Sophia Delgado
If your sourdough starter smells like nail polish remover, it's likely producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there's an excess of bacteria producing acetic acid. As the acetic acid builds up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm. This can be remedied by feeding your starter more often and storing it in a cooler location.
| Characteristics | Values |
|---|---|
| Cause of the nail polish remover smell | The yeast and bacteria that fuel the fermentation process are out of balance, leading to an excess of acetic acid-producing bacteria. |
| How to fix it | Feed the starter more often, especially if it is hungry. Adjust the temperature to between 68°F to 75°F (20°C to 24°C) and consider storing it in the refrigerator. |
| Other possible reasons | The starter lacks oxygen, extreme temperatures, or the type of flour used (e.g., rye flour). |
| When to discard | If there is mold or discoloration on the starter, or if the smell persists after refeeding, consider starting over. |
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What You'll Learn
Acetone is produced when there is an excess of bacteria
If your sourdough starter smells like nail polish remover, it is likely producing a substance called acetone. Acetone is produced when there is an excess of bacteria, specifically when the yeast and bacteria that fuel the fermentation process are out of balance. This imbalance results in the overproduction of acetic acid by the bacteria. As the levels of acetic acid build up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
To rectify this issue, it is important to address the imbalance between the yeast and bacteria populations. This can be achieved by diluting the acids, which will help to restore balance. During each feeding, discard about half of your starter before adding fresh flour and water. For a starter kept at room temperature, feeding it once every 12 to 24 hours is recommended. However, if the room temperature is on the warmer side, you might need to feed it twice a day. An ideal temperature for your starter is between 68°F to 75°F (20°C to 24°C).
If you are concerned about the high acidity levels in your starter, you can employ a high feeding ratio, such as 1:5:5 or 1:10:10. Alternatively, you can perform multiple rounds of ""peak-to-peak" feeding, which involves discarding a portion of the starter and replenishing it with fresh flour and water. This process helps to control the acidity and prevent issues such as gummy crumb, slow fermentation, flat loaves, weak oven-spring, and premature overproofing.
It is worth noting that acetone has a very low boiling point, and it will evaporate during the baking process. This means that even if your starter smells strongly of acetone, the baked bread is unlikely to retain this odour. Additionally, the acetone smell could simply be a sign that your starter is hungry, so increasing the feeding frequency may resolve the issue.
If the acetone smell persists despite your efforts to rebalance the yeast and bacteria, it may be necessary to start over with a new starter. However, don't be discouraged, as sourdough starters are resilient and challenging to kill accidentally.
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High acidity levels can be controlled by using a high feeding ratio
If your sourdough starter smells like nail polish remover, it is producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there is an excess of bacteria producing acetic acid. As the acetic acid builds up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
High acidity levels in your starter can be controlled by using a high feeding ratio. A high feeding ratio will help knock down the acidity of your starter with one large feeding. The most common "high feeding ratios" are 1:5:5 and 1:10:10. These ratios are measured in terms of starter, flour, and water. For example, a 1:5:5 ratio with approximately 150g of starter would translate to 15g of carryover starter, 75g of flour, and 75g of water. A high feeding ratio will take longer to peak than your normal feeding ratio. If your starter still smells acidic after one feeding, you can repeat a second high-ratio feeding.
If this does not work, you can try the Peak-to-Peak method. With this method, you ignore the clock and watch your starter's activity, then discard and feed your sourdough starter as it is peaking. The interval between feeding and peaking should shorten as the starter strengthens, so it is impossible to establish a fixed feeding time with this method. It is recommended to use very small quantities of starter in this method because most of it will be discarded.
Acidic starters can cause problems in sourdough loaves, such as gummy crumb, slow fermentation, flat loaves, weak oven-spring, and premature overproofing. High acidity levels can also choke off the yeast's production of carbon dioxide and limit its ability to produce offspring. Therefore, it is important to control your starter's acidity.
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The smell can be caused by extreme temperatures
If your sourdough starter smells like nail polish remover, it is producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there is an excess of bacteria producing acetic acid. As the acetic acid builds up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
Extreme temperatures can stress the yeast and bacteria, leading to unwanted byproducts like acetone. If your kitchen is very warm, try to find a cooler spot for your starter or consider storing it in the refrigerator, which slows down the fermentation process significantly. An ideal temperature for your starter is between 68°F to 75°F (20°C to 24°C).
