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ce of strawberries: why do they taste so good?
Each year, spectators at the Wimbledon tennis tournament get through a whopping 30 tons of strawberries in the course of a summer fortnight. It is no wonder that the association between Wimbledon and strawberries is such a marketing triumph. But why do we fall for it?
Scientists have actually worked out what it is we love so much about strawberries by pinning down the molecular basis of the its aroma. This can also explain why wild strawberries often taste better than shop-bought ones. The good news is that the work is helping them uncover how to make them even more delicious.
Strawberries have a long and proud history – even the ancient Romans ate them. We know this from the works of poets Virgil and Ovid, which referred to them as fraga. The medieval artist Hieronymus Bosch had several strawberries in his triptych the “Garden of Earthly Delights”, painted around 1500.
Some 500 years ago, the wood strawberry, Fragaria vesca, was around in Europe and the musk strawberry, Fragaria moschata, was starting to be cultivated. These were what we would recognise today as wild strawberries, characterised by small, misshapen fruit.
The most common type of strawberries we eat today came to us by coincidence via the transatlantic explorations of Christopher Columbus and his successors. First the very hardy Virginia strawberry (Fragaria Virginiana), a native of North America, reached Europe in the 17th century. Then early in the 18th century, the large Chilean strawberry (Fragaria Chiloensis) came to France.
As a result of an initial fortuitous pollination, these two species were crossed, giving rise to the cultivated strawberry we eat today, Fragaria ananassa, sometimes known as the “garden strawberry”. This combined in one fruit two particular traits inherited from its forerunners: hardiness and large fruit.
The chemistry of taste and smell
When I was young – in the 1950s – you only saw strawberries in the shops for a couple of weeks of the summer, roughly coinciding with Wimbledon. Now we have them all the year round.
This is because strawberry breeders have been aiming for fruit with particular (and marketable) properties such as uniform appearance, large fruit, freedom from disease and long shelf-life. But by concentrating on genetic factors that favour these qualities, other genes have been lost, such as some of the genes responsible for flavour.
The balance of sweetness and acidity is very important to the taste of a strawberry. As strawberries ripen, their sugar content rises from about 5% in unripe green fruit to 6–9% on ripening. At the same time, the acidity decreases, meaning ripe strawberries taste much sweeter.
The ripening process is controlled by a hormone called auxin. When its activity reaches its peak, it causes the cell wall to degrade and so a ripe strawberry becomes juicy as well as sweet. At the same time, gaseous molecules from the strawberries make their way up the back of the throat to our nose when we chew on them, where they plug into “smell receptors”.
But how do scientists know which molecules are responsible for taste and smell? More than 350 molecules have been identified in the vapour from strawberries – and around 20 to 30 of those are important to their flavour.
Unlike raspberries, there is no single molecule with a “strawberry smell”. So what we smell is a blend – these molecules together give the smell sensation we know as “strawberry”. Chemists made up a model strawberry juice containing what they thought were the most important odorants, at the same concentration found in the original juice extract. Sensory testers agreed that this model closely matched the real extract.
They then made up a series of new mixtures, each containing 11 of the 12 main odorants, with a different molecule missing from each. The testers could therefore find out if omitting that molecule made any difference to the odour. For example, leaving out 2,5-dimethyl-4-hydroxy-3(2H)-furanone or (Z)-3-hexenal was noticed by virtually all the testers – and omitting compounds known as esters – chemical compounds – such as methyl butanoate, ethyl butanoate or ethyl 2-methylbutanoate were also spotted by most.
This analysis led to the characterisation of basic sensory impressions of strawberries. One of these was a sweet caramel-like scent, which is due to two molecules with a structure containing five-membered rings of carbon atoms called furaneol and mesifuran.
Another impression was a fruity scent, due to the esters, which are responsible for the aroma of many other fruit, including banana and pineapple. They can make up 90% of the aroma molecules from a strawberry. It’s important that the contribution of the esters are balanced – too much gamma-decalactone for example, and the strawberries will start to taste like peaches. The analysis also pinpointed a green note due to (Z)-3-hexenal responsible for the smell of “cut grass”.
