Bioprocessing, the use of living organisms or their components to produce valuable products, is a cutting-edge field that has revolutionized industries such as pharmaceuticals, food and beverage, and biofuels. No other species has externally harnessed the evolutionary power and complexity of microorganisms. Throughout history, civilizations have harnessed the power of biology to create a wide range of products and processes, laying the groundwork for the modern bioprocessing techniques we use today.

Ancient Times

The origins of bioprocessing can be traced back to ancient civilizations such as Mesopotamia, Egypt, and China, where early humans discovered the beneficial properties of various microorganisms and plants. These early societies practised fermentation, a form of bioprocessing, to produce food and beverages, such as bread, beer, and wine. Fermentation is a natural process where microorganisms break down complex organic compounds into simpler compounds, resulting in the production of alcohol, lactic acid, and other useful compounds. For instance, the ancient Egyptians used yeast, a type of fungus, to ferment grains and produce beer, which was not only a source of sustenance but also had religious and social significance.

A Syrian mercenary drinking beer in the company of his Egyptian wife and child, c. 1350 BC.

In ancient China, bioprocessing was used to create a variety of products. The Chinese were known for their expertise in fermentation techniques, which they used to produce vinegar, soy sauce, and other fermented foods. They also used bioprocessing to create medicinal products, such as herbal remedies and antibiotics, by fermenting various plants and microorganisms. Chinese pharmacists recognized the importance of using natural materials in their medicines, and their knowledge of bioprocessing was passed down through generations.

Another notable example of ancient bioprocessing is the production of cheese. The origins of cheese can be traced back to the Middle East and the Mediterranean region, where ancient societies used the process of curdling milk with the help of microorganisms, such as bacteria and fungi, to create a solid product that could be preserved and consumed over a long period of time. The early cheese-making process involved the use of wooden or clay containers, which allowed microorganisms to colonize and ferment the milk, resulting in the formation of curds and whey.

The ancient Greeks also made significant contributions to the field of bioprocessing. The Greek physician Hippocrates, known as the father of modern medicine, recognized the healing properties of mouldy bread and used it to treat wounds and infections. This was likely due to the presence of penicillin-producing fungi, which are known to have antibacterial properties. This phenomenon would not be identified until almost 2,000 years later by Alexander Fleming.

Alexander Fleming, 1952

Fleming returned to his laboratory after a two-week vacation and found that a petri dish containing Staphylococcus bacteria, which he had left on his workbench, had become contaminated with mould. Upon closer inspection, Fleming noticed that the bacteria surrounding the mould had been killed, while the bacteria further away from the mould were still alive. Fleming identified the mould as a strain of Penicillium and hypothesized that it was producing a substance that killed the bacteria. He named this substance "penicillin."

Middle Ages

Fast-forward to the Middle Ages, and we see the emergence of alchemy, a precursor to modern chemistry, which incorporated bioprocessing techniques. Alchemists used fermentation, distillation, and other bioprocessing methods to create medicinal potions and elixirs, as well as to search for the mythical philosopher's stone, a substance believed to have magical properties.

Artistic impression of Jabir

In the mesmerizing world of alchemy, the renowned 8th-century Muslim alchemist Jabir ibn Hayyan, delved deep into the secrets of the classical elements. With profound insight, he deciphered the nature of fire, which was both scorching hot and arid, while earth stood frozen in its cold and dry essence. Water, on the other hand, was chill and moist, and the air danced with warmth and humidity. Jabir postulated that these four elemental qualities formed the very foundation of every metal, with two of them residing within and two without.

From this visionary premise, a tantalizing theory emerged - that the elusive art of transmutation, the transformation of one metal into another, could be achieved through the alchemical interplay of these elemental qualities. Mediating this mystical process was believed to be a substance known as Xerion in Greek and al-iksir in Arabic, from which the word "elixir" would later be derived. Legends spoke of this enigmatic substance, often described as a dry red powder known as al-kibrit al-ahmar, the red sulphur, crafted from a fabled philosopher's stone.

As the centuries passed, the debate among Muslim chemists raged on, with the illustrious Persian polymath Avicenna, also known as Ibn Sina, challenging the possibility of transmutation. In eloquent prose, he dismissed the notion, declaring that true change in the nature of substances was an elusive feat, mere appearances of transformation could be crafted, but not true transmutation of the essence.

However, whispers of the philosopher's stone persisted, and in the 13th century, the renowned scientist and philosopher Albertus Magnus were said to have unlocked its secrets. Though he did not explicitly confirm this in his writings, he did record witnessing the miraculous creation of gold through the alchemical art of transmutation, a testimony to the wondrous allure of the philosopher's stone.

The Virgin Mary appearing to Albert the Great

In the mystical world of alchemy, where truth and legend intertwine, the pursuit of the philosopher's stone and the elusive transmutation of metals continues to captivate the human imagination with its enigmatic allure.

