You’re Surrounded by Organic Chemistry

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spk_0 Picture this. You wake up to the smell of freshly brewed coffee, the sweetness of vanilla

spk_0 drifting from the kitchen, and the bright scent of citrus as you slice into an orange.

spk_0 You don't think about it, but every single one of these sensations is chemistry at work.

spk_0 From the flavors in your food to the colors in your clothes, organic chemistry is constantly

spk_0 shaping your world. How do molecules create taste? Why do some sense make us feel nostalgic?

spk_0 We often think of chemistry as something that happens in labs, but really it's all around us.

spk_0 The molecules in our food, the pigments in our clothes, even the way soap cleans our hands.

spk_0 It's all driven by organic chemistry. So today we're stepping out of the lab and into the real world

spk_0 to see how chemistry shapes, flavors, smells, colors, and even the products we use every day.

spk_0 Let's start with that. Why does food smell and taste the way it does?

spk_0 The way something tastes or smells depends on how molecules interact with receptors in your nose and mouth.

spk_0 Our taste buds and scent receptors recognize different molecules based on their chemical structure,

spk_0 which is why some foods taste sweet, others bitter, and some, well, just plain weird.

spk_0 The shape of a molecule plays a huge role in whether it triggers our sweet, sour, bitter, salty,

spk_0 or umami receptors. For example, sugars like glucose and fructose fit into sweet receptors,

spk_0 while bitter compounds like caffeine and quinoine interact with completely different ones.

spk_0 When it comes to smell, molecules that evaporate easily volatile compounds bind to

spk_0 olfactory receptors in the nose, producing distinct aromas. That's why esters, which have a fruity

spk_0 structure smell like bananas or apples, while sulfur compounds found in garlic and onions

spk_0 have much stronger, more pungent odors. The chemistry of smell is also why some people experience

spk_0 sense differently. Our receptors can be genetically tuned to be more or less sensitive to certain

spk_0 compounds. So sounds like the reason strawberry smell sweet and sock smell awful comes down to chemistry.

spk_0 Exactly. And different types of molecules contribute to different smells and flavors. For example,

spk_0 let's talk about esters. These are a type of organic compound that form when an alcohol reacts with a

spk_0 carboxylic acid, producing a molecule with a characteristic fruity or floral aroma. These compounds

spk_0 are responsible for many of the pleasant scents in fruits and flowers. For example, the banana

spk_0 like scent of isoamil acetate and the pineapple like smell of ethyl butanoid both come from esters.

spk_0 Esters are widely used in perfumes, artificial flavorings, and even solvents due to their

spk_0 ability to evaporate easily and release strong scents. Aldehydes and ketones are two types of

spk_0 organic compounds that play a major role in the chemistry of scents and flavors. Aldehydes contain

spk_0 a carbonyl group co at the end of a carbon chain while ketones have the same functional group

spk_0 but positioned within the chain. Their structural differences influence their chemical properties

spk_0 and interactions with our senses. Aldehydes are responsible for many familiar aromas like

spk_0 Vanillin and Vanilla and Cinemaldehyde in cinnamon which provide warm and comforting scents.

spk_0 ketones on the other hand contribute to fragrances like acetylifenoan found in perfumes

spk_0 and dihydrojasminone which gives jasmine its distinctive floral smell. In a similar manner,

spk_0 there are sulfur compounds that are behind the pungent odors of onions, garlic, and even skunks.

spk_0 So the same type of molecules that make banana smell nice are also in artificial candy

spk_0 that explains why some banana flavored candies taste like they were made by someone who has never

spk_0 actually seen a banana. Aldehydes that's because artificial flavors often isolate just one key

spk_0 compound while real fruit contains many different molecules that create a more complex scent and taste.

spk_0 Okay now I'm curious how does cooking change flavors? Aldehydes great question. When food is

spk_0 heated something amazing happens. The myard reaction. This is a chemical reaction between amino

spk_0 acids from proteins and sugars which creates complex flavors in aromas. So cooking is just controlled

spk_0 chemistry. Does this mean I can start calling myself a scientist instead of a bad cook? Pretty much.

spk_0 The myard reaction is a complex series of chemical reactions that happen when heat transforms proteins

spk_0 and sugars in food creating new flavors, colors, and aromas. It's responsible for the deep flavors

spk_0 in grilled meat, the golden crust on bread, and even the rich taste of roasted coffee.

spk_0 Different cooking temperatures influence how the myard reaction unfolds, creating varying

spk_0 compounds at different stages. That's why a steak cooked rare medium or well done has different

spk_0 tastes and textures. Lower heat creates more subtle flavors while higher heat leads to deeper

spk_0 browning and more robust roasted flavors. This reaction is what makes roasted nuts smell amazing,

spk_0 caramelized onions taste sweet and why toasted marshmallows develop that irresistible golden crust.

spk_0 The myard reaction is truly the chemistry behind delicious food. And that irresistible smell

spk_0 of freshly baked bread. That's a mix of caramelized sugars and volatile compounds,

spk_0 which trigger our brain's reward system, making us crave it. The myard reaction is why we instinctively

spk_0 love the smell of cooked food. Let's talk about another chemistry-based wonder. Why things have color?