Some modern varieties of strawberry are lacking in the quantity and range of molecules. Scientists have analysed wild varieties of strawberries, like the musk strawberry and wood strawberry to find out why.
It turns out that while this fruit may not look so good, it produces a greater quantity of flavour molecules, as well as molecules that are not found in many of the strawberries we buy in the shop. Methyl anthranilate is one of these, it is also found in grapes and contributes a strong and sweetish edge to the aroma. Another is methyl cinnamate with a spicy note.
In their quest for better tasting fruit, scientists are starting to investigate the genes responsible for making particular flavour molecules.
Some 20 years ago, experiments on the effect of adding cream to the flavour of fresh raspberries were carried out. These found that heating enhanced raspberry aroma, but adding cream decreased it.
While this exact experiment does not seem to have been carried out in strawberries, scientists working with the food chain Morrisons recently reported that the perfect strawberry-to-cream weight ratio is 70:30. What’s more, you should eat it within two minutes and 50 seconds of serving, before the strawberries start to get soggy and shrink. Perhaps you should carry out this experiment yourself this summer? Enjoy your strawberries.
Extra Information About do strawberries have a smell That You May Find Interested
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Frequently Asked Questions About do strawberries have a smell
If you have questions that need to be answered about the topic do strawberries have a smell, then this section may help you solve it.
What does strawberries smell like?
This analysis led to the characterisation of basic sensory impressions of strawberries. One of these was a sweet caramel-like scent, which is due to two molecules with a structure containing five-membered rings of carbon atoms called furaneol and mesifuran
What causes strawberry smell?
The characteristic aroma of a fresh strawberry is the result of around a dozen different aroma compounds. One of these plays a particularly important role: HDMF (4-hydroxy-2,5-dimethyl-3(2H)-furanone), which is also known under the brand name Furaneol
Why do my strawberries smell like alcohol?
Old strawberries can get boozy. In the meantime, you might notice an alcohol-y flavor in older strawberries. That happens because cells inside of the strawberry, still living and breathing, can’t get the oxygen they need to keep running the strawberry engine (Yep, oxygen.
What fruit is known for its unique odor?
If you’ve smelled a durian even once, you probably remember it. Even with the husk intact, the notorious Asian fruit has such a potent stench that it’s banned on the Singapore Rapid Mass Transit. Food writer Richard Sterling has written ?its odor is best described as? turpentine and onions, garnished with a gym sock.
Can you get strawberry poisoning?
Berries, whether frozen or fresh, are also a common source of food poisoning, especially strawberries, raspberries, blackberries, and blueberries, all due to harmful viruses and bacteria, especially the virus hepatitis A.
Why do I feel sick after strawberries?
It is possible to be allergic to strawberries, although this allergy is much less common than many other dietary allergies. Having a strawberry allergy means that a person’s immune system reacts badly to a specific protein that is present in this fruit.
When should you not eat strawberries?
Discard strawberries that are: Moldy. Any signs of white or grey mold mean the specimen is spoiled. Bruised, soft, or mushy.
How do you tell if strawberries are spoiled?
Bad strawberries are ones that are mushy, damaged, leaking juice, shriveled or moldy. You should also pass over strawberries that are poorly colored, have large white or green areas or sport dry, brown caps.
Should I refrigerate strawberries?
Fresh strawberries can go directly into the refrigerator, but will do just fine on the counter for a couple of days. Remove any bruised or otherwise marred berries and place the rest in a colander or open-weave basket to allow good airflow.
Why should you wash strawberries before eating them?
Unwashed fresh berries (or any fresh produce) can have dirt, bacteria, or even tiny insects living on or in them, not to mention pesticide residue on the fruit’s skin, which can lead to foodborne illness.
What happens if you eat old strawberries?
This contamina- tion can occur at any point from the field to the table. Eating contaminated strawberries could give you a foodborne illness. Common signs of foodborne illness include nausea, vomiting, diarrhea, headaches and fever. These signs usually appear within 12 to 72 hours, and they can be serious.