Shelf Life

Does Cornstarch Go Bad?

Have you ever been in a pinch with cooking and wondered if cornstarch was still good?

If you’ve ever asked yourself this question then stick around. We have the answers!

We researched why cornstarch might go bad. Also, what you can do to make sure it does not spoil. We have some tips on the right way to store it.

Storing your ingredients correctly helps you make great food and saves money too. Also, find out how to store corn syrup to maintain its quality and usability.

Keep reading as we address the big question of “Does Cornstarch Go Bad?”

How Long Does Cornstarch Last?

Cornstarch is a great item to keep in your kitchen. It can last for a very long time! Cornstarch is made from corn and it helps make sauces and gravies thick.

You can also use it for making cakes, cookies, or even playdough.

The shelf life of cornstarch is indefinite. As long as it’s stored properly, in a cool and dry place away from direct sunlight, it can last for years without going bad. For best results, it should be sealed tightly in an airtight container to prevent moisture or insects from getting in.

The cornstarch should also be kept away from high temperatures or humidity, which can cause it to spoil faster.

Cornstarch Stays fine indefinitely

How To Tell If Cornstarch Has Gone Bad?

How do you know if your cornstarch has gone bad? Look for signs like clumps, a bad smell, or discoloration.

It is easy to know if your cornstarch has gone bad. It is a white powder, so you can easily see if it looks different than usual.

If your cornstarch looks different, it may not be good to eat. Here are 5 signs that your cornstarch has gone bad and you should throw it out.

1. The Appearance Of Bugs

How To Tell If Cornstarch Has Gone Bad | Epic Nutrition

It is easy to tell if cornstarch has gone bad. Look for bugs. If you see any, the cornstarch is not good and should be thrown away.

Bugs look like small brown or black spots on the surface of the cornstarch. Sometimes, they are in clumps that feel like sawdust.

Not all bugs are bad though. There are some which actually help in the preservation of the cornstarch, like live beneficial bacteria or yeast.

These can usually be identified by their whitish color and must be removed from the cornstarch before use.

Eating food with bugs can make you sick. To keep this from happening again, store your cornstarch somewhere cool and dry. Check it often for signs of spoilage.

2. The Presence Of Mold

The most obvious sign that cornstarch has gone bad is the presence of mold. If you see any mold on your cornstarch, it’s best to discard it immediately.

Cornstarch can have mold on it. Some types of mold make bad things called mycotoxins.

Mycotoxins can be dangerous. These toxins can be harmful if ingested, so it’s best to avoid using cornstarch with mold on it.

3. Your Cornstarch Has A Bad Smell

Another indication that cornstarch may have gone bad is if it has an unpleasant smell. Any strong or sour smells are generally a sign that the product has spoiled.

If you notice any strange smells coming from your cornstarch, it’s best to discard it and purchase a fresh container.

4. Sour Taste Is A Warning

Sour Taste of cornstarch | Epic Nutrition

Have you ever sampled your cornstarch prior to cooking? If not, then it’s time for a change! Make this an easy habit and witness the tremendous benefits.

Before adding cornstarch to your soup or sauce, take a tiny bit and taste it. If it tastes sour, you should not use it. Throw it away and get a new one.

5. When You Find Lumpy Cornstarch

If you ever find lumps in your cornstarch, don’t worry. Usually, the lumps are okay and can be fixed. Sometimes the lumps mean the cornstarch has gone bad and should not be used.

To determine whether your lumpy cornstarch is safe to use, you can do a few things. First, check for any discoloration or strange smells. If the product does not seem off in any way, then it is likely okay to use.

You can also get a small amount of cornstarch with a drop of water and then rub it between your fingers. If the lumps feel hard and crunchy, then you should discard the product as that is usually an indication that it has gone bad.

If there are only mild lumps in the cornstarch, then you can fix them by sifting through a mesh strainer.

At-Home Test For Quality Assurance Of Cornstarch

If you’re still unsure about the quality of your cornstarch, conducting an at-home test can be useful.

  • Fill a glass with cold water and add a teaspoon of cornstarch to it.
  • If the starch immediately dissolves in the water, it’s still good to use.
  • If it doesn’t dissolve, it may have gone bad and you should discard it.

Health Risks: Is It Okay To Use Bad Cornstarch?

It is dangerous to use bad cornstarch. It might have bacteria that can make you sick or cause big health problems.

Cornstarch is used in many foods, so check the expiration date before using it.

Bad cornstarch can also cause food-borne illnesses. If you’re using bad cornstarch, it’s important to discard it immediately and replace it with a fresh batch.

