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Centella asiatica L. callus mediated biosynthesis of silver nanoparticles, optimization using central composite design, and study on their antioxidant activity

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Abstract

This study proposes the tenacious vitality for biomass production and eco-friendly, cost-effective, renewable silver nanoparticles (AgNPs) biosynthesis approach for beneficial utilization. For the first time, halogen dried callus biomass obtained from petioles of Centella asiatica L. (CA) was utilized for biosynthesis of AgNPs through process optimization using face-centered central composite design. Non-embryogenic, whitish-yellow callus propagated on B5 medium augmented with 2,4-D (1.00 µM) and TDZ (0.50 µM) was utilized for the synthesis of AgNPs. Qualitative and quantitative phytochemical estimation indicated the presence of active ingredients such as total phenolic, flavonoids, tannins, saponins, and terpenoids in aqueous callus extract. The characterization techniques reinforced each other and affirmed the ability of CA callus extract to fabricate AgNPs with an average size of 32.9 nm and maximum absorbance at 443 nm. Also, the presence of elemental Ag, spherical shape, and crystalline nature was confirmed by SEM and EDX, TEM, and XRD analysis respectively. FTIR and phytochemical screening confirmed the presence of bioactive functional groups in CA callus AgNPs. Both callus extract and AgNPs exhibited potential antioxidant activity in a dose-dependent manner.

Key message

The callus culture obtained from agricultural residue of Centella asiatica served as a novel source for statistical optimization and biosynthesis of spherical and crystalline silver nanoparticles possessing potent antioxidative property.

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Abbreviations

CA:

Centella asiatica L.

2,4-D:

2,4-Dichlorophenoxyacetic acid

AgNPs:

Silver nanoparticles

ANOVA:

Analysis of variance

B5:

Gamborg’s B5 medium

BAP:

6-Benzylaminopurine

CCD:

Face Centred Central Composite design

DDW:

Double distilled water

DLS:

Dynamic light scattering

DPPH:

1,1-Diphenyl-2-picrylhydrazyl

EDX:

Energy dispersive X-ray

FTIR:

Fourier-transform infrared

F value:

Fisher’s statistical test

Kn:

Kinetin

MS:

Murashige and Skoog medium

P value:

Probability value

RSM:

Response surface methodology

SEM:

Scanning electron microscope

TDZ:

Thidiazuron

TEM:

Transmission electron microscopy

XRD:

Powder X-ray diffraction

Zn:

Zeatin

R2 value:

Coefficient of determination

IC 50:

Half maximal inhibitory concentration

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Acknowledgements

Authors gratefully acknowledge the Council of Scientific and Industrial Research (CSIR), New Delhi, India for the financial support in the form of Senior Research Fellowship under the SRF-Direct Program to Ms. Rashmi Venkatasubbaiah (8/584 (0002)/18EMR-1) The authors also acknowledge JSS STU, Mysuru; VTU, Belagavi; SAIF-IIT Bombay for HR-TEM.

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Authors

Contributions

RV performed tissue culture, conducted all the experiments, data analysis, and interpretation, conceptualization, and wrote the original and revised draft manuscript. HBP supervised tissue culture, review, and correction of the manuscript. KRS supervised, conceptualization, data analysis, review, and correction of the manuscript.

Corresponding author

Correspondence to Konasur Rajesh Sanjay.

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Conflict of interest

The authors declare that they have no conflicts of interest.

Additional information

Communicated by Ranjith Pathirana.

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Rashmi, V., Prabhushankar, H.B. & Sanjay, K.R. Centella asiatica L. callus mediated biosynthesis of silver nanoparticles, optimization using central composite design, and study on their antioxidant activity. Plant Cell Tiss Organ Cult 146, 515–529 (2021). https://doi.org/10.1007/s11240-021-02086-3

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  • DOI: https://doi.org/10.1007/s11240-021-02086-3

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