Why are purple sweet potatoes bitter? Is it better to store purple sweet potatoes in the refrigerator or at room temperature?

Purple sweet potato, also known as black sweet potato, purple sweet potato, purple sweet potato, has high nutritional value, containing vitamins, amino acids, zinc, iron, phosphorus and more than 10 kinds of mineral elements. Purple sweet potato, also known as black sweet potato, purple sweet potato, purple sweet potato, has high nutritional value, containing vitamins, amino acids, zinc, iron, phosphorus and more than 10 kinds of mineral elements. Purple sweet potato is purple because it contains a lot of anthocyanins. The following encyclopedia knowledge network introduces whether purple sweet potato is a genetically modified food? Why is purple sweet potato bitter? Is it better to store purple sweet potato in the refrigerator or at room temperature.

Contents of this article

1. Is purple sweet potato a genetically modified food?

2. Why are purple sweet potatoes bitter?

3. Is it better to store purple sweet potatoes in the refrigerator or at room temperature?

Is purple sweet potato a genetically modified food?

Purple sweet potatoes are not genetically modified foods, but natural varieties. Purple sweet potatoes are purple because they contain a lot of anthocyanins. The "Chinese Sweet Potato Cultivation" published in 1984 also clearly pointed out that the color of sweet potatoes can be divided into purple, orange, apricot yellow, yellow, white and other colors. It can be seen that the purple color of sweet potatoes is the result of natural cultivation, which is not surprising.

Purple sweet potatoes are actually the same as today's purple corn, black corn, black peanuts, and black wolfberries, and are all naturally bred.

The anthocyanins contained in purple sweet potatoes are soluble in water, so the purple sweet potatoes will lose color when boiled in water. Moreover, they will change color due to different pH values: anthocyanins are purple in a neutral environment, blue-green in an alkaline environment, and purple-red in an acidic environment.

Purple sweet potatoes are rich in anthocyanins, a natural antioxidant that has a free radical scavenging ability that is 20 times that of vitamin C and about 50 times that of vitamin E.

Why are purple sweet potatoes bitter?

1. Moldy and deteriorated

Purple sweet potatoes are bitter because their skin has deteriorated. After steaming, purple sweet potatoes taste sweet and have no bitterness. However, moldy and deteriorated purple sweet potatoes will breed a large amount of harmful substances and other impurities, which will cause the purple sweet potatoes to taste bitter when eaten.

2. Check before eating

You need to check the skin of purple sweet potatoes before eating them. Purple sweet potatoes are generally purple or lavender in color. If black spots or white mold appear on the skin, it means that the sweet potatoes have become moldy and spoiled. In addition, if the purple sweet potatoes are soft when kneaded, it means that the material structure has changed, so do not continue to eat them.

3. Saving method

When storing purple sweet potatoes, they must be kept in a ventilated and dry environment to prevent excessive moisture in the air from causing bacteria to grow on the surface of the purple sweet potatoes. At the same time, they must avoid direct sunlight on the purple sweet potatoes to prevent the temperature of the purple sweet potatoes from rising and accelerating their deterioration. Therefore, the storage temperature must not be too high.

Is it better to store purple sweet potato in the refrigerator or at room temperature?

If the climate is dry, it is better to store the purple sweet potato in the refrigerator to prevent a large amount of water loss. If the indoor temperature is suitable, it is better to store the purple sweet potato in a cool, ventilated and room temperature environment. If the purple sweet potato is stored in the refrigerator, make sure there is no moisture on the surface, and it is best to wrap it with newspaper.

If purple sweet potatoes are not stored properly, they will grow small sprouts. You can pick off the sprouts and continue to eat them, but the taste may deteriorate.

As long as the temperature and humidity can be controlled well, purple sweet potatoes can generally be stored at room temperature for about a few months, and the sugar content will increase slightly with the increase of storage time.

Purple sweet potato, also known as black potato, purple-heart sweet potato and purple-fleshed sweet potato, has high nutritional value and contains vitamins, amino acids, and more than 10 mineral elements such as zinc, iron, and phosphorus.