For centuries, alchemists sought to transform ordinary matter into something more valuable. Their ambitions were genuine, driven by the belief that ordinary materials could be converted into something of far greater worth. The underlying desire — to unlock hidden potential within natural materials — remains deeply relevant. Today, a modern form of “alchemy” is emerging in sustainable materials science, driven not by mysticism but by precise, low impact chemistry. At the centre of this shift is mechanochemistry, a technique that uses mechanical force rather than heat or solvents to drive chemical reactions. When applied to agricultural residues such as berry waste, mechanochemistry offers a green pathway to produce high performance bio based polyesters with a significantly reduced environmental footprint.
An Old Concept with Renewed Relevance
Although mechanochemistry may sound novel, its roots extend far back. Early civilisations used mechanical grinding to prepare pigments, medicines and metal alloys. Over time, however, solvent‑based chemistry became dominant, offering scalability and control that early mechanochemical methods could not yet match. Today priorities have shifted. As industry seek to reduce waste, energy consumption and reliance on fossil‑derived feedstocks, mechanochemistry has re‑emerged as a compelling alternative. Its advantages — minimal solvent use, lower energy requirement and compatibility with renewable biomass — align closely with contemporary greener goals.
Mechanochemistry: Chemistry Driven by Motion
Mechanochemistry relies on physical motion — grinding, milling, or shearing — to initiate and accelerate chemical transformations. In a mechanochemical reactor, particles collide with enough energy to disrupt rigid natural structures, expose reactive functional groups, and enable new bond‑forming reactions. This stands in contrast to conventional synthesis, which typically depends on high temperatures, long reaction times, and substantial solvent use. Mechanochemistry is, by comparison, efficient, selective and inherently cleaner.
Why Berry Waste?
ECOSYSTEM is partnering with MBP (Mountain Berries Pitsilia NV LTD, a farming company in Cyprus) focused on the sustainable production of berries. Berry processing generates substantial quantities of residual biomass — skins, seeds, stems, and pulp. These materials contain complex aromatic and polyphenolic structures — the ring-shaped aromatic molecules responsible for colour, flavour and antioxidant activity — that, with the right treatment, can serve as valuable chemical building blocks. Traditionally, extracting these molecules requires harsh processing conditions. In practice, this means exposing biomass to high temperatures, strong acidic or alkaline solutions, and large volumes of organic solvents. These methods can be effective, but they generate considerable chemical waste, demand significant energy and often degrade the very compounds researchers aim to recover. Mechanochemistry offers a greener way, enabling the controlled breakdown of berry waste into small reactive building blocks — monomers — suitable for polymerisation, the process of linking small molecules into long, repeating chains.
From Biomass to High‑Performance Polyesters
Once isolated, the berry‑derived monomers can be polymerised into molecular chains that form advanced bio‑based polyesters, the same class of materials used in many everyday plastics and fibres. These materials can be engineered to meet demanding performance criteria: mechanical strength, thermal stability, barrier properties — the ability to keep oxygen, moisture or aromas from passing through — potential biodegradability and compatibility with recycling processes. This positions them as credible alternatives to conventional fossil‑based plastics, particularly in sectors such as agriculture, food- and packaging and pharmaceuticals.
A Broader Impact: Why It Matters
For researchers, mechanochemistry is an ancient practice opening new avenues for biomass valorisation — turning low‑value plant residues into useful products — and solvent‑free synthesis. For industry, it offers a route to high‑performance materials with a significantly lower environmental footprint. And for consumers, it represents a future in which everyday products may be derived from renewable agricultural residues, reducing reliance on fossil‑based resources such as petroleum. So, mechanochemistry does not promise literal gold, but it offers something of broader value: the valorisation of waste, cleaner production processes and high‑quality materials. In the end, perhaps the real question is not whether we can turn waste into gold — but whether we can choose green over gold.