Questions tagged [food-chemistry]

For questions related to the chemistry of food.

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11 views

How reliable would commercially available starch be as a standard for an experiment?

I am conducting a student experiment of finding the amylose to amylopectin ratio of certain samples using an iodine colorimetry method. In order to calculate the actual ratios, I need a standard to ...
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28 views

Can you use food grade Argon gas to make whipped cream instead of Nitrous oxide? [closed]

argon gas is an approved food additive. it is sometime used as a propellent. can you use it to make whipped cream?
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What do we know about the structure of the amylopectin iodine complex?

I am studying a method of finding the ratio between amylose and amylopectin using the difference in color of the amylose-iodine complex(blue) and the amylopectin-iodine complex (red/brown). Through ...
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1answer
2k views

Why do green bell peppers become bitter when cooked?

Why do green bell peppers taste sweet raw, but become bitter when cooked (steamed)? What chemical process is responsible for this? (I don't believe the temperatures are high enough for the Maillard ...
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32 views

What does solid matrix mean?

I am reading "Effect of Freeze-Drying on Quality and Grinding Process of Food Produce": A Review by Timilehin Martins Oyinloye and Won Byong Yoon. The problem is they are referring to the ...
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9 views

Improving protein solubility in Water solvent (food science)?

I am trying to form a solution involving mixing my protein shakes. I am using a vegetable protein and it has poor solubility. Is their another protein I could use to entrap it to improve solubility? ...
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32 views

Carcinogenicity of home coated cast iron pans

Cast iron pans are a traditional cooking utensil and are becoming more and more popular in recent years. I myself switched from Teflon/ PFC pans to cast iron pans. To use the pan they are normally ...
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1answer
20 views

Could shear force from blending denature alpha amylase / glucoamylase enzymes?

I am trying to break down the starches in a certain variety of oats in the most efficient way possible. I have to break the whole oats down after cooking, so they are finer particles for the amylases ...
14
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1answer
430 views

What factors promote honey's crystallisation?

Honey is a complex mixture containing, probably, more than hundred compounds. I understand that the % of those components will affect the crystallisation. However, I am wondering what factors may ...
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29 views

How does iodine react with amylose and amylopectin, and can iodine colorimetry be used to determine the ratio between the two starches?

Based on some of the methods of studying starches in rice I looked at, I found that there are two general distinctions: ones that focus on the ratio between amylose and amylopectin ones that focus ...
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45 views

Why does sodium citrate in water turn black when blueberries are added?

I recently started making oral rehydration therapy for someone I'm taking care of who developed POTS after COVID-19 infection. (ORT was recommended by their doctor.) I use the standard ingredients of ...
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1answer
61 views

Can Fe and Ca react and become unusable in some foods?

In Turkish cuisine there is a popular food called "tahin pekmez" (tahini with grape molasses). According to a 2017 article on some Turkish news site, mixing these is supposedly counter-...
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30 views

How to extract limonene from the orange peels?

What is a reasonable procedure to extract the orange essential oil from the rinds? I thought this would be a common experiment. Here's what Wikipedia had to say, they identify the essential oil as ...
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24 views

Carbon Sequestration For Indoor Farming

First the backstory: We've begun growing mushrooms (currently Enoki, Lion's Mane and Blue Oysters if anyone is curious) for the sake of eating and maybe potentially selling someday soon. My partner ...
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4answers
95 views

If I hard boil eggs in a pressure cooker, will I get the same results regardless of altitude?

This seems like it should be obvious but for some reason (my chemistry is very rusty) I'm having a hard time articulating why the hardboiled egg recipe in an instant pot should yield the same results ...
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4answers
82 views

How to correct the pH and composition of bottled water?

For some time I've been buying a brand 'A' of (non-sparkling) bottled water. It wasn't easy to find one that I liked, because I make tea with it, and most other brands I tried made murky, smelly, dark ...
27
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2answers
3k views

The importance of the cold chain in the food and the pharmaceutical industry

There are these everyday things that one should know as a scientist and especially as a chemist, but which never come to light in an academic curriculum — at least not in mine. One such thing is the ...
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207 views

Does heating potato starch destroy its resistant starch?

