There are several methods to prevent or slow down enzymatic browning in fruit. __3__ This lowers the pH level of the fruit tissue, causing the PPO to be far less active. Another method is to store the fruit in an airtight container or to wrap it tightly with plastic wrap. Doing this will reduce its exposure to oxygen. __4__
Although fruit that has undergone enzymatic browning may look less appealing, it is still safe to eat. However, by using one of these simple methods, you can enjoy fresh-looking fruit for a longer period.
有一些方法能避免或減緩水果的酶促褐變。其中一個有效的方式就是在切片水果的表面塗上酸性物質，像是檸檬汁或醋。這樣做能降低水果組織的酸鹼值，讓 PPO 更不為活躍。另一個方式是將水果存放在密封的容器內，或用保鮮膜將其緊緊包住。這樣做會減少水果與氧氣的接觸。快速蒸一下切片水果或將其短暫浸泡在滾水中也能使PPO失去活性，並終止 PPO 與空氣的作用。
Photo: Shutterstock I 照片：Shutterstock
雖然經歷酶促褐變的水果可能看起來較不吸引人，但仍然可以安全食用。然而，藉由採用這些簡單方法中的其中一個，你就能在更長的一段時間享用看起來新鮮的水果。
What Did You Learn?
(A) Therefore, the bruised parts turn brown and in turn affect the entire fruit.
Photo: Shutterstock I 照片：Shutterstock
(B) When the fruit is cut, the PPO inside it reacts with the oxygen in the air.
(C) One effective way is to coat the surface of the sliced fruit with an acidic substance, such as lemon juice or vinegar.
(D) Quickly steaming the sliced fruit or briefly dipping it in boiling water can also inactivate the PPO and stop its reaction with air.
參考答案
1. (B)
2. (A)
3. (C)
4. (D)
Word in Use
4. transform vt. 使改變
transform A into B 將 A 變成 B
The amusement park has transformed the small town into a famous tourist spot.
那座遊樂園把該小鎮轉變為一個旅遊景點。
5. prevent vt. 避免，預防
Frequent communication can prevent misunderstandings.
經常溝通可以避免誤會。
Practical Phrases
3. come into contact with...
接觸到……
Pets could be at risk of rabies if they come into contact with an infected wild animal.
如果寵物接觸到患有狂犬病的野生動物，就可能有被感染的風險。
＊rabies n. 狂犬病
4. slow down... / slow... down
減緩∕放慢……
It is difficult to answer the question of whether we should slow down the progress of AI or not.
我們是否要減緩人工智慧的進步是個很難回答的問題。
化學小筆記
聽文章朗讀及講解: https://ivy.pse.is/455bfu
本文出自常春藤解析英語雜誌: www.ivy.com.tw
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