Milk Chocolate: Ingredients, History, and Production Process

To be legally labeled as "chocolate," a product must contain key ingredients such as cocoa mass (also known as chocolate liquor), cocoa butter, sugar, lecithin (an emulsifier), and vanillin (a flavoring). Milk chocolate additionally requires whole milk solids, which give it its creamy texture and light color.

The history of chocolate as we know it began in 1847 when Joseph Fry created the first solid eating chocolate by mixing cocoa butter with cocoa powder and sugar. In 1876, Swiss chocolatier Daniel Peter, in collaboration with Henri Nestlé, developed milk chocolate by incorporating condensed milk into the chocolate mixture. This innovation laid the foundation for the modern chocolate industry.

The production of milk chocolate begins with mixing cocoa liquor, cocoa butter, sugar, and milk solids. This mixture is then refined using roller or media mills, which reduce the particle size of sugar, cocoa, and milk solids to between 15 and 50 micrometers. This refining process smooths the texture of chocolate and is customized according to the manufacturer’s recipe and desired product profile.

The refined mixture undergoes conching, a slow mixing and aerating process lasting 6 to 72 hours. Conching evaporates excess moisture and volatile acids, improves flow properties, and enhances the flavor and texture of the chocolate. Following conching, the chocolate is tempered—a controlled heating and cooling process that ensures the cocoa butter crystallizes in the optimal polymorphic form (Form V). This step is crucial for giving chocolate its glossy appearance and crisp snap.

Milk chocolate, due to its added milk content and lower cocoa solids, has a sweeter and creamier taste compared to dark chocolate. It remains the most popular form of chocolate worldwide, with innovations such as plant-based milk chocolates now gaining attention to meet dietary preferences and sustainability goals.
Milk Chocolate: Ingredients, History, and Production Process

Evolution of Food Flavor Before the 19th Century

In 1492, Christopher Columbus embarked on his historic journey in search of new spices and seasonings, marking the beginning of an era where flavor would come to wield immense influence in global markets. Today, the success or failure of corporate giants, from soft drink manufacturers to fast food chains, hinges significantly on the taste of their products.

Throughout early history, culinary enthusiasts relied heavily on herbs and spices, whether whole or ground, to enhance the flavor of their dishes. The Middle Ages witnessed a surge in the extraction of flavors from fruits and aromatic plants, along with the distillation of essential oils, primarily utilized by pharmacists. However, it wasn't until the 19th century that the potential of essential oils in flavor enhancement for foods began to be widely recognized.

The practice of marinating or soaking foods in seasoned, salted liquids emerged between the mid-1600s and mid-1700s, further diversifying flavor profiles. However, it was the latter half of the 19th century that truly revolutionized the flavor industry. Chemists delved into the synthesis of synthetic chemicals, uncovering compounds like vanillin, which mimicked the flavors of natural substances.

A significant milestone occurred in 1830 when Wohler and Liebig synthesized benzaldehyde, a compound later identified in 1932 by Robiquet and Boutron-Charlard as the key component responsible for the aroma of bitter almonds. This breakthrough paved the way for the birth of the flavor industry, marking a pivotal moment in culinary history.

In conclusion, the evolution of food flavor before the 19th century was marked by a gradual progression from reliance on natural herbs and spices to the discovery and synthesis of synthetic chemicals. This journey not only expanded culinary horizons but also laid the foundation for the modern flavor industry that continues to shape our food experiences today.
Evolution of Food Flavor Before the 19th Century

Vitamin E Discovery

Vitamin E, first identified in 1922 by Evans and Bishop as an unidentified factor present in vegetable oils necessary for female rat reproduction, was initially denoted as 'factor X' and the 'antisterility factor.' Nevertheless, Evans proposed the adoption of the letter E for this factor to conform to the established naming convention used for vitamin D at that time.

In 1936, researchers successfully isolated an active vitamin E compound from wheat germ oil. This compound enabled animals to produce offspring, prompting the research group to name it alpha-tocopherol, derived from the Greek words 'tocos' (meaning childbirth) and 'ferein' (to bring forth), emphasizing its importance in rat fertility. The inclusion of the 'ol' suffix indicated the presence of an OH group in the molecule.

The correct structure of vitamin E was determined in 1938, and in the same year, P. Karrer successfully synthesized the substance.

During the 1940s, Canadian physicians discovered that vitamin E could provide protection against coronary heart disease in humans. Since then, the demand for vitamin E has rapidly increased, leading to a proliferation of product types available to the pharmaceutical, food, feed, and cosmetic industries.

In 1968, the Food and Nutrition Boards of the National Academy of Sciences officially recognized vitamin E as an essential nutrient.
Vitamin E Discovery

Discovery of vitamin C

Another name for vitamin C that derives from the Latin word ascorbic, which means ‘without scurvy’. Discovery of vitamin C is one of the biggest achievements in biochemical area. It was discovered by novel prize winner Albert Szent-Gyorgyi in 1928.

In that year Szent-Gyorgyi isolated hexuronic acid as the factor that prevented browning of decaying fruit. In 1932 it was proved to be the agent which prevents scurvy.

Written records dating back to ancient Egypt containing the earliest reports of scurvy, a dreaded human disease caused by vitamin C deficiency. Scurvy has remained constant threat to humans, causing death and misery whenever dietary sources of vitamin C became scarce.

Aristotle in 450 BC described the symptoms of scurvy, which include muscle weakness, lethargy, extreme fatigue, joint pains, bleeding gums, depression and eventually death.

During the 17th and early 18th centuries, many cures for scurvy were suggested and there was some evidence that fresh fruit could help.

In 1747, Dr. James Lind discovered that adding citrus fruit to the diet will helped prevent scurvy.

The popularity do vitamin C as one of the most widely used and highly valued vitamin began when Dr. Linus Pauling proposed in 1970 that the daily intake of vitamin C needs to be much higher than the official recommended daily intake of 60mg per day. He published his book in vitamin C: Vitamin C and the Common Cold.

Discovery of vitamin C