Eating too much cornstarch, even if it is not spoiled, can be bad for your health. It can cause problems like:

Your blood sugar level will be increased:

Cornstarch does not have much fiber. Fiber helps keep your blood sugar level steady. Without fiber, your blood sugar can rise quickly.

Carbohydrates in cornstarch can raise your blood sugar. The glycemic index measures how much it affects your blood sugar levels.

Fiber is an important part of the food. It helps your body take longer to absorb sugar into your blood. Foods that are low in fiber do not have this benefit.

Thus, cornstarch is easy for your body to digest. This can cause your blood sugar levels to go up quickly.

Research shows that people with type 2 diabetes or who want to keep their blood sugar levels healthy should not eat cornstarch.

It’s harmful to your heart health:

Cornstarch is a type of carbohydrate. Eating too much of it can cause heart disease. You should not eat spoiled or too much cornstarch. It is not a good idea to do this, even if you don’t want to.

Does Cornstarch Lose Its Thickening Property Over Time?

No! You can keep cornstarch in your pantry for as long as you’d like and it will still maintain its thickening power.

The shelf life of cornstarch is virtually indefinite, so you don’t have to worry about the product going bad.

Cornstarch is a powder made from corn. It has long pieces of carbohydrates called polysaccharides.

When heated with water, the polysaccharides get bigger and thicker like gel. This makes sauces, stews, and gravies thick.

So even if your cornstarch is old or has been in the pantry for years, it will still do its job as a thickener. Just be sure to store it in an airtight container and keep it away from moisture to ensure maximum effectiveness.

How To Properly Store Cornstarch

If you want your batch of cornstarch to last longer then it is very important to store it properly. It can be done in very simple steps that are explained further.

1. Airtight Jars

Airtight Jars | Epic Nutrition

If you want to use cornstarch, it is important to keep it fresh. Put the cornstarch in a jar or container that keeps air out. This will stop moisture and other things from spoiling the cornstarch.

To store cornstarch the right way, start by transferring it to a clean, dry container with a tight-fitting lid.

Make sure the seal is secure and that your cornstarch isn’t exposed to any moisture or other contaminants.

When you put something in the container, make sure to close the lid tightly. This also applies to your cornstarch container. If it is not closing tightly, use sealing tape or clips to help keep it closed.

2. Where To Store Cornstarch Jars

It is important to store cornstarch in the correct way. This will help it stay fresh and usable for a long time.

Leave In Dark & Cool Places

Put your cornstarch in a cool, dry, and dark place. Don’t put it near things that give off heat, like a dishwasher or oven.

Please don’t put it in the fridge or freezer either because it will get lumpy and won’t work as well.

It’s also important to make sure your jar is tightly sealed when not in use. This will help keep moisture out and prevent any bugs from getting in.

Keep Away From Heat

Make sure while storing cornstarch to keep it away from high temperatures. Heat can cause the powder to clump together, making it unusable for cooking and baking.

To prevent this, make sure you keep it in a cool, dry place away from any direct heat sources like ovens or stoves.

3. Keep Moisture Away From Your Cornstarch

Put your cornstarch in a safe place. Don’t keep it out for too long or the air will make it wet and it won’t work anymore. If this happens, you need to either use it right away or throw it away.

You do not want mold to grow, right? To help keep your cornstarch for longer, make sure it does not get too wet.

Can We Freeze Cornstarch?

No, you cannot freeze cornstarch. When frozen, the starch molecules expand, creating an unpleasant texture and flavor when thawed out.

Cornstarch helps keep soups and sauces from becoming too runny. It also makes them thicker once cooled.

However, if you freeze cornstarch with liquid ingredients, it will become gummy and clumpy when heated.

It is not a good idea to freeze your cornstarch. It can get spoiled more easily than if you store it in the cupboard or pantry. There are two reasons why this is the best way.

More Risks In Moisture Exposure

The freezer is a place to store food with a lot of water. It helps to keep the water in those foods so they last longer. Cornstarch is already dry and doesn’t need the freezer.

Do not put cornstarch in the freezer. It can get too wet and it is easier for it to spoil because of other food smells.

Cornstarch Has Already Had A Long Shelf Life

You don’t need to freeze your cornstarch. It can stay good for a very long time if you store it properly. Freezing is an option but it is not necessary.

Cornstarch Uses

For those looking for a natural and cost-effective product, cornstarch is an ideal addition to your pantry. It can be used in many creative ways in the kitchen as well as around the home.

So grab some cornstarch today and explore all the exciting uses it has to offer!

Thickening Agent 

Cornstarch is a pantry staple used for thickening sauces, soups, and stews. It’s also known as cornflour and is made from the endosperm of maize or corn kernels.

