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Questions tagged [food-chemistry]

For questions related to the chemistry of food.

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Effects of UV light on bread shelf life [closed]

Does UV light on bread fermentation helps it to have longer shelf life?
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Are alkaline conditions required for Maillard reaction?

The Maillard reaction, a form of non-enzymatic browning, refers to a cascade of chemical reactions that frequently occurs in the cooking of foods (e.g. baking of pastries, roasting of meats). It ...
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1answer
32 views

Is it possible to turn food into fuel for a combustion engine? [closed]

According to McDonald's Nutrition Calculator page, the following order would contain 2480 kilocalories (or 10376 kilojoules): 1 x Double Bacon Smokehouse Burger 1 x Large Chocolate Shake 1 x Large ...
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3answers
5k views

Sugar solutions have a neutral pH in themselves, but it makes your body acidic. Why? [closed]

I'm not an expert, but as far as I understood a sugar solution is completely neutral since sugar can't take hydrogen ions out of the water or donate them in. Sugar is a non ionic compound, so it does ...
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1answer
21 views

Identifying food, quick and cheap? [closed]

I’m asking this question in the most technical perspective of identifying substances, so I’m not considering the use of chemical tests like Benedict’s solution, biuret solution, Sudan III stain, or ...
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0answers
80 views

Why does cooked liver turn green after a while?

I've noticed that cooked liver tends to turn green if not consumed shortly after cooking. The picture below shows cooked pork liver with green patches which developed after being chopped into pieces ...
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1answer
12 views

Properties of food in different states [closed]

I've gotten into a heated discussion over the topic of foods before and after they have been cooked and or mixed. My opinion is that the properties obviously change once either mixed or exposed to ...
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1answer
106 views

Is flour or baking soda really suitable for extinguishing grease fires?

I think most have heard the advise that you should put flour (or baking soda) on a grease fire to absorb the oil before. While this is certainly better than using water, I'm skeptical. For starters ...
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1answer
26 views

emulsion - why does it make a differnce if you have have more/less water/oil

So I have been wondering why you can see the following: Using 10 ml oil and 1 ml water with and emulgator leads to a way better emulsion than if you use 10 ml water with 1 ml oil (if you use the ...
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1answer
51 views

Any consumable liquid that would dissolve ground coffee?

Figured I would try here rather than a food-oriented forum. Is finely ground coffee (Espresso/Turkish) soluble in any consumable liquid? Otherwise asked: is there any liquid available to the average ...
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2answers
1k views

Why does lavender oil dissolve plastic?

A few weeks ago I decided to harvest the lavender in my garden and put it through a still to extract the essential oils. The still in question is essentially just an air cooled condenser. I collected ...
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0answers
43 views

Formation of caffeidine in Noon Chai

Noon Chai (as described in this question) from Kashmir is prepared by adding common salt and sodium bicarbonate to green tea and cooking it for quite some time (~ 30 minutes). Noon Chai is also ...
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27 views

Glucose test strip science project

My daughter is interested in doing an IB science project related to glucose test strips. It has been a little difficult finding references for background review of literature into the chemistry of ...
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1answer
23 views

E227 Food Additive effectiveness

I have been researching on E227 (Calcium Bisulfite), and could find minimal information about how it acts as a preservative and how effective it is. I could only find that it preserves by converting ...
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2answers
95 views

Is sugar necessary for the sweetening effect of food?

A lot of food packages, nowadays, are mentioning "0 g sugar" or "sugar free". Then how do those still taste sweet?
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0answers
28 views

cluster of milk [closed]

I have a problem with milk when we are making yogurt in factory. When the milk pass through the machine it clogs the filter of the machine because the cluster that formed on the filter. My question is ...
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2answers
105 views

Why is cooking not potentially lethal? [closed]

Even the simplest ingredients used in cooking, such as a banana, contain hundreds of chemical compounds. When we cook we mix several of these ingredients and apply heat, which makes a perfect ...
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1answer
32 views

Can sucralose form a syrup?

