Heat Treatment in Food Preservation: Historical Development and Microbial Inactivation

The destruction of microorganisms by heat is fundamentally due to the inactivation of enzymes necessary for their metabolism. Enzymes, being proteins, are sensitive to temperature changes; high heat denatures these proteins, rendering them non-functional. This process effectively kills or deactivates the microorganisms, ensuring food safety and preservation.

The choice of heat treatment in food preservation depends on various factors, including the type of microorganism, additional preservatives used, and the impact on the food's quality. Different microorganisms have varying heat resistances; for instance, spores of certain bacteria require higher temperatures for inactivation. The presence of other preservatives, such as acids or salts, can enhance the effectiveness of heat treatment, potentially allowing for lower temperatures or shorter processing times. However, these treatments must balance microbial destruction with maintaining the food's nutritional and sensory qualities.

The modern food preservation process has its roots in early 19th-century France. Nicolas Appert, known as the "father of canning," pioneered the technique of preserving foods by sealing them in glass jars and boiling them. This innovation earned him a prize of 12,000 French francs from the French government in recognition of his method's potential to preserve food safely for extended periods.

In 1819, William Underwood established the first canning factory in Baltimore, USA, marking the beginning of the commercial canning industry. However, the initial method of boiling water required approximately six hours to preserve foods, which was inefficient. The addition of salt to the water bath raised the boiling temperature, reducing the processing time but causing corrosion to the cans. This challenge led to the development of heating in steam under pressure, a method that significantly shortened processing times and enhanced efficiency. These early pressure chambers have since evolved into modern retort systems, which are standard in the industry today.

In 1945, researchers investigated the effects of heating the germ at various moisture levels and durations in a hot air oven on enzyme activities and storage stability at 37°C in laminated metal foil. Their studies revealed that all heat treatments completely destroyed lipoxidase activity, while proteolytic activities were significantly reduced, contingent on moisture levels. Surprisingly, raw germ samples exhibited a smaller increase in peroxides compared to heat-treated samples, highlighting the nuanced effects of heat treatment on food preservation. This research contributed to the optimization of heat treatment processes, ensuring both food safety and quality.
Heat Treatment in Food Preservation: Historical Development and Microbial Inactivation

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History of Modern Food Flavor

The evolution of modern food flavor embodies a saga of innovation, scientific inquiry, and industrial advancement. Its roots can be traced back to the 16th and 17th centuries when pharmacies pioneered the distillation of essential oils, which now play pivotal roles in perfumes and flavorings. However, it wasn't until the latter stages of the 19th century that the full potential of synthetic aromatic chemicals in flavor enhancement became apparent.

In 1858, a significant breakthrough occurred with the crystallization of vanilla from an alcoholic extract, courtesy of Gobley. This landmark discovery served as a catalyst for further exploration, leading to the synthesis of methyl salicylates in 1859, recognized as 'artificial wintergreen oil,' and benzaldehyde in 1870, esteemed as 'artificial butter almond oil,' prized for their fruity fragrances.

The empirical formula of vanilla was elucidated in 1872 by Charles, and its structural composition was unveiled by Tieman and Haarman two years later. This pivotal moment laid the groundwork for industrial-scale production, with Haarman and Reimer spearheading the inaugural large-scale manufacturing of vanillin. Concurrently, organic chemists embarked on synthesizing diverse aromatic compounds, thereby broadening the spectrum of flavors accessible to the industry.

The emergence of the flavor industry coincided with the surge in large-scale processed food manufacturing during the mid-19th century. Germany's chemical sector assumed a leadership role in flavor production during the early 20th century, showcasing esters for artificial fruit essences at a prestigious London trade fair, subsequently finding widespread adoption in the United States.

The dissemination of knowledge played a pivotal role, exemplified by the anonymous publication of the first compendium of artificial flavoring formulations in Philadelphia in 1869. Additionally, in 1916, Walters' seminal manual for the essence industry imparted invaluable insights, propelling advancements in flavor production.

The late 1950s to early 1960s witnessed pivotal breakthroughs in raspberry and strawberry flavors, underscoring the industry's relentless pursuit of innovation. Presently, multinational flavor and fragrance conglomerates dominate the sector, prioritizing the synthesis of both natural products and synthetic chemicals to craft an extensive spectrum of flavorings and fragrances.

