduce the efficacy of commercial antioxidants such as BHT and Trolox, suggesting its potential application value in antioxidant development.

Currently, research on acacia soda mainly focuses on its chemical properties, pharmacological activity, and druggability evaluation, especially in the field of natural product pharmacology. Its unique structure as an L-tryptophan derivative provides a theoretical basis for in-depth analysis of its mechanism of action. This paper aims to systematically review the chemical structure and physicochemical properties of acacia soda, plant origin and extraction methods, pharmacological activity and mechanism of action, druggability evaluation, and pharmacokinetic characteristics, and finally to prospect its clinical application prospects, providing theoretical support and practical guidance for subsequent related research.

Chemical structure and physicochemical properties

The chemical name of acacia soda is N(α)-methyl-L-tryptophan, with a molecular formula of C12H15N2O2 and a molecular weight of 218.25 Da. Its structural feature is that the Nα-amino group of L-tryptophan is methylated, forming N-methyl-L-α-amino acids. This structure endows acacia with zwitterionic properties, allowing it to exhibit tautomeric forms under different pH conditions.

In terms of physicochemical properties, the LogP value of acacia alkaloid is 0.58, indicating a good balance of hydrophilicity and hydrophobicity, which is beneficial for its distribution and absorption in organisms. The polar surface area (TPSA) is 69.17 Ų, and the number of hydrogen bond acceptors is 4, indicating that it possesses certain polarity and hydrogen bond formation capabilities, which is of great significance for its interaction with biological macromolecules. The lower permeability of the blood-brain barrier suggests limited penetration in the central nervous system, helping to reduce the risk of side effects. Toxicological evaluation showed that acacia alkaloid showed no significant hepatotoxicity, cardiotoxicity, or hERG channel suppression, but Ames-related mutagenicity test results remain unclear and require further safety evaluation.

Plant Origins and Extraction Methods

Acacia spp. is mainly found in the seeds of the leguminous plant Acacia spp., with Abrus precatorius seeds having a higher content. As a source of traditional herbs and natural dyes, acacia seeds provide a foundation for pharmacological activity studies of acacia root alkaloid content and distribution in their seeds.

The extraction method typically uses solvent extraction combined with chromatography separation technology. Common extraction solvents include mixed solutions of methanol, ethanol, and water, which use ultrasound-assisted extraction or reflux extraction to improve extraction efficiency. After concentration and liquid-liquid distribution, the extract was purified using silica gel column chromatography and reversed-phase high-performance liquid chromatography (RP-HPLC). In recent years, supercritical CO2 extraction technology and molecular blotting technology have also been attempted for efficient separation of acacia alkaloids, significantly improving purity and recovery rates.

Additionally, chemical synthesis routes based on acacia base have been reported, mainly achieved through the Nα-methylation reaction of L-tryptophan, making large-scale preparation possible.

Pharmacological activity research

Research on the pharmacological activity of acacia mainly focuses on its antioxidant, antibacterial, and potential antitumor activities.

1. Antioxidant activity
   Acacia alkaloids exhibit significant free radical scavenging ability, especially in ABTS ion scavenging experiments, which have antioxidant effects comparable to BHT (butylhydroxytoluene) and Trolox (vitamin E analogs). Its antioxidant mechanism may be related to the synergistic action of indole rings and amino acid groups in its N-methyl-L-tryptophan structure, effectively capturing free radicals and reducing cell damage caused by oxidative stress.

2. Antibacterial activity
   As one of the metabolites of E. coli, acacia alkaloid exhibits inhibitory effects on Gram-negative bacteria at certain concentrations. Related studies suggest that acacia may exert antibacterial effects by interfering with bacterial protein synthesis or membrane function, but its specific targets and mechanisms still require further exploration.

3. Anti-tumor potential
   Preliminary in vitro experiments show that acacia alkaloid has proliferative inhibitory activity on certain tumor cell lines, possibly related to its regulation of apoptosis-related signaling pathways. Its N-methyl-L-tryptophan structure offers the possibility of binding to intracellular enzymes or receptors, but research on related mechanisms is still in its early stages.

4. Other potential activities
   Some studies suggest that acacia aline may affect neurotransmitter metabolism and immune regulation; however, due to its low blood-brain barrier permeability, the clinical significance of related neuropharmacological effects requires further verification.

