Sudhapriyadharsini S*

PG and Research Deparment of Microbiology, Hindusthan College of Arts & Science, Coimbatore, Tamil Nadu, India

Article history:

Received 13 September 2021
Revised 07 October 2021
Accepted 11 October 2021
Available online 12 October 2021

Keywords:

Copper oxide nano particles
Antibacterial activity
Plant extract
Bacteria
Fungi

In last few decade, several research attempts in the field of nanoscience and nanotechnology due to its distinctive physicochemical and biological properties. Nanoparticles type like copper oxide nanoparticleshas has most attracted due to their multifarious in biological properties and especially suitable in the area of nanomedicine and biomedical sciences. The metal and metal oxide nanoparticles can be synthesized various approaches such as physical, chemical and biogenic methods. Physical and chemical syntheses of nanoparticles are easily obtained desired structure and high purity of the materials. However, physicochemical techniques are high expensive of regents and equipment consume high energy as well as release of high hazards chemicals to the environmental system, which leads to environmental pollutions and hazards to the human and also aquatic animals. In contrast the biogenic synthesis methods are low cost-effective, reliable, eco-friendly and simple way to synthesis of metal oxide nanoparticles. In this review focused on biogenic mediated (Plant, bacteria and fungi) synthesis of copper oxide nanoparticles for their biomedical application of antibacterial activity.

In current few decades, considering the wide range of applications of metal oxide nanoparticles have played an important role in the pharmaceutical, biomedical, environmental and textile industries. Thus important reasons have been worldwide increased in investment in the field of nanotechnology based development. Metal and metal oxide nanoparticles of silver, gold, zinc and copper oxide, zinc oxide as well as iron oxide have been effectively used several biomedical applications of pharmaceutical, antimicrobial, anticancer, drug delivery, agriculture and also included environmental wastewater treatment (Folorunso et al., 2019; Akintelu et al., 2019a-c; Khatereh et al., 2019). Traditionally, the nanoparticles have been synthesis followed two approaches methods of physical, chemical, microwave, sol gel, sonochemical, irradiation, thermal decomposition, quick precipitation and hydrothermal have reported, which has been using chemical precursor for reducing and stabilizing agents to form of  metal and metal oxide nanoparticles (Wang et al., 2010; Zhu et al., 2014; Lee, et al., 2018). Another green synthesis method has been used biomolecules based liquids, which is act as capping and reducing of metal oxide nanoparticles. In this techniques have been using of less chemical solvents and moreover, faster and feasible synthesis method. Recently, several researchers and scientist have focusing on biological rout synthesis of metal oxide nanoparticles such as copper oxide nanoparticles which good exhibit biological and photocatalytic activity than those obtained from metal nanoparticles have been reported.

Copper is an important element for plants, animals and humans. About 2-4 mg minimum amount of copper has required daily intake of human life, but it must be uptake from dietary sources of food and drink (Raha et al., 2020; Bost et al., 2016). The copper oxide is major function of cofactor and many enzymes involved in regulation of cell signaling pathway, neuropeptide synthesis, antioxidant defense, and triggering human immune system and also inhibit of pathogens (Latorre et al., 2019). Copper have been stimulated and regulated of immune cells such as neutrophils, macrophage and helper T cells in the human immune system (Georgopoulos et al., 2001). In furthermore, copper is essential mineral nutrition for the plant growth and important key role of various biochemical and physiochemical pathways, and it also act as enzymes cofactor to functioning synthesis of proteins such as cytochrome c oxidase, amino oxidase and plastocyanin (Castillo-Duran et al., 1988; Ghaderian et al., 2012; Sifri et al., 2016. Recently, several methodologies have been focused the biogenic synthesis of copper oxide nanoparticle on the utilization of plant aqueous extracts such as Carica papaya (Sankar et al., 2014), Ruelliatuberosa(Vasantharaj et al., 2019), Malvasylvestris(Awwad et al., 2015), aloe vera(Kumar et al., 2015)andGloriosasuperba(Naika et al., 2015). In addition bacterial(Escherichia coli (Singh et al., 2010), Morganellamorganii(Ghasem et al., 20117), Pseudomonas stutzeri(Zarasvand et al., 2016), Gluconacetobacterhansenii(Araújo et al., 2018), fungi (Aspergillusterreus(Mousa et al., 2020), Trichodermaasperellum(Saravanakumar et al., 2019) and actinomycetes biomass have been using for the biogenic synthesis of copper oxide nanoparticles. The plant extract contains both primary and secondary metabolites product of phytocompounds can act as reduce the metal ions to form of nanoparticles. Primary metabolites such as proteins, lipids, carbohydrates (simple sugars and polysaccharides), while secondary phytocompounds comprise flavonoids, alkaloids, terpenes, glycosides, acetogenins and tannins etc. In currently, several researchers have been reported on utilization of naturally derived polysaccharide compounds of gum, pullulan, hydroxypropyl, Arabic, curdlan and pectin for the synthesis of silver or gold or zinc oxide nanoparticles. General biomedical applications of biogenic synthesized copper oxide nanoparticle such as antimicrobial antifungal, anticancer, antibiotics, antioxidants, drug delivery and anti-fouling (Maqbool et al., 2017; Mohammed et al., 2018). In addition, industrial uses gas sensor, thermo sensing, catalytic, magneto resistant materials, synthesis of inorganic nanosize composites, textile industries and environmental remediation (Fatah et al., 2018; Venkatachalam et al., 2018) etc. This review mainly focused on provision scientific findings of biogenic synthesized copper oxide nanoparticles from various biological resources (plants, bacteria, fungi and actinomycetes) and their antibacterial applications.