In conclusion, the narrative of modern food flavor epitomizes human ingenuity and scientific advancement. From the early experimentation with essential oil distillation to the intricate synthesis of complex aromatic compounds, each milestone has contributed to the rich tapestry of flavors available to consumers today.
History of Modern Food Flavor

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History of Food Flavor Before the 18th Century

The history of the food flavor industry before the 18th century is a fascinating journey marked by ancient practices and evolving techniques that laid the foundation for modern culinary experiences.

Flavorings, integral to culinary arts, trace back to antiquity with roots entrenched in Greek and Latin terminology, reflecting an early understanding of sensory perception and taste. This linguistic heritage underscores the significance of flavor in human culture.

The genesis of flavor enhancement can be traced to the discovery that the aromatic essence of natural products could be intensified through rudimentary methods. This revelation, likely born out of experimentation and observation, heralded the dawn of intentional flavor manipulation.

The utilization of spices and herbs, dating back some 5000 years to ancient Egypt, showcases early human endeavors to enhance food flavor. These ingredients not only added taste but also served diverse functions throughout history, ranging from culinary enhancement to medicinal properties.

The 13th century marked a pivotal moment in the systematic development of flavoring techniques. Pharmacies emerged as centers of innovation, pioneering the preparation of remedy oils that laid the groundwork for modern flavor extraction methods. Pharmacopeias of the era meticulously documented the properties and physiological effects of these oils, fostering a scientific approach to flavor exploration.

The Renaissance period witnessed a significant leap forward in flavor extraction technology. Essential oils, crucial components in both perfumery and flavoring, were refined through distillation techniques pioneered by pharmacies. This era saw the transformation of ancient practices into sophisticated processes, laying the groundwork for the burgeoning flavor industry of the future.

The 16th and 17th centuries marked a golden age for the flavor industry, as essential oils produced by pharmacies became prized commodities. These oils, initially intended for medicinal purposes, found new applications in perfumery and gastronomy, shaping the sensory landscape of the era.

In conclusion, the history of the food flavor industry before the 18th century is a testament to human ingenuity and innovation. From ancient practices to Renaissance refinement, each era contributed to the rich tapestry of flavors that define culinary experiences to this day.
History of Food Flavor Before the 18th Century

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Food Additives Regulation History

The historical use of additives in food processing dates back to ancient civilizations, with practices such as preserving meat with salt and using smoke as a preservative representing early forms of food additives. These additives have significantly influenced our dietary habits, taste preferences, and socio-cultural development over time.

The regulation of food additives began in the 19th century in Britain, prompted by the efforts of Frederick Accum and aimed at preventing food adulteration.

In the United States, the Food and Drug Administration (FDA) oversees the regulation of food ingredients. The requirement for registering and testing additives before submission to the FDA was established in 1958, replacing the previous internal testing conducted by the FDA. The introduction of the Generally Recognized as Safe (GRAS) list recognized substances long deemed safe by scientists, exempting them from premarket clearance.

The GRAS list underwent revision in 1969 and, by 1980, included 415 substances from the 1958 project. Currently, manufacturers must demonstrate and provide evidence for their GRAS status, with approximately 100 new substances seeking GRAS certification annually.

The Delaney Act, an amendment within the 1958 law, prohibited additives associated with cancer. In 2003, the FDA introduced a "no residue" clause, allowing approval for animal feed additives or drugs inducing cancer only if no residue is found after slaughter. Critics argue the unenforceability of the Delaney Act, while the FDA maintains that the risk to consumers is minimal in cases of a slight carcinogen presence in meat or milk.
Food Additives Regulation History

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Thyme (Thymus vulgaris L.): History and Uses

The common designation for Thyme may have its roots in a Greek term associated with fumigation, reflecting its historical role as incense, or it might be connected to the Greek term "thymon," which signifies courage.

Plants of the Thymus genus, highly esteemed for their essential oils referred to as Thyme oil, play a significant role in the medical field due to their varied therapeutic properties.