(Almost) Everyone is familiar with making simple syrup from table sugar and water. I was wondering if pure sucralose is also capable of forming a syrup. I wanted to do an experiment myself, but to ...
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2answers
43 views

What is oil smoke point?

I understand that the smoke point is the temperature at which oil starts to produce smoke. But how exactly is that smoke produced? I've read that it is related to hydrolysis and oxidation, but I'd ...
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1answer
145 views

Naturally Occurring Sulfites or Sulphites form

In the following link, it says that the product May contain trace amounts of naturally occurring sulfite residue I asked the manufacturer about it and the explanation I got was: The trace ...
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2answers
4k views

What causes the “rotting fish smell”?

Rotting fish seem to give off the same (very pungent) kind of smell, regardless of the kind (salmon, seabreen, tuna, etc). What exactly is it that's responsible for this unique smell? (Though I've ...
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0answers
36 views

How does alcohol infusion (maceration) work chemically?

To make liqueurs (e.g. lemon liqueur) you take some fruit and/or plant and let them macerate in pure alcohol to make the alcohol have the fragrance and color of the original ingredient. How does it ...
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2answers
254 views

Why does the outside of a plastic cooking oil bottle get sticky over time?

Cooking oil (I've observed it with canola oil, if that matters) is not ordinarily sticky. When I buy a plastic bottle of it, the outside is not sticky. But when use some of it, then return after a ...
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1answer
39 views

Why is there only a slight change in pH when soda loses its fizz?

I did an experiment for my chemistry class and did a control with sparkling water and the pH increased by a significant amount, but when done with sodas like cream soda, coke, or 7 Up, the pH change ...
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1answer
95 views

Last step of nicotine extraction using DCM

After using hydro-distillation method with distilled water and NaOH, separating the extract with dichloromethane, distillate it at 40 °C/104 °F, I'm left with some yellow pale oil. I'm just wondering ...
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1answer
84 views

What forms the emulsion in chocolate?

Some days ago, before buying a chocolate I read the ingredients and saw that it contains a natural emulsifier. A Google search didn't reveal anything about of what the emulsion formed is, do you have ...
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2answers
69 views

Does boiling milk really make the nutrients in it less useful to the body when ingesting it?

Does “denaturing” nutrients in milk by boiling it make them less useful, or actually more useful, as they undergo “denaturation” anyway during digestion? I've read online that boiling milk "denatures"...
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0answers
144 views

Why do gnocchi float when they are cooked?

Gnocchi is a kind of pasta made with flour, potatoes and eggs. They are cooked in boiling water and when they are ready to be eaten they float. Why do they float when they are cooked? I found two ...
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1answer
63 views

How does salt push out the water from vegetables, meat, etc.?

Where can I find out, how does this process work? Have you noticed, that when you salt mushrooms, eggplant... or add sugar to lemon - some "juice" comes out. Any explanations? Or maybe name that ...
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1answer
44 views

Is food color E-132 indigotine, carcinogenic?

I have seen different opinions on food color E-132 Indigo carmine (indigotine, FD&C Blue 2) if it forders cancer.
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1answer
159 views

How does calcium chloride act as a sequestrant (food science)?

This Wikipedia page lists common sequestrants (with respect to food science). As stated on the page: A sequestrant forms chelate complexes with polyvalent metal ions, especially copper, iron and ...
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1answer
102 views

Why does butter get soft with heat, but not ice?

Sometimes a recipe asks me to soften the butter before I use it. This can be accomplished with a few seconds in the microwave, or just by leaving it out at room temperature for a while. Ice, on the ...
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0answers
66 views

Why is kapton/polyimide not food safe?