Resistant starch, as found in potato starch, is supposed to have health benefits. There are differing opinions on whether or not heating potato starch destroys the resistant starch in it and thereby ...
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1answer
496 views

Why are there no alkaline foods?

It takes some work to find a list of the actual pH of various foods. (Searches are confounded by a popular "alkaline diet" theory that the pH effect on a human body of consuming various ...
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100 views

Does fractionation use enough heat to destroy nutrients in Coconut Oils when seperating the MCT oils?

We have recently been giving MCT (medium-chain triglyceride) oil to our dogs in place of Coconut Oil as from what I understand the majority of the benefits of Coconut Oil comes from the MCT's ...
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12 views

Is puffing through high pressure release the only way to make puffed cereal from a starch based mix or are there food safe chemical approaches?

I'm attempting to make puffed cereal at home and I was wondering with a chemical approach if it is possible to achieve the same structure and expansion which for example a puffing gun would be needed. ...
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2answers
2k views

Are food calorie values really integers?

According to what I've seen, fat has a listed caloric value of 9 Cal/g, while carbs and protein have listed caloric values of 4 Cal/g.* Are these numbers exact, or have they been rounded? And if they ...
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1answer
89 views

What is the main contributor of the color of honey? [closed]

I was told that the color of honey contains so much chemistry and that was interesting to me and after doing a couple of research I found that the color of honey depends on the presence of plant ...
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1answer
272 views

Are there any tasteless edible salts? [closed]

I saw on Youtube a video where caffeine was extracted from Red Bull using dichloromethane. However, due to dichloromethane tendency to form emulsions with liquid, an inefficient method was used to mix ...
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4answers
8k views

Can we fill potato chips bags with a gas other than nitrogen?

I understand that we fill potato chips bag with nitrogen to prevent oxidation. But why do we use nitrogen, instead of neon or hydrogen or something else? My first guess is that nitrogen is lighter ...
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32 views

Lowering the freezing point of a lipid by adding another lipid

I'm trying to stop bacon grease from congealing in the fridge by adding another lipid with a lower freeze point to it, but I'm not sure how much to add, as I'd like to keep the ratio as bacon-grease ...
2
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1answer
67 views

Chemistry of heat and egg whites

I tried to make Italian buttercream icing the other day and followed this recipe. Unfortunately, the icing was completely runny / liquid. So I know I made a mistake somewhere. But since I don't ...
2
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1answer
89 views

Chemical composition of silver tarnish

I had taken as a given that silver tarnish is a layer of silver sulfide on the surface of a utensil, and that cleaning it using a thiourea based agent like Tarn-X dissolves the sulfide layer. However,...
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2answers
713 views

How to measure the color of honey? [closed]

After doing some research, I found that honey's color could be a factor of climate. I am very interested in this subject and I'm a high school student so we don't have as much apparatus as you would ...
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1answer
166 views

Ripening of bananas?

So, obviously the ripening of bananas involves changing it’s chemical composition. For example, ripe bananas have a much higher amount of sugar. It is also known that reaction rates are generally ...
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1answer
118 views

Cooking IN CO2 gas? [closed]

Quick theoretical question: What if I replaced water with dry ice in my pressure cooker? Assuming I used a calculated amount to prevent an explosion... Would It be able to cook? Would it dehydrate ...
7
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1answer
716 views

Does storing apples alongside potatoes keep potatoes from sprouting?

I am looking for a chemical explanation which I wasn't able to find. I have read in several sources such as this one that, in order to prevent potatoes from sprouting, it is sufficient to store a few ...
2
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1answer
242 views

Why is absorbance in UV-VIS spectrometer negative even after calibration?

I was collecting data to plot a calibration curve using pure beta-carotene sample. Prepared 5 different concentrations of beta-carotene dissolved in methanol. Pure methanol was used as blank. However, ...
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3answers
1k views

Is there a way to create natural Red food coloring from Turmeric in the house kitchen?

As a non chemist I have read in the Wikipedia article Curcumin that: Curcumin becomes bright red when it interacts electrostatically with phospholipid film. This text appeared without source ...
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2answers
365 views

Is there any way to chemically check sweetness level in any drink or water or tea etc?