Thyme had medicinal uses in ancient Sumerian and Egyptian societies, employed for embalming and medicinal purposes. Romans used thyme to deter dangerous animals, enhance the flavor of cheese and alcoholic beverages, and believed that bathing in thyme conferred strength.

Beyond its popularity as a culinary spice, Thyme leaves have applications in cosmetics and medicine, recognized for their flavoring and deodorizing attributes. The distinctive aroma of the essential oil primarily stems from phenolic monoterpenes like thymol and carvacrol.

Thyme is abundant in flavonoids and phenolic antioxidants, such as zeaxanthin, lutein, pigenin, naringenin, luteolin, and thymonin. The herb boasts elevated antioxidant levels, along with vital minerals and vitamins essential for overall health.

Thyme's essential oils encompass thymol, a component found in antiseptic mouthwashes. The essential oil consists of various compounds, including oxygenated monoterpenes, monoterpene hydrocarbons, sesquiterpene hydrocarbons, thymol, carvacrol, γ-terpinene, and p-cymene.

In present-day applications, thyme oil is extensively utilized in the manufacture of soaps, cosmetics, mouthwash, and toothpaste. Red thyme oil is employed in the production of perfumes.
Thyme (Thymus vulgaris L.): History and Uses

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Dark lagers

The two basic types of beers are ales and lagers. ale yeasts prefer warmer temperatures and are considered “top fermenting” based on the location of the fermentation activity in a fermentation tank.

Lager is the most common type of beer in the world. The bottom-fermented techniques used to brew it result in a crisp, refreshing beer, though it's a surprisingly diverse group. Lagers utilize yeast that work at cooler temperatures.

Both ales and lagers can be light or dark. The color of beer comes from the different levels of toasting or malting on the grains used to brew the beer.

In the late nineteenth century, German brewers started brewing the Marzen, or Oktoberfest style of beer which quickly became more popular than the Vienna Lager. At one time, all beer would have been dark and rather murky because of an incomplete understanding of the process of making beer and primitive kilning technology.

German brewers also created a dark, rich lager known as the Munich Dunkel which is still popular in Bavaria and through many parts of the world today. In German, Dunkel is German for "dark" and it's a classic pub beer from Bavaria, specifically the Munich area. Some form of Dunkel was probably first brewed by the Benedictine monks’ who established the settlement of Munich in the middle of the 12th century,

The original lager style, it's made with dark roasted malts with a red-tinted color from amber to mahogany. Munich Dunkels are typically dark brown beers that are heavy on malt flavors (sweet), in part because of the moderately carbonate water in the Munich area. Dark lagers range in color from dark brown to black and range in alcohol from 4.5-5.5%.

The color in beer is imparted by the malt bill—and in the case of certain recipes, additives like fruits, spices, and other random ingredients—and has nothing to do with the yeast being used.

Their malty richness and pleasant, sweet flavors also tend to pair well with a variety of foods. Most of them are also strong enough in flavor to stand up to spicy dishes, barbecue and other flavorful foods.
Dark lagers

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Bread product of bagel

A bagel is a round yeast roll with a hole in the middle. A true bagel is completely plain and is made with white wheat high gluten flour, then boiled in water and then baked, which gives the bagel its characteristics hard, glazed crust.

The name bagel comes from the German word beugel meaning a round loaf of bread. The first mention of the bagel was in 161 in Kraków, Poland, when it was mentioned in a piece of literature that it would be given to women in childbirth. Jews from central Asia, where similar type of ring bread still exist, might have brought the concept to eastern Europe during the Middle Ages.

Bagels are mostly steamed and are offered in every conceivable flavor, from the more traditional pumpernickel or onion to the sweetened blueberry or chocolate chip versions, as well as many other flavors in between.

The largest bagel ever made was on July 23, 1998 in Mattoon, Illinois. It was blueberry bagel and weighed in at 714 pounds.
Bread product of bagel

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The development of sweeteners

Humans have had a ‘sweet tooth’ for thousands of years.  Ancient documents make clear reference to the use of honey as a sweetening agent. Before the introduction of sugar, sweet stuff was so scarce that most people ate none at all, except perhaps in an occasional piece of fruit or spoonful of honey.

Sucrose or table sugar became available only about a thousand years ago and has been the primary sweetener worldwide for most of the twentieth century.

