Evaluation of bacterial uptake, antibacterial efficacy against Escherichia coli, and cytotoxic effects of moxifloxacin-loaded solid lipid nanoparticles

LNP	Particle size (nm)	Polydispersity index	Zeta potential (mV)	Encapsulation efficiency (%)
SLN1	181.6±1.27	0.25±0.02	-14.6±0.32	68.61±0.20
SLN2	201.8±1.65	0.29±0.02	-17.5±0.14	74.53±0.34
NLC1	176.8±1.90	0.57±0.23	-11.6±0.61	77.82±0.21
NLC2	132.4±1.62	0.51±0.53	-6.3±0.38	77.17±0.21

[i] Results are represented as means ± standard deviations

Table 3

Stability of lipid nanoparticles stored for one month at +4 °C

	Particle size (nm)		Polydispersity index		Zeta potential (mV)
Type of LNPs	Baseline value	After one month storage	Baseline value	After one month storage	Baseline value	After one month storage
SLN1	181.6±1.27	186.1±2.89	0.25±0.02	0.36±0.25	-14.6±0.32	-10.0±0.51*
SLN2	201.8±1.65	200.5±3.56	0.29±0.02	0.39±0.12	-17.5±0.14	-11.5±0.45*
NLC1	176.8±1.90	180.3±1.64	0.57±0.23	0.60±0.46	-11.6±0.61	-8.30±0.78
NLC2	132.4±1.62	135.2±3.98	0.51±0.53	0.65±0.22	-6.3±0.38	-5.62±0.96

[i] Results are represent as means ± standard deviations. * significant difference from baseline (p<0.05)

TEM images of SLN1 (a), SLN2 (b), NLC1 (c), and NLC2 (d)

Flow cytometry results (a: blank NPS; b: fluorescein solution; c: SLN1; d: SLN2; e: NLC1; f: NLC2)

Photomicrographs show bacterial uptake of formulations (a: fluorescein solution; b: SLN1; c: SLN2; d: NLC1; e: NLC2)(40× magnification)

Table 4

Antibacterial activity of MOX-loaded SLNs and NLCs

Formulations	Inhibition diameter (mm)	Minimal inhibition concentration (μg/mL)
Standard MOX solution for SLNs * (0.68 mg)	33±0.07	0.041
SLN1	34±0.10***	0.020
SLN2	32±0.11	0.041
Standard MOX solution for NLCs** (0.78 mg)	35±0.08	0.023
NLC1	36±0.12	0.023
NLC2	35±0.05	0.023

* The concentration was equal to the amount of MOX loaded into SLNs.

** The concentration was equal to the amount of MOX loaded into NLCs.

*** significant difference p<0.05

Table 5

Cytotoxic effects of MOX, MOX-free, and MOX-loaded LNPs in RAW 264.7 cells

RAW 264.7 cell viability (%)
	24 h				48 h				72 h
	0.010 µg/mL	0.025 µg/mL	0.05 µg/mL	0.1 µg/mL	0.010 µg/mL	0.025 µg/mL	0.05 µg/mL	0.1 µg/mL	0.010 µg/mL	0.025 µg/mL	0.05 µg/mL	0.1 µg/mL
MOX	88.65±0.09	69.05±0.35	56.48±0.01	43.90±0.03	89.42±0.02	73.98±0.33	59.43±0.02	40.01±0.10	86.62±0.23	83.49±0.08	54.58±0.02	31.93±0.11
SLN1+MOX	81.56±0.26	75.43±0.29	75.92±0.23	74.55±0.23	94.62±0.02	81.95±0.11	71.44±0.03	58.43±0.06	92.13±0.08	91.46±0.34	89.06±0.28	73.70±0.22
SLN1	95.30±0.08	68.91±0.12	62.78±0.25	57.75±0.01	95.75±0.29	91.22±0.05	85.44±0.06	64.09±0.03	87.12±0.27	82.65±0.09	73.35±0.11	69.72±0.17
SLN2+MOX	93.14±0.08	80.42±0.19	66.66±0.46	62.10±0.21	88.73±0.06	77.09±0.12	63.16±0.12	56.05±0.04	92.13±0.08	91.46±0.34	89.06±0.28	73.71±0.22
SLN2	90.98±0.30	86.81±0.12	64.91±0.09	60.60±0.31	96.51±0.22	94.42±0.12	80.82±0.08	68.49±0.22	96.02±0.33	87.31±0.27	69.95±0.09	55.88±0.06
NLC1+MOX	80.46±0.09	81.65±0.18	85.84±0.26	81.47±0.09	88.72±0.09	72.27±0.04	62.23±0.02	51.10±0.15	85.24±0.09	76.56±0.30	73.78±0.09	56.03±0.32
NLC1	89.19±0.13	78.73±0.17	70.83±0.33	53.27±0.04	92.75±0.13	82.93±0.04	63.82±0.09	54.44±0.05	89.70±0.09	80.44±0.08	63.51±0.35	54.76±0.20
NLC2+MOX	78.43±0.31	65.99±0.05	56.58±0.29	50.72±0.04	76.23±0.27	59.40±0.03	53.59±0.06	53.05±0.08	94.10±0.27	79.09±0.03	73.90±0.06	51.68±0.17
NLC2	85.54±0.07	60.58±0.10	56.67±0.26	50.07±0.16	83.62±0.06	62.94±0.12	54.81±0.05	52.27±0.04	91.99±0.42	82.25±0.12	74.99±0.05	54.11±0.09

[i] Results were given as means ± standard deviations

References

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Articles in this issue

DOI: https://doi.org/10.2478/aiht-2022-73-3667 | Journal eISSN: 1848-6312 (formerly 0004-1254) | Journal ISSN: 0004-1254

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Language: English, Croatian

Page range: 260 - 269

Submitted on: Jul 1, 2022

Accepted on: Nov 1, 2022

Published on: Dec 30, 2022

Published by: Institute for Medical Research and Occupational Health

In partnership with: Paradigm Publishing Services

Keywords:

antibiotic,

biocompatibility,

drug resistance,

E. coli,

lipid-based nanoparticles,

RAW 264.7 cell line

Related subjects:

Medicine,

Basic medical science,

Basic medical science, other

© 2022 Merve Eylul Kiymaci, Gizem Ruya Topal, Ozgur Esim, Merve Bacanli, Cansel Kose Ozkan, Onur Erdem, Ayhan Savaser, Yalcin Ozkan, published by Institute for Medical Research and Occupational Health
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 73 (2022): Issue 4 (December 2022)

Evaluation of bacterial uptake, antibacterial efficacy against Escherichia coli, and cytotoxic effects of moxifloxacin-loaded solid lipid nanoparticles

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