I was wondering if there is a test or way to find out how sweet any drink is? For example, if I mix sugar in water, how can I test its level or number of sweetness?
3
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1answer
131 views

How can they “wash away” the caffeine from Nescafe Gold to produce that “de-caf” version?

I buy and drink Nescafe Gold all the time. I also buy the smaller "caffeine-free" version of the same product. It tastes very differently, which makes me assume that the caffeine does have a lot of ...
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3answers
10k views

What substances do humans consume that are caloric but neither protein, carb, nor fat?

On the Medical Sciences StackExchange site I asked Can a calorie be neither protein, carb, nor fat? and got a very helpful answer, which was that ethanol (in alcoholic drinks) is caloric but neither ...
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1answer
20 views

salts affecting the salinity of water [closed]

I know there are different types of salts like Himalayan salts table salts etc. I was wonder do different types of salts have a different level in salinity when dissolved in water.
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31 views

What's a non-toxic flavorless water-soluable chemical I could use for freezing point depression when making ice cream?

I'd like to make a savory version of ice cream. So I can't use sugar or any artificial sweeteners for the freezing point depression needed to control ice crystal sizes. What can I use?
3
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1answer
567 views

Cleaning with Vinegar - what surfaces does it react badly with? Metal window sills ok?

I'm cleaning up some mould around the home and I have some substance on my window sills which I'm not quite sure if it's dirt or mould. I have read about using Vinegar to clean up mould, but an ...
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0answers
41 views

How can a DPPH assay to measure antioxidant activity of beta carotene be conducted?

I am currently doing some research regarding beta-carotene. With reference to other sources and their methodoloy for DPPH assay, I conducted my experiment but failed to find any significant peak in ...
3
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0answers
462 views

Why dried, closed coconuts go through carbonation?

Some dried, closed coconuts go through carbonation: The white meat of the coconut becomes disintegrated and smeary The liquid becomes carbonated with a bit sour-salty tasted coconut water (which ...
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5answers
4k views

How would I measure the Carbon Dioxide content in Coca Cola over a period of time?

I'm sorry if this is a broad question, but I am trying to plan a simple experiment. I am wondering is there a somewhat simple way of continuously measuring $\ce{CO2}$. I already know the initial ...
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0answers
43 views

Is there an edible version of nylon string?

I'm working on a project where I have to check the feasibility for product ideas. It has to connect other parts and float on the water's surface. My friend thought that maybe glass noodles would be ...
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1answer
113 views

Does clove oil/eugenol interact with nylon type plastics?

So I am aware that the eugenol in clove oil readily melts #6 type plastic (polystyrene). Polypropylene has a higher resistance, while HDPE type plastics seem to have the highest resistance. My main ...
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2answers
64 views

Is a liquid vitamin E supplement possible without additives? [closed]

Looking at E vitamin products sold commercially, all “pure vitamin E oil” products seem to be for skincare rather than consumption as a supplement. I have read that d-alpha tocopherol is the form of ...
2
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1answer
94 views

How is antioxidant activity of carotenoids determined?

I am doing some research regarding carotenoids and beta-carotene. After extracting the sample, I have not been able to find a way to measure antioxidant activity of beta-carotene. I have $\pu{0.1mM}$ ...
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0answers
69 views

Home test for the presence of sugar in erythritol

Is there a test to distinguish erythritol from sugar at home without expensive lab equipment or exotic reagents? Sometimes I purchase erythritol online and wonder if it's been diluted with sugar.
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2answers
1k views

Is it wrong to allege that lemons and limes are alkaline? [duplicate]

Please ELI5; I've never studied chemistry. I read about alkalinity v. basicity here and on Sciencing.com. Lemons and limes are doubtless acidic. Lime: The pH range of lime is 2.00 to 2.35. Lemon: ...
7
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1answer
978 views

Is black tea a pH indicator?

Today, I made a cup of lemon tea in a different way than usual. Instead of pouring hot water in to a mug containing lemon juice and black tea (my normal routine), I let the tea steep for a little ...

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