This engineering plastic is known to be extremely resistant to heat - it is used for applications like flexible circuit boards that can withstand direct contact with a soldering tip - and would seem ...
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2answers
53 views

Fried potatoes absorbing oil [closed]

Suppose we bring a pan and put in it some oil and turn on the heat, before the oil could get very hot and nearly boiling, we put on the potatoes that start frying. Someone told me that if the ...
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1answer
77 views

Why does salty water make hard boiled egg shells more fragile?

Boiling eggs in salty water rather than regular water makes the salt react with egg shells making them more fragile. My guess is that it's either sodium or chloride reacting with the calcium in eggs. ...
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1answer
44 views

Why Greek yogurt has higher protein concentration?

During fermentation, no nitrogen is added and the number of amino acid molecules cannot increase. Why does it have a higher protein concentration than milk?
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What's the differnce between Short-Chain and Long-Chain Inulin?

I know that Inulin is a polysaccharide consists of polymer of Fructose. The question here when I can say this Inulin is "Long-Chain" or "Short-chain"?
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1answer
43 views

Freezing liquid by dipping in liquid nitrogen? [closed]

It's a simple question from a chemistry-challenged person. Is it possible to pour something liquid (water, juice, etc) into a special container and dip that container into liquid nitrogen so it ...
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0answers
35 views

Is it possible to test presence of diacetyl (2 3-butanedione) in beer at home?

I am trying to understand if I can perform diacetyl test at home. To get actual number. For example just received test result from lab and it says 200ppb, can I perform this test at home?
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1answer
5k views

Why are limes alkaline, but lemons are acidic? They taste about the same [closed]

So, this is kinda a dumb question, but I'm curious.
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28 views

Why do frozen whipped cream remain “frozen” when thawed?

I froze some pastry with whipped cream on the other day (by mistake, I placed it on my balcony and expected it to be a few degrees above zero, but it wasn't). When I unfroze it again I was expecting ...
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2answers
307 views

Classification/Nomenclature of aroma and flavour compounds - terpenes, aldehydes, and alcohols, etc

I'm collating different types of aroma compounds but the nomenclature and classification structure is confusing. How do you classify flavour compounds that can belong to different groups (e.g. ...
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1answer
66 views

Using drip extraction, how much caffeine is extracted from coffee as a function of the amount of water used?

When using a drip coffee maker, there are basically two choices we make: the amount of water and the amount of coffee grounds. If we use the same amount of coffee grounds but double the water, how ...
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1answer
52 views

Are artificial ingredients better than natural ones because they are made in laboratory conditions?

If we have something like an artificial vanilla flavouring, is it any worse than a natural one? Will both the natural and artificial ones have the same chemical formula? Won't the artificial one be ...
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0answers
267 views

Orange Melting / Dissolving Plastic Knife?

So I was just cutting the peel of an orange with a plastic knife and when I went to wipe of the juice from the knife with a paper towel I noticed that a black residue came off the knife where the ...
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0answers
102 views

Coffee and argon/nitrogen [closed]

I’ve recently been experimenting blanketing coffee with argon and nitrogen. I’m finding that argon has a more positive result. I can’t find any data or information that would confirm this other then ...
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2answers
963 views

Does calcium hydroxide react with citric acid in orange juice?

I noticed that calcium-fortified orange juice on the shelf at my local grocery store contains calcium in the form of calcium hydroxide. And I also noticed a couple other ingredients that ordinary ...
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2answers
182 views

Why doesn't cottage cheese melt?

Most kinds of cheese melt but cottage cheese does not at usual cooking temperatures. During the preparation of various kinds of cheese, I have heard of a coagulant named ‘rennett’ being added along ...
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1answer
82 views

Why is butter harder if it once got warm?

I realized that butter, when kept cool after buying, can be easily cut and spread when taken out of the fridge. If it gets warm once, however, it will be less soft the next time I take it out of the ...
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1answer
306 views

Difference between ginger essential oil and ginger powder [closed]

I'm planning to prepare natural toothpaste. Some recipes include ginger essential oil while others include ginger powder. What is the difference between them? Will ginger powder be as effective as ...