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Enhanced Carotenoid Production in Rhodococcus kroppenstedtii S12 using Photoactive Cobalt Ferrite Nanoparticles.

Mahmoud S Maher¹, Yasser A Attia², Mary S Khalil¹

¹Department of Botany and Microbiology, Faculty of Science, Cairo University, Giza, 12613, Egypt.

Current Microbiology

|June 20, 2026

Summary

This study isolated Rhodococcus kroppenstedtii S12, a bacterium producing carotenoids. Cobalt ferrite nanoparticles (CoFe₂O₄ NPs) significantly boosted pigment production, yielding bioactive carotenoids with antibacterial and antioxidant properties.

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Area of Science:

Microbiology
Biotechnology
Materials Science

Background:

Natural pigments, particularly carotenoids, are in high demand across food, pharmaceutical, and cosmetic industries.
Efficient and cost-effective production of bioactive pigments is crucial to meet market needs.
Research is exploring novel microbial strains and enhancement strategies for pigment production.

Purpose of the Study:

To isolate and characterize a novel bacterium for bioactive pigment production.
To investigate the efficacy of cobalt ferrite nanoparticles (CoFe₂O₄ NPs) in enhancing pigment yield.
To evaluate the bioactivity of the produced carotenoids.

Main Methods:

Screening and isolation of pigment-producing bacteria.
Identification of carotenoid pigment using LC-MS and mass spectrometry.
Application of CoFe₂O₄ NPs to enhance pigment production.
Assessment of antibacterial and antioxidant activities of the extracted carotenoid.

Main Results:

Rhodococcus kroppenstedtii strain S12 was identified as a potent carotenoid producer.
CoFe₂O₄ NPs, especially when photoactivated, increased carotenoid production by 3.23-fold (37.64 mg/l).
The carotenoid exhibited moderate antibacterial activity (MIC 29-58 µg/ml) and antioxidant properties (IC50 66.97 µg/ml).

Conclusions:

Rhodococcus kroppenstedtii S12 is a promising source for industrial carotenoid production.
CoFe₂O₄ NPs offer a viable strategy for enhancing carotenoid biosynthesis.
The isolated carotenoid possesses valuable bioactivities, suggesting potential therapeutic and industrial applications.