Sugar came to Europe at the time of Crusades, but as it was expensive, only the most privileged members of society enjoyed. The first large-scale sweetener, sugar cane, was brought to the West from the Indian sub-continent first by Persian and Greek merchants and explorers before the Christian period.

England was soon the largest sugar-consuming country in the world, with annual per-capita consumption reaching four pounds in 1704, eighteen pounds in 1800 and ninety ponds in 1900.

An early effort at creating a fructose sweetener was patented in 1935. This process relied on extraction of fructose from plants including Jerusalem artichoke, dahlias, chicory, and beet sugar molasses.

In addition, recent technological advances in food producing have allowed for the ‘invention’ of another sweetening agent – corn syrup and high-fructose corn syrups (HFCS).

Corn was first used as a sweetener when scientist began to extract glucose from corn. Glucose is an sugar abundant in plants an a primary product of photosynthesis, though less sweet than sucrose or fructose, an important sugar found in fruits such as grapes, peaches plums, cherries and many more.  Corn syrup is a sweet, viscous liquid made from cornstarch.

The development of HFCS and their introduction into the food supply is a good example of modern technology being applied to the benefit of society.
The development of sweeteners 

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Leavened bread

Bread a food prepared from the meal or flour of the cerealia, by kneading it together with water into dough, and exposing it to the action of heat or baking it.

There are two principal kinds of bread fermented or leavened and unfermented or unleavened. Wheat flour is ideal for leavened bread because wheat contains gluten, a protein that becomes sticky when mixed with water.

For the fermented or leavened bread the dough is first made to undergo a kind of fermentation by the addition of leaven or dough, which is already in a fermenting state or of yeasts.

Legend has it that leavening was discovered by an Egyptian baker who set some wheaten dough aside in a warm place. The dough, having been contaminated with wild yeast and/or bacteria, rose significantly as the microorganism grew and multiplied.

It is common in dirt and floats unseen in air. There are many varieties of yeast, some better suited to baking some to brewing.

No doubt, the person who sampled the accidentally leavened dough after baking was favorably impressed with its light airy texture.

The ancient Hebrews learned how to make leavened bread from the Egyptian in 1300 BC.

As a staple of the standard American diet, leavened bread is prepared with yeasts or baking soda to make the dough rise before baking.
Leavened bread

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Early food flavor before 19th century

In 1492 Christopher Columbus set sail to find seasoning. Today the influence of flavor in the world market place is no loess decisive. The rise and fall of corporate empires – of soft drinks companies, snack food companies and fast food chains - is frequently determined by how their products taste.

During the early days of history, people used mainly herbs and spices (whole or ground) to impart flavor to , or modify the flavor of, foods. It is to make food more appetizing, first by using spices and herbs and then by the extraction of fruits and aromatic plants during Middle Ages or distillation of essential oils.

The latter were predominantly used by pharmacists, and it was not until the 19th century that some people found out that essential oils can be used to impart flavor to foods.

It is believed that people began the practice of adding flavor to foods by marinating or soaking them in seasoned and salted liquid between the mid-1600s and the mid–1700s.

In the second half of the 19th century, chemists began to realize the flavoring potential of some synthetic chemicals e.g. vanillin.

Wohler and Liebig synthesized benzaldehyde in 1830 and this substance was identified in 1932 by Robiquet an Boutron-Charlard to be responsible for the odor of bitter almonds.

Thus was born the flavor industry around the middles of the 19th century.
Early food flavor before 19th century

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History of Sugar

History of Sugar
Sugarcane cultivation and sugar refining were practiced in India, Arabia and the Mediterranean in the Middle Ages, apparently spread from a point of origin in northeastern India though the Muslim world.

By the time of the discovery of the Americas in the late 15th century, sugarcane cultivation had already spread to the Canary Islands.

Columbus and other early explorers of the Caribbean recognized that the climate weather was ideal for sugarcane cultivation and Columbus brought the first sugarcane from the Canary Islands to Santo Domingo in 1493.

The first sugar mill in the Western Hemisphere was built there in 1509, and by 1511, sugarcane was being harvested in Cuba. It spread rapidly to the other islands and to Mexico and Brazil.

