Researchers have isolated red and blue antibacterial compounds associated with the venom of the Mexican scorpion Diplocentrus melici. They are 1,4-benzoquinone derivatives—not colorful medicines—and their reported activity comes from laboratory experiments and a mouse study, not human treatment. A 2025 study extended the blue compound’s testing to drug-resistant Acinetobacter baumannii, but it remains a research lead rather than an approved antibiotic.
What are the red and blue compounds?
The compounds are colored 1,4-benzoquinone derivatives reported in a 2019 study of Diplocentrus melici, a Mexican scorpion. The venom itself was initially described as a white, viscous liquid that changed color when exposed to air. Researchers processed it to purify red and blue fractions, then used analytical chemistry to identify them. Because the venom yielded only tiny amounts, the team also synthesized material in the laboratory for structural analysis and biological tests. Read the 2019 study in Proceedings of the National Academy of Sciences.
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The word “antibiotics” can be misleading here: the compounds have demonstrated antibacterial activity in experiments, but the findings do not establish that either is a safe or effective medicine for people.
What bacteria did the studies test?
Red compound: Staphylococcus aureus
The 2019 study reported that the red compound inhibited S. aureus, with a reported minimum inhibitory concentration (MIC) of 4 µg/mL. An MIC is the concentration that prevents visible bacterial growth under the study’s test conditions; it is not a recommended dose for a patient.
Blue compound: tuberculosis bacteria
The same paper reported blue-compound activity against Mycobacterium tuberculosis, including a multidrug-resistant strain. Its reported MIC against M. tuberculosis was also 4 µg/mL. The researchers additionally reported activity in a mouse tuberculosis infection model. Neither a laboratory result nor an animal model shows that a treatment works safely in humans.
Blue compound: drug-resistant Acinetobacter baumannii
A 2025 follow-up reported bactericidal activity against multidrug-resistant clinical isolates of A. baumannii, including isolates resistant to carbapenems and colistin. The authors described the blue benzoquinone as a potential lead for developing a new class of antibiotics; that framing signals an early research direction, not a finished drug. Read the 2025 study in The Journal of Antibiotics.
What does the resistance experiment show?
In one sequential-culture experiment, researchers exposed a reference strain of A. baumannii to sub-inhibitory concentrations of the blue compound over 35 days and reported no observed resistance development. This is a result for that strain and laboratory protocol. It does not establish that resistance cannot emerge in other strains, under different conditions, or during clinical use.
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Activity changed in protein-containing medium
The 2025 study found that protein-containing culture medium reduced the compound’s antibacterial activity. The authors suggested that binding to proteins could affect bioavailability. A compound’s performance in a test system can therefore differ from what would happen in a human body.
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Safety and mechanism still matter
The 2019 paper reported cytotoxic effects in neoplastic cell lines and human peripheral blood mononuclear cells. Those observations mean antibacterial activity should not be mistaken for proven selectivity or safety. The mechanism of the blue compound still requires determination, and its characterization for possible clinical application remains ongoing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are these the same as scorpion-venom antimicrobial peptides?
No. The colored compounds are small benzoquinone derivatives, chemically distinct from antimicrobial peptides also reported in scorpion research. For example, scorpine was reported from Pandinus imperator venom in a 2000 study, while vejovine is a 47-amino-acid peptide reported from Vaejovis mexicanus and tested against selected multidrug-resistant Gram-negative isolates in 2011. These are separate molecules from different species, and their findings should not be treated as evidence about the benzoquinones. The vejovine report also noted hemolytic activity at higher concentrations.
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