Liam Carter
Sourdough starters can emit a wide range of aromas, from floury to ripe/sweet to beer/wine-like. However, when a sourdough starter begins to smell like nail polish remover, it is a sign that 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. High acidity levels in the starter can lead to problems such as slow fermentation and flat loaves. To fix this issue, you can feed your starter more frequently, adjust the temperature to reduce stress on the yeast, or use methods to de-acidify your starter.
| Characteristics | Values |
|---|---|
| Cause | The yeast and bacteria that fuel the fermentation process are out of balance, specifically when there's an excess of bacteria producing acetic acid. |
| Occurrence | It can occur in any phase of the feeding cycle and can be caused by various factors. |
| Temperature | Extreme temperatures can stress the yeast and bacteria, leading to the production of acetone. The ideal temperature for the starter is between 68°F to 75°F (20°C to 24°C). |
| Feeding | The starter may not be fed enough or often enough. For room-temperature starters, feeding once every 12 to 24 hours is ideal. |
| Other Factors | The starter may be too wet, too acidic, or lacking oxygen. |
| Solutions | Feed the starter more often, reduce water, de-acidify, and stir to add oxygen. |
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What You'll Learn
The starter is hungry and needs to be fed more often
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.
If your starter smells like nail polish remover, it is likely hungry and needs to be fed more often. A hungry starter is one of the most common reasons for this smell. To remedy this, feed your starter with equal parts flour and water. The amount you feed it will depend on how much starter you have. For example, if you have about 1 cup of starter, feed it 1/2 cup water and 1/2 cup flour. The consistency should be similar to pancake batter. Cover with a glass lid or tea towel and leave for 12 hours. If your kitchen is particularly warm, you may need to feed your starter twice a day to prevent the acetone smell. Aim to feed it once in the morning and once at night, though the schedule is flexible.
If feeding your starter does not resolve the acetone smell, try moving it to a cooler location. Extreme temperatures can stress the yeast and bacteria, leading to unwanted byproducts like acetone. If your kitchen is very warm, find a cooler spot for your starter or store it in the refrigerator. Feeding a refrigerated starter once a week should be sufficient. It may take a few days for your starter to recover, but it should eventually return to its normal aroma.
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The starter is kept in conditions that are too warm
If your sourdough starter smells like nail polish remover, it's 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 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). For a starter kept at room temperature, feeding it once every 12 to 24 hours is ideal. If the temperature is particularly warm, you might need to feed it twice a day.
If your starter is kept in a warm environment, it may be starving and need to be fed more often. Try feeding it twice a day and if it's too stiff, add more water. 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 if your starter smells very strong and foul, it may be because bad bacteria have overwhelmed the good ones. You can try to resuscitate it by feeding it, but if the smell persists, you may need to start over.
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The starter is too acidic
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.
If your starter is too acidic, it means that there is an excess of bacteria producing acetic acid. This can happen if your 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. Therefore, it is important to keep your starter at the ideal temperature, which is between 68°F to 75°F (20°C to 24°C). 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.
To fix a too-acidic starter, you can use a high feeding ratio (e.g., 1:5:5 or 1:10:10) or do a few rounds of “peak-to-peak” feeding. 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.
If your starter smells like nail polish remover, it could also be a sign that it is hungry and needs to be fed more often. Feed it twice a day and if it’s too stiff, add more water. For a starter kept at room temperature, feeding it once every 12 to 24 hours is ideal. If it’s particularly warm, you might even need to feed it twice a day.
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 nail polish remover, don't worry, as the acetone smell and taste will disappear during the baking process.
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The starter is too wet
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 convert into acetone, especially if the starter is not being fed regularly or is kept in conditions that are too warm.
If your starter is too wet, it could be because you are adding too much water when feeding it. The general "recipe" is a guideline, and you should adjust it according to your specific starter. If your starter is too stiff, you can add more water, but if it is too wet, you should reduce the amount of water you are adding.
Another reason your starter may be too wet is that you are not discarding enough of the old starter before feeding. During each feeding, you should 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.
If your starter is too wet, it can also affect the smell by impacting the fermentation process. A wetter starter may be more prone to extreme temperatures, which can stress the yeast and bacteria, leading to the production of acetone. Try to find a cooler spot for your starter or consider storing it in the refrigerator, which slows down the fermentation process.
Finally, the type of flour you are using may also affect the wetness of your starter. Different types of flour absorb water at different rates, so the amount of water you need to add will vary depending on the flour you are using. Make sure to adjust the amount of water accordingly to achieve the desired consistency.
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The starter lacks oxygen
If your sourdough starter smells like nail polish remover, it is likely producing a substance called acetone. This can occur 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.
One possible reason why your starter might be producing acetone is that it lacks oxygen. This can happen if the starter is kept in a sealed container without enough ventilation, or if it is stored in a location with poor air circulation. To address this issue, try stirring your starter to introduce more oxygen and ensure it is stored in a well-ventilated container and area.
In addition to addressing the oxygen levels, there are several other steps you can take to fix an acetone-smelling starter:
- Feed your starter more frequently: A hungry starter can sometimes produce acetone. Try feeding it twice a day or using a high feeding ratio (e.g., 1:5:5 or 1:10:10) to dilute the acids and help rebalance the yeast and bacteria populations.
- Adjust the temperature: Extreme temperatures can stress the yeast and bacteria, leading to acetone production. Keep your starter at an ideal temperature between 68°F to 75°F (20°C to 24°C) or consider storing it in the refrigerator to slow down the fermentation process.
- De-acidify your starter: High acidity levels can cause problems in sourdough loaves. Try de-acidifying your starter by doing a few rounds of “peak-to-peak” feeding, discarding most of the starter before feeding it to reduce the overall acidity.
- Refresh your starter: If the acetone smell persists, you may need to refresh your starter by taking a small amount of the old starter and adding it to a new batch with fresh flour and water. This will help dilute any unwanted byproducts and restore balance to your starter.
Remember, it is quite common for sourdough starters to have a slight acetone smell, especially if using rye flour. This smell usually disappears with a refresh, and acetone has a very low boiling point, so it will evaporate during the baking process. However, if the smell is strong and persistent, take the above steps to address the issue and restore your starter to a healthy state.
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