If your starter is kept at room temperature, feeding it once every 12 to 24 hours is ideal. If it's particularly warm where you are, you might need to feed it twice a day. During each feeding, discard about half of your starter before adding fresh flour and water. This process dilutes the acids and helps to rebalance the yeast and bacteria populations.
It's important to note that acetone has a very low boiling point, and it will turn into a gas and evaporate in the oven when the loaf is baked. So, if your starter smells like acetone, it doesn't necessarily mean something is wrong, and the smell should disappear when you refresh your starter.
However, if the smell persists, it could be a sign that your starter is hungry and needs to be fed more often. Try adding a small amount of flour and water without discarding any of the starter first. If that doesn't work, you can try a high feeding ratio, such as 1:5:5 or 1:10:10, or a few rounds of \"peak-to-peak\" feeding, where you discard about half of the starter before adding fresh flour and water.
If the acetone smell is very strong or persists after refeeding, it may be a sign that bad bacteria has overwhelmed the good bacteria. You can try to resuscitate your starter by scraping off any mould or hardened starter and discarding any excess liquid. Then, take a small amount of the old starter and add it to a clean jar with fresh flour and water. However, if the smell continues, you may need to start over with a new starter.
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The acetone smell could mean the starter is hungry
If your sourdough starter smells like nail polish remover, it is likely producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there is an excess of bacteria producing acetic acid. As the acetic acid builds up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
The acetone smell could mean that your starter is hungry and needs to be fed more often. Try feeding your starter twice a day, or even more frequently if it is particularly warm where you are. During each feeding, discard about half of your starter before adding fresh flour and water. This process dilutes the acids and helps to rebalance the yeast and bacteria populations. An ideal temperature for your starter is between 68°F to 75°F (20°C to 24°C).
If your starter is kept at room temperature, feeding it once every 12 to 24 hours is generally recommended. However, if your starter continues to smell like acetone even after regular feedings, it may be a sign that something else is wrong. It could be that your starter is not getting enough oxygen, in which case you should try stirring it more frequently.
It's important to note that acetone has a very low boiling point, and it will turn into a gas and evaporate in the oven when the bread is baked. So even if your starter smells strongly of acetone, it is unlikely that your bread will taste or smell like acetone.
If your starter develops mould or discolouration, it is probably time to throw it out and start over. However, if there is only a small amount of mould, you can try scraping it off and feeding your starter as normal.
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The starter may have been neglected
If your sourdough starter smells like nail polish remover, it is likely producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there is an excess of bacteria producing acetic acid. As the acetic acid builds up, it can start to convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
Additionally, consider the humidity of your environment. In more humid climates, your starter may require less water, while in drier climates, you may need to add more water to your feedings. Adjust the feeding amounts accordingly, paying attention to the consistency and needs of your starter.
If your starter has been neglected for an extended period, it may have developed mould or hardened, and you may need to take more intensive action. Start by scraping off any mould or hardened starter from the surface. Then, pour off any excess liquid, as this liquid is likely to contain high levels of acetic acid and contribute to the nail polish remover smell.
After removing the excess liquid, take a small amount of the remaining starter from the bottom, where it is more protected from mould and bacteria, and transfer it to a clean jar. Feed this new starter with a higher ratio of flour and water, such as a 1:5 or 1:10 ratio, to dilute the acids and help rebalance the yeast and bacteria.
With consistent care and feeding, your starter should recover and return to its normal, pleasant aroma within a few days. Remember, it is quite resilient and challenging to kill, so don't be afraid to experiment with different feeding ratios and techniques to find what works best for your starter.
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Frequently asked questions
If your sourdough starter smells like nail polish remover, it is producing a substance called acetone. This occurs when the yeast and bacteria that fuel the fermentation process are out of balance, specifically when there is an excess of bacteria producing acetic acid.
To fix a sourdough starter that smells like nail polish remover, you can try feeding it more often, using a higher feeding ratio, or storing it in a cooler spot or in the refrigerator to slow down the fermentation process.
It is generally not recommended to eat a sourdough starter that smells like nail polish remover, as it indicates an imbalance in the yeast and bacteria. However, the acetone smell will usually burn off during the baking process, and you can try to fix your starter by feeding it more often or adjusting the temperature. If the smell persists, you may need to start over with a new starter.
