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Table 4 Biosynthesis of metallic NPs using various algae and their biomedical applications

From: Biogenic metallic nanoparticles as game-changers in targeted cancer therapy: recent innovations and prospects

MNPs/MONPs

Algae used

Metal precursor (medium) used

Morphology

Biomedical application

Findings

References

Fe2O3/Fe3O4

Ulva lactuca

Iron (III) chloride

Spherical

20 and 40 nm

Anticancer, anti-diarrheal activity

Significant cytotoxicity was observed in cancer cell lines treated with NPs at higher concentrations (50 mg/mL and 100 mg/mL). The zone of inhibition by Ulva lactuca-mediated NPs against E. coli and S. aureus were 29 ± 1 mm and 17 ± 2 mm, respectively

[182]

Colpomenia sinuosa, Pterocladia capillacea

Iron (III) chloride

Spherical

11.24–33.71 nm, 16.85–22.47 nm

Antibacterial, antifungal

Fe3O4 NPs demonstrated superior antifungal efficacy against A. flavus (9 mm) and F. oxysporum (6 mm) in contrast to Fe3O4 NPs derived from P. capillacea (7 & 5 mm)

[183]

Gracilaria edulis

Iron (III) chloride

Cubic

20 nm–26 nm

Antibacterial, antifungal

NPs inhibited P. aerogenosa (bacteria), A. nidulans, and C. albicans (fungi)

[184]

Oscillatoria limnetica

Iron chloride hexahydrate

Trigonal rhombohedral

Antibacterial, antioxidant, anticancer

Maximum antifungal activity was observed against Aspergillus versicolor (MIC value 27 µg/mL and LD50 value 47 µg/mL). B. subtilis was the most suspected (MIC: 14 µg/mL) and E. coli was the least suspected strain (MIC 35 µg/mL)

[185]

CuO

Bifurcaria bifurcata

Copper (II) sulfate

Spherical

20.66 nm

Antibacterial

Zones of inhibition for S. aureus and Enterobacte aerogenes was 14 mm and 16 mm, respectively

[186]

Sargassum polycystum

Copper solution

–

Antibacterial, antifungal, anticancer

More antibacterial activity was shown in P. aeruginosa (15 ± 0.5 mm) than Shigella dysenteriae (6 ± 0.5 mm). IC50 value for NPs was 61.25 μg/mL

[178]

Spirulina platensis

Copper (II) acetate

30–40 nm

Antibacterial

Maximum zone of inhibition (28.0 ± 0.41 mm) was shown against P. vulgaris

[187]

ZnO

S. marginatum

Zinc nitrate hexahydrate

80–126 nm

Antiviral

NPs demonstrated 99.09% anti-dengue activity in C6/36 cell line

[188]

Sargassum muticum

Zinc acetate dihydrate

–

Anticancer

 > 55% cells survived at 175 μg/mL of ZnO NPs. Cell viability was < 40% 175 μg/mL. HepG2 cell survival percentage was 4.5%. Maximum radical scavenging was observed up to 89% at 2800 μg/mL with an EC50 value of 600 μg/mL

[189]

Anabaena cylindrica

Zinc sulfate

Rod

40–60 nm

Anticancer, antibacterial

ZnO NPs had 50% reduction in cellular viability at 3% dose, while commercial ZnO showed an ED50 at 6% of doses. Zone of inhibition against P. aeruginosa and S. aureus was 10–22 mm and 9–12 mm, respectively

[190]

Ag

Caulerpa racemosa

Silver nitrate

Spherical/triangular

10 nm

Antibacterial

Zone of inhibition against P. mirabilis was 14 mm at 15 µL and 7 mm against S. aureus at 5 µL

[191]

Spirulina platensis Oscillatoria sp

Silver nitrate

Spherical

14.42–48.97 nm

Antiviral

90% reduction in cytopathic effect of HSV-1 by Ag NPs, with a high reduction rate (49.23%)

[192]

Pithophora oedogonia

Silver nitrate

Cubical/hexagonal

25–44 nm

Antibacterial

Largest zone of inhibition observed against P. aeruginosa (17.2 mm) followed by E. coli (16.8 mm)

[193]

Caulerpa serrulata

Silver nitrate

Spherical

10 ± 2 nm

Antibacterial, catalytic

Maximum inhibition zone (21 mm at 75 μL) was observed against E. coli, while lowest inhibition zone (10 mm at 50 μL) was shown for S. typhi

[194]

Au

Spirulina platensis Oscillatoria sp.

Tetrachloroauric (III) acid trihydrate

Octahedral/Pentagonal/triangular

15.60–77.13 nm

Antiviral

90% reduction in cytopathic effect of HSV-1 by Au NPs at 31.25 μL with a high reduction rate of Au NPs (42.75%)

[192]

Sargassum wightii

Chloroauric acid

–

Antiviral

Au NPs showed cell viability of 93.12–85.18%

[195]

Gracilaria corticata

Chloroauric acid

Spherical

45–57 nm

Antimicrobial, antioxidant

Antibiotic-conjugated Au NPs showed antimicrobial activity against E. coli (24 mm) and E. aerogenes (21 mm). S. aureus (19 mm) showed the moderate antimicrobial activity

[196]

Padina gymnospora

Gold salt

Spherical/triangular/hexagonal

9–21 nm

Anticancer

50% reduction in cell viability in HepG2 (IC50 value of 51.9 nM) was recorded

[197]