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Introduction

Plastic materials are used almost everywhere from ordinary polythene bag to biomedical fields. Although plastic is a major environmental pollutant¹in the environment. Petroleum derived plastics accumulation²is a major cause of pollution for the environment and its adverse effect destroying the balance in the eco system. So it is a novel approach to produce plastic using microbes and bioplastic³is the answer of this problem. These biopolymers can break down into biomass, water and carbon dioxide either aerobically⁴or anaerobically. Disposable properties and eco-friendly properties of biopolymers make them so special over conventional plastics. This review paper provides information how biolastics can be an alternatives to petrolium based plastics for the sustainable development and the undergoing progress that India has made in this field.

What is Bioplastics

Bioplastics are produced from biomass like polysaccharides, lipids, proteins, etc. If a plastic material is either biobase or biodegradable or have both biobase and biodegradable property can be termed as bioplastic. The three different categories of bioplastics are depicted in Figure 1.

Biodegradation: In this process plastic degrade into biomass, water and carbon dioxide; in presence of air, moisture and microbes. The degradation process is thickness and composition⁵dependent.

Degradation: It is an abiotic degradation process where fragmentation initiated by UV light, oxygen attack, and biological attack. Polyethylene breaks down in this process.

Bio-based plastics:These plastics are recyclable but may or may not be biodegradable. Bio-based plastics are mainly derived from natural resources. Bio- PVC, bio- PE are the example of bio-based plastic. Sugarcane⁶is the resource of the these polymers.

Compostable plastics:These plastics cannot fully degrade on their own; compost site needed for the break down process. These plastics are eco friendly than petroleum based plastics as less toxic substance released after the degradation process.Enzymatic degradation process may also takes place. PLA is suitable for both methods to degrading completely.⁵

Conventional plastics:Plastic derived from non-renewable resources are the conventional plastics.

Figure 1:Different bioplastics.3(PE: Polyethelene, PP: Polypropylene, PET: Polyethelene terephthalate, PA: Polyamide, PTT: Polytrimethylene terephthalate, PLA: Polylactic acid, PHA: Polyhydroxyalkanoates, PBS: Polybutylene succinate, PBAT: Polybutylene adipate, PCL: Polycaprolactone Click here to view Figure

Bioplastics and Conventional plastics

Researchers are involved to invent easier methods for bioplastic synthesis. Disposable properties and eco-friendly properties of biopolymers make them so special over conventional plastics. (Table 1)

Table 1: Comparison of conventional plastics and Bioplastics

Conventional Plastics	Bioplastics
Mainly Chemicals	Generally Microbes
High Green House Gas emission	Low Green House Gas emission
Non bio degardable, harmful	Bio degardable, harmless
Recycling and destroying process is difficult	Recycling and destroying process is less difficult
Low production cost	High production cost

Biodegradation⁷is the process where polymers break down into biomass, water and carbon dioxide; in presence of air, moisture and microbes. The complete process is called mineralization. Temperature plays a crucial role in this conversion process.

Bioplastic and Social Benefits

Use of petroleum based plastic increasing the pollution level, so we have to find an alternative and ‘Bioplastic’ is the answer. Bioplastics has both advantages and disadvantages. Lower carbon footprint, energy efficiency, and eco-safety are some of the advantages. On the other hand, high cost, recycling, reducing raw material, misuse and lack of legislation should be mentioned as weakness. It should be mentioned that in order to eliminate these disadvantages and have a more sustainable market and industry, better recycling system, restrict legislation, and standardization and management should be applied.

Bioplastic and Market

Bioplastics is going to dominate the plastics industry in coming days. Bioplastics mainly used in packaging industry although potential application in automotive and electronics sector⁸is well established. Bioplastics also play an important role in developing bioeconomy.⁹Developing countries like in India use of bioplastics will create new the job opportunity.

Selection of plastics depends on several tools, “plastic spectrum” (Figure 2) helps us to find right one. In this spectrum, bio-based bioplastics are most preferable as they are at the right of the pyramid and are made from renewable resources.

Biodegradable bioplastics have been found to have potential application in different field. One of the pioneer applications has been found in delivering drugs and tissue

Figure 2: Plastic spectrum in accordance with the data.10 Click here to view Figure

PVC: polyvinyl chloride; PU: polyurethane; PS: polystyrene; ABS: acrylonitrile butadiene styrene; PC: polycarbonate; PET: polyethylene terephthalate; PE: polyethylene; PP: polypropylene

engineering scaffolds.¹¹Integration of these materials into their technologies has been developing worldwide. Bioplastics market is a growing market¹²and it increases about 20%~25% per year globally and by 2020 it will increase to 25%~30% of total plastic market . According to Figure 2, the bioplastics at the right are the most preferable as they are biodegradable and also compostable.¹³

Bioplastics and India¹⁴

Bioplastics market in India is in infant stage. Very few companies are operating in the bioplastic segment in India. Environmental awareness programs, easy availability of feedstock and government backing giving major support to Bioplastics manufacturers in India. More initiative needed for production, raw materials and technology development. Environmental awareness and promoting the long-term benefits of bio-plastics is an initial step that needs to take toward bringing this change. The National Green Tribunal's state-level committee has set August 31, 2019 deadline for the government to enforce the ban on plastic.
Scientists across the India working for the development of bioplastics. Very recent development¹⁵came from IIT-Gwahati and the new bioplastic is under commercial production. Biogreen India’s 1st Biotechnology Company¹⁶for Biodegradable Products. Truegreen, Plastobags, Ecolife, Envigreen these companies are already producing bioplastics in India. Many technological discoveries have boosted Indian Bioplastics market and significant growth¹⁷in industry has been observed. It is up to every individual to stop the use of conventional plastics in their daily life as much as possible.

Conclusion

Plastics in different size accumulated in environment and take long time to break down. Microplastics, which comes after breaks down of plastic, is of size less than 5 nm in diameter, are bioavailable to organism through food chain, are dangerous to health. Whereas bioplastic end up with biodegradable or compostable materials which on treatment may give biofuels. Environmental as well as economic issues are addressed by bioplastics. Thus bioplastic is a developing field of research for sustainable development.

Acknowledgement

I am thankful to my departmental colleague, editor of the journal and reviewers for their constructive suggestions during the manuscript preparation.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Conflict of Interest

The authors do not have any conflict of interest.

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