Dr Sarita M. Adhikari and the green chemistry of biodegradable plastics

Plastic pollution is often presented as a problem that can be solved by replacing every conventional product with a biodegradable alternative. Dr Sarita M. Adhikari’s research focus invites a more careful view. Green chemistry asks how materials are designed, manufactured, used and managed at the end of their lives, rather than judging a product by its label alone.

For Nepali chemists, this field connects laboratory science with urgent environmental questions. Agricultural residues, plant-based polymers and safer chemical processes may offer useful alternatives to fossil-derived plastics, while also creating research opportunities suited to local resources and community needs.

The subject is equally relevant in Australia. Shoppers in Sydney, Melbourne and Brisbane have become familiar with state-based restrictions on lightweight shopping bags, yet food packaging, takeaway containers and soft plastics remain difficult waste streams. A material described as compostable may require a commercial organics facility that is unavailable in a particular council area.

This makes a researcher such as Dr Adhikari important to the wider chemistry community. Her work can be understood through a central question: can a plastic perform its intended function while requiring fewer hazardous substances, less energy and a clearer end-of-life pathway?

What green chemistry changes

Traditional materials development often prioritises strength, flexibility, shelf life and low cost. Green chemistry adds other design targets, including renewable feedstocks, reduced toxicity, efficient reactions and materials that break down into less harmful substances under defined conditions.

Biodegradable plastics can be made from polymers such as polylactic acid, polyhydroxyalkanoates and starch-based blends. Their environmental performance depends on molecular structure, additives, thickness, moisture and temperature. A polymer that degrades in an industrial composting system may persist for much longer in a backyard compost bin, landfill or marine environment.

Dr Adhikari’s research theme is therefore valuable because it links organic chemistry with analytical testing. Researchers must examine not only whether a material loses mass, but also whether it fragments, releases harmful compounds or fully converts into carbon dioxide, water, biomass and other expected products.

From Nepali resources to practical materials

Nepal has a strong basis for exploring bio-based materials. Agricultural by-products, plant fibres and starch-rich resources can serve as starting points for films, coatings and polymer blends. Turning these resources into reliable materials requires careful control of composition, moisture sensitivity, mechanical strength and microbial degradation.

A green synthesis route should also be assessed across its full process. Solvents, catalysts, heating requirements and purification steps can determine whether a supposedly sustainable plastic has a genuinely lower environmental burden. Using a renewable feedstock is not enough if the production method generates substantial waste or relies on hazardous reagents.

This systems perspective creates useful connections between Nepali laboratories and international research groups. Students can investigate local materials while applying globally recognised methods such as spectroscopy, thermal analysis, tensile testing and controlled biodegradation studies.

Why biodegradability needs evidence

The words biodegradable, compostable and bio-based are often treated as interchangeable, although they describe different properties. Bio-based refers to the origin of a material. Biodegradable describes biological breakdown under particular conditions. Compostable usually implies that the material meets defined requirements for disintegration and ecological safety within a specified composting process.

Australian consumers encounter this distinction through council waste instructions and packaging claims. A compostable coffee lid placed in a general recycling bin can contaminate the recycling stream, while a certified item may still have no suitable collection route in regional areas. Standards such as AS 4736 and AS 5810 help define compostability for industrial and home composting contexts, but access to the necessary infrastructure remains uneven.

For researchers, this means every claim should be supported by test conditions. Measurements of mass loss, carbon conversion, visual fragmentation and ecotoxicity should be reported with temperature, humidity, microbial conditions and time. Such transparency is more useful than a broad claim that a plastic simply “disappears”.

Connecting laboratories with the Australian market

The Australian market shows why performance and disposal must be considered together. Supermarket packaging from Coles and Woolworths may need to protect fresh food through long supply chains, while hospitality businesses in Melbourne or Sydney need containers that tolerate hot meals, grease and transport. A material that degrades rapidly may fail if it becomes soft during use.

Local purchasing habits also shape research priorities. Australians commonly use reusable shopping bags, takeaway cups and household compost systems, while container deposit schemes operate in states including New South Wales and Queensland. These systems encourage material recovery, but they do not automatically solve the problem of flexible films or certified compostable packaging.

Green chemistry can help by designing materials for a known collection pathway. A successful product might use fewer additives, separate cleanly from food waste and carry clear disposal instructions. Research inspired by Dr Adhikari’s work should therefore include manufacturers, waste managers, councils and consumers alongside chemists.

Building a community of careful chemistry

A researcher feature has value beyond celebrating an individual scientist. It gives students a model for connecting molecular structure with public health, resource use and environmental policy. For Nepali students studying in Australia, this field can also create a bridge between university laboratories, community projects and industry placements.

Accessible communication matters because scientific terms are easily turned into marketing language. NepaChem’s broader outreach includes public discussions of probability and risk, such as a Sic Bo triple bet, showing why readers benefit when claims are explained rather than accepted at face value. The same principle applies to biodegradable plastics: evidence, conditions and uncertainty should remain visible.

Dr Adhikari’s green chemistry perspective ultimately encourages practical ambition. Researchers can seek polymers that use renewable inputs, safer reactions and realistic end-of-life systems, while recognising that no single material will solve plastic pollution everywhere.

A useful next step is to compare one biodegradable packaging product sold in Australia with its disposal instructions, certification details and available local waste pathway before treating its environmental claim as proven.