The estates granted to Hernan Cortes in Mexico after his conquest there in 1524 were largely devoted to sugarcane production.

The Africa slaves trade stimulated a need for products that the European could barter for slaves in Africa which included distilled spirits.

Rum could be made from molasses, one of the by products of the sugar refining process.

The sugar and rums became essential parts of the triangular trades that brought millions of Africans to the New World over the 300 years from about 1520 to about 1820. Since reducing the sugarcane to raw sugar and molasses required a heating process the island regions were soon denuded of firewood.

Planters would crush the sugarcane to separate the fibers in heavy roller mills usually powered by draft animals or slaves.

The crush cane would be rinsed repeatedly with water to extract the sugar juices. After the exhaustion of firewood, planters used the fibrous remains of the canes, called bagasse, as fuel for the crude boiling pits to crystallize the raw sugar.

By the 1600s, the refining process had been separated from the plantations. Raw sugar was shipped to refineries in Lisbon Marseilles, London and Amsterdam and later to New York and other cities in colonies North America.

The history traced that the industrialization to Europe and the northern American colonies to the place in the sugar induced triangular trade and the reduction of the Caribbean region to a plantation economy based on cheap labor to the same factor.

When France became isolated from its sugarcane colonies following the French revolution, the loss of Haiti (the French part of the island of Santo Domingo) to a slave-led revolution led the French to begin sugar beet production.

The process of refining sugar from beets had been develop in about 1750 by German chemist Andreas Margraf.

A small sugarcane plantation economy developed in Louisiana Territory between 1750 and 1800 and remained in place after the purchase of that territory by the United States in 1803.
History of Sugar

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Legal Background History of Food Additives

Legal Background History of Food Additives
As with many other elements used in food processing, additives originate very early in human history, For example, people learned in prehistoric times that adding salt to meat would preserve it.

Likewise, smoke which also acts as a preservative might considered an early food additive. Overtime, additives have come to thoroughly influence our eating habits, our taste preferences, and our socio-cultural development.

The earliest legislation controlling the use of food additives took place in Britain in the 19th century, following the work of Frederick Accum, though its original impetus was the prevention of food adulteration.

In the United States, the Food and Drug Administration (FDA) oversees the regulation of ingredients that can be added to food.

It was not until 1958 that registration was adopted requiring food and chemical manufacturers to test their additives before they were submitted to the FDA.

Before the law, the FDA itself was responsible for testing the submitted additive. Thereafter, Congress established a Generally Recognized as Safe (GRAS) list.

This list recognized that many substances that had been added to food for along time were commonly seen as safe by qualified scientists, which exempted them from premarket clearance.

This list was revised in 1969 and as of 1980 contained 415 substances that were originally included in the 1958 project. Today, manufacturers are responsible for demonstrating their GRAS status and providing evidence (such as scientific literature) to support it.

Approximately 100 new substances are presented to the FDA for GRAS certification every year.

Also included in 1958 law was an amendment called the Delaney Act; it stipulated that “no additives may be permitted in any amount of the tests show that it produces cancer when fed to man or animals by other appropriate test.”

Many manufacturers, as well as some FDA commissioners, have criticized this amendment as being unenforceable.

Instead, in 2003, the FDA adopted a “no residue” clause; this clause provided that the FDA could approve an animal feed additive or drug that induces cancer if there is “no residue” of the additive found after slaughter.

The FDA maintains that the risk is slight or nonexistence of humans consume meat or drink milk from an animal with a minuscule amount of a carcinogen present.
History of Food Additives and History of Legal Background

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History of Food Additive

History of Food Additive
Before the Civil War, people raised most of what they ate and processed it themselves and food additives were limited mostly to home grown colorings and substances needed for preservation in storage vegetable and fruit juices, salt, spices, smoke.

Our system of food supply changed after the Civil War. Thousands of rural people flocked to the cities to work in factories, they now needed food grown and preserved by someone else. Manufacturers of food products sprang up almost everywhere.

Food purity as such was not a major consideration. Cheap and handy methods of preserving foods were important to profits and scientific knowledge of food chemistry was practically nonexistent.

Dangerous adulteration of foods was commonplace. Chemicals to keep products looking good until they reached the consumer or just to hide the small and look of spoilage were used without much restraint.