Renaissance

The advances during the Renaissance brought about the Scientific Revolution and the invention of the microscope. The first sightings of bacteria are attributed to Antonie van Leeuwenhoek, a Dutch scientist who lived in the 17th century. Leeuwenhoek, often referred to as the "Father of Microbiology," was the first to observe bacteria through a simple microscope that he designed and constructed himself. He made ground-breaking discoveries of microorganisms, including bacteria, protozoa, and other microscopic creatures, and documented his observations in detailed letters to the Royal Society of London.

Although his microscopes weren’t much bigger than a modern microscope slide, Anton van Leeuwenhoek coaxed 200x magnification out of his small devices.

Leeuwenhoek's pioneering work in microscopy and his observations of bacteria were instrumental in laying the foundation for the field of microbiology and our understanding of microorganisms, including their role in bioprocessing. His discoveries paved the way for future scientists, including Louis Pasteur and Robert Koch, to further study and elucidate the nature and significance of bacteria for further applications. Leeuwenhoek's observations of bacteria marked a crucial milestone in the history of science, leading to significant advancements in our understanding of the microbial world and its applications in bioprocessing and other areas of science and technology.

Industrial Revolution

Advancements in the sciences brought about marvels industrial revolution of the 18th century. This period began significant advancements in bioprocessing. The discovery of microorganisms by scientists such as Louis Pasteur and Robert Koch led to the development of microbiology, which laid the foundation for modern bioprocessing techniques. Pasteur's work on fermentation and pasteurization, the process of heating liquids to kill harmful microorganisms, revolutionized the food and beverage industry, making it safer and more efficient.

Louis Pasteur in his laboratory, painting by Albert Edelfelt, 1885.

The term “pasteurization” was named after Pasteur himself. The food or beverage is heated to a specific temperature for a predetermined time period, and then rapidly cooled to prevent recontamination. This process effectively destroys harmful microorganisms while preserving the nutritional quality, flavour, and other desirable attributes of the food or beverage.

Pasteur's ground-breaking work on fermentation and pasteurization set ablaze the food and beverage industry, transforming it into a safer, more efficient field. In the 20th century, the world witnessed awe-inspiring leaps in bioprocessing with the discovery of antibiotics, such as the mighty penicillin, forever changing medicine and giving birth to the pharmaceutical industry. Biotechnology emerged as a formidable force, fusing the realms of biology, chemistry, and engineering to craft novel bioprocessing techniques that would shape the future.

Today, and what's next?

Today, bioprocessing stands tall as a thriving, multi-billion-dollar industry, its influence far-reaching and all-encompassing. From pharmaceuticals to biofuels, genetic engineering to synthetic biology, its applications are as diverse as the tapestry of human existence. Genetically modified microorganisms, enzymes, and other biological wonders now weave miracles, producing a vast array of products that touch our lives in countless ways.

Indeed, the rich legacy of traditional knowledge and practices passed down through generations, is a testament to the enduring wisdom of our ancestors —not least in part due to most of human history the existence of bacteria and cells was unknown until the advent of the microscope.

As we forge ahead into the future, pushing the boundaries of what is possible, we must also navigate the ethical considerations that arise. Responsible use of genetic engineering, environmental impact, and the need for regulation and oversight are critical aspects to ensure that the marvels of bioprocessing are harnessed with wisdom and prudence.

Bioprocessing has come a long way from its ancient roots, reaching back to the ingenuity and resourcefulness of ancient civilizations. but it is worth noting that many of the principles and techniques used in modern bioprocessing have their origins in ancient civilizations. The early humans who practised fermentation to produce food and beverages, the ancient Chinese who harnessed the power of microorganisms to create medicinal products, and the alchemists who used bioprocessing methods in their quest for the philosopher's stone, all contributed to the development of bioprocessing as we know it today.

In conclusion, the saga of bioprocessing is a saga of marvels and breakthroughs, of ancient wisdom and modern wonders. It is a tale of relentless progress, of a field that has transformed industries and continues to shape our world. Today, bioprocessing is a cutting-edge field that continues to shape the future of medicine, agriculture, energy, and more. Let us cherish the wisdom of the past, embrace the innovations of the present, and approach the future of bioprocessing with ethical mindfulness, as we unravel the mysteries of life's intricate tapestry with unwavering curiosity and reverence.

The future of bioprocessing is expected to be characterized by increased automation, continuous processing, single-use systems, advanced analytics, gene editing and cell engineering, sustainability, and personalized medicine, leading to more efficient and sustainable processes with improved product quality.

I hope to lead this future by introducing methods of monitoring bioreactors for upstream and downstream processes using Raman spectroscopy. The basic premise is to shine a laser within the bioreactor and detect changes in the bioreactor as the biological product is being created.