Mechanism of action and molecular targets

The mechanism of action of acacia soda is not yet fully elucidated, but based on its structural characteristics and pharmacological activity, it is inferred that it mainly exerts biological effects through the following pathways:

1. Antioxidant mechanism
   The indole ring structure in acacia can stabilize free radicals, reduce the generation of reactive oxygen species (ROS), and protect cells from oxidative damage. Its N-methylated amino acids may enhance molecular stability and improve antioxidant effects. Additionally, acacia alkaloids may indirectly enhance the antioxidant defense system by regulating the expression of intracellular antioxidant enzymes (such as superoxide dismutase and glutathione peroxidase).

2. Molecular targets
   Although the specific target is not yet clear, it is speculated that acacia may interact with enzymes related to tryptophan metabolism (such as tryptophan hydroxylase and indole amine 2,3-dioxygenase), affecting cellular metabolic pathways. Additionally, its inhibitory effect on bacterial protein synthesis suggests possible targeting ribosomes or related RNA transporting synthase.

3. Signal path regulation
   Preliminary data suggest that acacia alkaloids may regulate apoptosis-related signaling pathways, such as Bcl-2 family protein expression in mitochondrial pathways, promoting apoptosis in cancer cells. Additionally, its antioxidant effects help inhibit inflammatory signaling pathways such as NF-κB, providing anti-inflammatory and cytoprotective effects.

4. Metabolic regulation
   As a metabolite of E. coli, acacia sine may participate in the metabolic regulation of microbial communities, affecting the host intestinal microecological balance and thereby impacting the host's health status.

Druggability evaluation and pharmacokinetics

The druggability parameters of acacia sine indicate that it has certain development potential:

• The molecular weight (218.25 Da) falls within the ideal range of drug molecular weight, facilitating absorption and distribution in the body.
• LogP(0.58) indicates moderate hydrophilicity, which is beneficial for oral absorption and distribution in body fluids.
• TPSA (69.17 Ų) and hydrogen bond acceptor count (4) comply with Lipinski's rules, facilitating molecular binding to targets.
• The blood-brain barrier has low permeability, reducing the risk of toxic side effects in the central nervous system.
• Toxicological evaluation showed no significant hepatotoxicity, cardiotoxicity, or hERG channel suppression, indicating high safety.

Pharmacokinetics, currently available data are quite limited. It is speculated that acacia is well absorbed orally and widely distributed in the body, but due to low permeability of the blood-brain barrier, it mainly acts on peripheral tissues. Its metabolic pathway may involve amino acid metabolism enzymes in the liver, and the metabolites still require systematic identification. Excretion routes may be primarily kidney-related, and half-life and bioavailability require further clarification through in vivo pharmacokinetic studies.

Prospects and outlooks for clinical applications

As a natural compound with excellent antioxidant activity and potential pharmacological effects, acacia alkaloid has broad application prospects in the prevention and treatment of various diseases in the future:

1. Antioxidant development
   Due to its excellent free radical scavenging ability, acacia alkaloid can serve as a new natural antioxidant for preventing and treating oxidative stress-related diseases such as cardiovascular diseases, neurodegenerative diseases, and chronic inflammatory diseases.

2. Antibacterial drug adjuvants
   Its inhibitory effect on E. coli and other Gram-negative bacteria suggests that acacia alkaloid can serve as an adjunct to antimicrobial drugs, enhancing antibacterial efficacy or potentially being developed as a novel antimicrobial drug.

3. Antitumor drug research
   Preliminary antitumor activity makes its application possible in the field of tumor treatment. In the future, systematic in vitro and in vitro experiments will be conducted to verify its anti-tumor mechanisms and efficacy, exploring its potential as a chemotherapy adjuvant.

4. Microecological regulators
   As a microbial metabolite, acacia alkaloid is expected to regulate the gut microecology, promote host health, and be used for the prevention and treatment of intestinal diseases and metabolic syndromes.

Future research should focus on safety evaluation, pharmacokinetic characteristics, and mechanisms of action of acacia alkaloids, optimizing its structure by integrating modern drug design methods to improve bioactivity and drug utilization. At the same time, preclinical and clinical trials are being conducted to verify its therapeutic effects and safety, laying the foundation for its clinical application.

Conclusion

Acacia alkalin, as a structurally unique N-methyl-L-tryptophan derivative, exhibits diverse biological activities, especially showing significant potential in antioxidant and antibacterial fields. Its excellent druggability parameters and safety evaluation provide favorable conditions for drug development. Although research on its mechanism of action and pharmacokinetics is still insufficient, with the development of modern molecular biology and pharmacological technologies, acacia alkaloid is expected to play an increasingly important role in natural product pharmacology and new drug development. Future systematic and in-depth research will push acacia cine from the laboratory to clinical practice, becoming an effective natural medicine for treating various diseases.