The problem of food additives became acute. Supplying the rapid growing urban population required constantly expanding facilities and speed of production took precedence over both quaintly and safety.

For example, copper sulphate, a powerful emetic also known as blue vitriol, was added to canned vegetables to give them that fresh, green look; and salicylic acid, borax and formaldehyde were used generously - and carelessly.

Food and drug protection became an operating function of the Federal Government under the strong leadership of one man. Dr. Harvey Washington Wiley, chief chemist for the US Department of Agriculture in Washington DC, announced publicly that the American people were being steadily poisoned by the dangerous chemicals that were being added to food with reckless abandon.

To dramatize the problem and to learn more about the reactions of the human body to ingestion of these chemicals, he formed , in 1902, what became known as “Dr. Wiley’s Poison squad.” Twelve young healthy men, recruited from the Department of Agriculture, pledge to eat nothing except what Dr. Wiley prescribed.

Over a period five years, Poison Squad members were fed measured doses of many kinds of commonly –used food additives. Dr. Wiley was not only concerned about determining the affects of these additives he was also interested in stirring up the public about the need for a pure food law.

The efforts of Dr, Wiley and the publication of the book The Jungle, by Upton Sinclair, which told of the fifth accompanying the production of meat and meat products, were powerful, moving forces that helped persuade Congress to pass the Food and Drug Act 1906 as well as the Meat Inspection Act of the same year.

In 1927, the Food, Drug and Insecticide Administration, later to be named the Food and Drug Administration (FDA) was created.
History of Food Additive
Further reading: Modern History of Food Additives

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Brief History of Food Flavor Industry

Flavorings are a major category of ingredients intentionally added to food. It is a sensation evoked with a range of technical terms in Greek and Latin.

Their history began when people discovered that components characteristics of the aroma of natural products could be enriched by simple methods.

The known utilization of spices and herbs extends over some 5000 years, starting with the ancient Egyptian. One of spices and herbs functions according to the historical period was the enhancing of food flavour.

The flavour industry has developed only after the past 160 years from small beginnings in companies specializing in the processing and marketing of natural botanicals such as the herbs and spices, vanilla beans, vegetables drugs and the distillation of essential oils and aromatic essences, the isolation of aromatic chemicals from these products and drug extraction.

Systematic development began in the 13th century, when pharmacies started to prepare so-called remedy oils and later recorded the properties and physiological effects of these oils in pharmacopeias.

Many essential oils currently used by perfumes and flavorists were originally prepared by distillation in pharmacies in the 16th and 17th centuries.

It was not until the latter half of the 19th century that chemicals began to realize the flavouring possibilities of synthetic aromatic chemicals.

In 1858, vanilla was first crystallized from an alcoholic extract of vanilla beans by Gobley.

Methyl salicylates followed in 1859 as ‘artificial wintergreen oil’ and benzaldehyde in 1870 as ‘artificial butter almond oil’ were synthesized by chemical industry for fruity odor.

It was 1872 before Charles established its empirical formula and two years later before Tieman and Haarman reported its structure and later Reimer confirmed it by synthesizing vanillin from guaianol.

Tieman and Haarman later founded a company, Haarman and Reimer and started the first industrial production of vanillin.

At about the same time organic chemists were preparing a wide range of highly odorous aromatic chemicals which were later to be of great value to the flavour industry.

The flavor industry emerged in the mid nineteenth century processed foods began to be manufactured on large scale.

In the early part of the twentieth century, Germany’s powerful chemical industry assumed the technological lead in flavour production.

A solution of esters for use as artificial fruit essences were exhibited in a trade fair in London and shortly after were in use in the United States.

In 1869, the first book of artificial flavouring formulations was published anonymously in Philadelphia.

In 1916, Walters manual for the essence industry was released. Its named ‘Manual for the Essence Industry.’ The intermediate period between the late 1950s and the early 1960s, produce major breakthrough in raspberry and strawberry flavors.

Today the industry is dominated by several very large multinational flavour and fragrance companies mainly prime in natural products and/or synthetic chemicals which are used in the compounding of an almost limitless range of flavorings and fragrance products.
Brief History of Food Flavor Industry

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