2. Phytocompounds mediated synthesis of copper oxide nanoparticles

The synthesis of copper oxide nanoparticles have been widely using aqueous plant extracts than compared to the different biological fabrication sources of bacteria, fungi, algae and actenomycetes, but there are some limitation the using of microorganisms for the synthesis of metal and metal oxide nanoparticles (Ijaz et al., 2017). The major problems of microbial mediated synthesis of copper oxide nanoparticles due to their risk of toxicity, isolation and incubation process of the microbial culture as well as large scale production. Hence, the research scientists are mainly focused on plant aqueous extracts are ideal source for the production of copper oxide and other metal oxide nanoparticles. Plant extract contains of phytocompounds can mediated fabrication of copper oxide nanoparticles is an easy and safe, simple process, low energy consumptions, good biological properties and biocompatibility (Awwad et al., 2015). In this technique, the precursor solution is mixed with the plant aqueous extracts, and the reaction takes 2 to 3hrs at incubated room temperature to complete the reaction. The plants have different phytocompounds of secondary metabolic such as flavonoids, terpenoids, tannins, phenols and proteins that act as capping and reducing agents for the conversion of metal salt into the copper oxide nanoparticles (Asemani et al., 2019).

The plant leaf extract of Aloe barbadensis Miller was added to the copper sulfate solution and incubated under the stirring at room temperature for 7hrs. The color change of the solution was visually observed from greenish brown to darkish brown which indicated the formation of copper oxide nanoparticles. The physicochemical characterization of synthesized copper oxide nanoparticles were observed by UV-vis, FTIR, XRD, TEM and SEM with EDX analysis. The surface morphology of copper oxide has revealed spherical with average particles size range of 20nm. The FTIR spectrum of synthesized copper oxide nanoparticles have exhibited the presence of phenolic, terpenoids and proteins compounds that have indicated the responsible for the stabilizing and reducing of formation of nanoparticles (Gunalan et al., 2012). Similar research reported the use of Punicagranatum peel extract for the fabrication of copper oxide nanoparticles. The peel extract was prepared and added into the vessel containing copper salt (copper acetate monohydrate) under the magnetic stirring at 37°C for 10 mint. After that incubation primary identification of the color change was visualized darkish brown which has indicated the formation copper oxide nanoparticles. Synthesized copper oxide nanoparticles were characterized by UV-Vis, FT-IR, XRD and SEM analysis. Surface morphology of the synthesized copper oxide nanoparticles was revealed spherical in shape with an average size of 40 nm. FTIR analysis was determined the presence of bioactive compounds of alcohol, phenol, and amines which responsible for reducing and stabilizing of synthesized copper oxide nanoparticles (Ghidan et al., 2016). The similar research reported by

Table 1.Plant phytocompounds mediated synthesis of copper oxide nanoparticles

using of Oleaeuropaea(Sulaiman et al., 2018)andCitrofortunellamicrocarpa (Rafique  et al., 2018) leaf extract to the synthesis of copper oxide nanoparticle it potential antimicrobial activity of pathogenic bacteria. Recent literature of plant source mediated synthesis of copper oxide nanoparticles are shown in Table1.

2.1. Bacteria mediated biogenic synthesis of copper oxide nanoparticles

In recently, many researchers significantly focus on the bacterial synthesis of nanoparticles, including copper oxide. Bacterial through an intracellular or extracellular protein mediated synthesis of metal oxide nanoparticles have producing wonderful morphologies with nanoscale dimensions Bacterial synthesized nanoparticles have potential biological properties and their antibacterial activity. The advantage of this technique likes an easily cultured, short generation time, high stability, mild experimental condition, easily mutated at the genetic level and high yield of nanoparticles productions (Narayanan et al., 2010). Commonly metal and metal oxide nanoparticles have high toxic concentration, during the nanoparticles synthesis bacterial culture added into that environment condition which converting the toxic metal ions into non-toxic metal oxides. Bacterial oxidative stress has produced several biomolecules that contains of thiol groups (Zarasvand et al., 2016; Kouhkanetal.m, 2020). The bacterial mediated fabrication of copper oxide nanoparticles, these biomolecules act as capping and stabilizing of the nanoparticles. In several scientific reported the biogenic method of bacterial synthesis of different metal and metal oxide nanoparticles such as Au, Ag, Co, Fe, CuO, and CeO respectively. Hassan et al., 2008., have been reported copper oxide nanoparticles synthesis by using of Gram negative bacteria of Serratia sp. The synthesized nanoparticles were physicochemical characterization by using of UV-Vis, FTIR, XRD, XPS and TEM. The FTIR spectrum was confirmed the different functional groups of biomolecules on the surface of bioinspiredcopper oxide nanoparticles. Biomolecules of proteins can act as capping and reducing as well as stabilizing of nanoparticle. The TEM image was revealed polydispersed shaped and average size range between 10-30 nm of the synthesized nanoparticles. Researchers have been recently reported bacteria mediated synthesis of copper oxide nanoparticles are shown in Table 2.

Table 2. Bacteriological mediated synthesis of copper oxide nanoparticles

Other similar research reported, Gram negative bacteria of Morganelamorganii has also been performed the synthesis of copper oxide nanoparticles. Bacteria mediated synthesized nanoparticles have been characterized by XRD, FESEM, XAFS, and EDS. FESEM images were observed surface morphology of copper oxide nanoparticles sh