Cornstarch has twice the thickening power of regular flour and is an excellent gluten-free substitute for wheat flour in many recipes.

Cornstarch can be used to make sauces, soups, and stews thicker. To do this, mix 2 tablespoons of cornstarch with the same amount of cold water until it looks like milk.

Add this mixture at the end of cooking and stir often. The amount of cornstarch may need to be adjusted depending on your recipe.

Used to Create Crispy Crust For Food

One of the most common uses for *cornstarch* is to make a crispy crust on fried foods.

Combined with other ingredients like flour, baking powder, and water. It creates an amazing crispy coating that locks in moisture and adds a tasty crunch.

This is especially great for fried chicken, french fries, and other fried dishes.

Used As An Auxiliary For Baked Products

Cornstarch is an important ingredient in many baked foods. It is used as an auxiliary to help with texture, color, taste, and structure. It can also be used to bind ingredients together or thicken a mixture.

Adding it to flour when baking cakes or cookies makes them softer and fluffier. The cornstarch stops the flour from making gluten, which can make the food tough.

Cornstarch also helps breads and rolls have a light texture.

It helps cakes stay in shape when baking. It also keeps them from falling apart when cooled or cut. Cornstarch can make cakes and pastries last longer, and keep their shape and texture.

Cornstarch can also be used to make a sweet glaze for fruits, pies, and tarts or to sprinkle on top of muffins or other pastries.

It creates a glossy finish without adding too much sugar and adds crunchiness as well.

Non-Culinary Uses Of Cornstarch

Aside from food use, cornstarch has many non-culinary uses. It can be used as a natural fabric softener when added to the wash cycle of your laundry.

It can be sprinkled on carpets before vacuuming to help pick up pet hair and other particles.

Cornstarch is also great for beauty purposes. Mix it with water to create a paste, then apply it to the skin as a facial mask or scrub.

It can also be used to remove grease from hair and scalp, or it can be added to shampoos and conditioners for extra shine and volume.

Cornstarch is an affordable and natural product you can buy. It can be used in many ways in the kitchen and around your home.

Get some cornstarch and see all the things it can do! You will be amazed at how helpful it is. Have fun trying new things!


Can Bacteria Grow In Cornstarch?

Yes, cornstarch can get bad. It does not have any preservatives so it can attract mold and bacteria.

But if you keep it dry, the bacteria won’t be able to get to the cornstarch. Take good care of your cornstarch so that it doesn’t go bad!

What Can I Do With Outdated Cornstarch?

It’s okay if your cornstarch is expired. You can still use it to thicken sauces and soups. It also works as a deodorant, nail polish, dry shampoo, and to reduce skin irritation.

Can I Store My Cornstarch In The Fridge?

You don’t need to put Cornstarch in the refrigerator. It won’t help it last longer. But if you do put it in the fridge, make sure you keep it in a container that is closed tight so no air can get inside.

What are the common problems with using cornstarch?

Using too much cornstarch can make a recipe bad. It might be too thick and sticky, or form lumps that don’t mix in. Too much cornstarch can also make a recipe too sweet.

Is cornstarch and Cornflour the same thing?

Corn flour is yellow and made from dried corn. Cornstarch is a white powder that comes from the inside of corn kernels.

The names might be different in some places. Corn flour can be used like other flours and cornstarch is used to thicken things.

What’s healthier cornstarch or wheat flour?

Wheat flour is healthier than cornstarch. It has more protein, fewer carbs, and more fiber. It also has more vitamins and minerals.

Can I use cornflour instead of cornstarch?

Cornstarch and corn flour are not the same. Cornstarch is starchy, while corn flour is made of proteins. You cannot use one instead of the other.

Is corn starch better than flour for frying?

Cornstarch can make your food crunchier than flour. It takes away the moisture from the food and makes it bigger, so your fried food will have a crunchy shell.

Does Cornstarch Go Bad? | Final Thoughts!

To sum up, proper storage and properly understanding how long cornstarch lasts are key elements to ensure that you get optimal results with your kitchen projects!

As this blog post has revealed, you should discard any old or unrefrigerated cornstarch because the health risks are not worth taking. Additionally, you can still use frozen cornstarch even after it becomes a solid-state object.

Remember these tips when using cornstarch. You will be successful and find something useful. Be creative! You can do anything with it!

Dr. Renata Micha

Meet Dr. Renata Micha, a wellness and nutrition expert passionate about helping people live healthier lives through good nutrition. With a diverse academic background in human nutrition and dietetics, she holds a Ph.D. and has worked in various institutes across the US.

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