spk_0 The reason things have color comes down to how molecules absorb and reflect light.

spk_0 Some molecules absorb certain wavelengths and reflect others. What we see is the reflected color.

spk_0 This happens because certain molecular structures have conjugated systems, where electrons are

spk_0 spread out over multiple atoms, allowing them to interact with light in a specific way.

spk_0 The energy of light absorbed determines what color we perceive.

spk_0 For example, B-carotene, the pigment that makes carrots orange, absorbs blue and violet light

spk_0 while reflecting yellow and red. Similarly, anthocyanins found in blueberries absorb green

spk_0 and yellow wavelengths, making them appear blue or purple. The same principles explain why autumn

spk_0 leaves change colors. Chlorophyll breaks down, revealing carotenoids and anthocyanins that were

spk_0 always present beneath the green. This ability of molecules to absorb and reflect light is also

spk_0 used in fabric dyes, food coloring, and sunscreen, for example, which absorbs UV light to protect our

spk_0 skin. Oh, so my favorite blue jeans owe their color to chemistry? Yes, the dye indigo is an

spk_0 organic molecule that absorbs red and yellow light, reflecting blue. Natural dyes from plants,

spk_0 insects, and minerals have been used for centuries, but today we also use synthetic dyes to create

spk_0 vibrant colors in fabric, food, and cosmetics. Okay, one last question on colors before we move on.

spk_0 Tumoric. Why does it stain everything yellow for eternity?

spk_0 That's thanks to curcumin, the active compound in turmeric. Curcumin has a structure that allows

spk_0 it to absorb blue and violet light, which leaves behind the bright yellow color that stains

spk_0 everything it touches. Curcumin is also highly reactive, binding to proteins and surfaces in a way

spk_0 that makes it difficult to wash off. That's why turmeric stains seem to last forever, no matter how much

spk_0 soap and scrubbing you try. Turmeric is like that one guess to overstays or welcome. Use it once

spk_0 and suddenly your countertop, your hands, and your favorite white shirt are all a permanent shade of

spk_0 yellow. All right, beyond food and colors, another area where organic chemistry is indispensable is in

spk_0 soaps, cosmetics, and plastic. I see. So what is the chemistry superpower that soap molecules have?

spk_0 Soaps and detergents work because their molecules have two distinct parts, one that loves water,

spk_0 hydrophilic, and another that repels it, hydrophobic. This special structure allows them to

spk_0 surround grease and oil, breaking them apart, and lifting them away with water. When soap molecules

spk_0 encounter grease, their hydrophobic tails attach to the oil while their hydrophilic heads stick to

spk_0 water molecules. As water rinses away the soap, it pulls the trapped grease along with it. This

spk_0 process called micelle formation is what makes soap such an effective cleaner. So basically soap

spk_0 molecules are tiny double agents? That's one way to put it. Then in cosmetics, organic compounds like

spk_0 emulsifiers keep lotions smooth, preservatives prevent spoilage, and fragrances use chemistry to

spk_0 make natural sense. Finally, there are plastics. Many modern plastics use organic chemistry to be

spk_0 lightweight, durable, and even biodegradable. Scientists are now creating eco-friendly plastics

spk_0 that break down safely. As we come to an end of the episode and the season, I must say that

spk_0 I can't help but unsee chemistry everywhere. Thanks for that. You're welcome, but we have just

spk_0 scratched the surface. Chemistry is more than just molecules and reactions. It's the language of

spk_0 transformation, the invisible force that shapes our world. Over this season, we've journeyed from

spk_0 the very building blocks of organic chemistry to the wonders of chirality, aromaticity, and the

spk_0 chemistry of everyday life. We've seen how the myard reaction brings flavor to our food,

spk_0 how resonance stabilizes molecules, and how spectroscopy allows us to see the unseen.

spk_0 We've discovered that chemistry isn't just in laboratories, it's in the smell of rain,

spk_0 the colors of autumn leaves, the taste of chocolate, and even the soap that washes our hands.

spk_0 And yet, we've only just begun. If this season was about understanding how chemistry

spk_0 creates the world around us, next season will be about unlocking the forces that drive these changes.

spk_0 What happens when molecules break apart and reassemble in unexpected ways? How do catalysts

spk_0 speed up reactions that should take centuries? What makes polymers the backbone of modern materials?

spk_0 And how do chemists reverse engineer nature to build life-saving drugs through

spk_0 retro-synthesis? These are the transformations that fuel chemistry, the radical shifts,

spk_0 the molecular rearrangements, the invisible forces that power everything from medicine to

spk_0 material science. In the next season, we will explore the dynamic, mysterious world of chemical

spk_0 reactions, where molecules collide, bonds break, and new compounds are born.

spk_0 The mysteries of chemistry are just getting started. Thank you, Stain,

spk_0 with us this season we would love to hear your comments, what you liked, what can we do differently,

spk_0 and even though we have uncovered so much, but there is so much more to explore.

spk_0 Stay with us, because the next chapter in this journey is going to be even more exciting.

You’re Surrounded by Organic Chemistry

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