There are numerous fruits that are acidic, and the most common acids found in fruits are probably citric acid and oxalic acid. Fruits such as oranges and lemons are well known for their citric acid content, but there are plenty of other citrus fruits as well. These include pomelos, key limes, citrons, grapefruit, tangerines, other varieties of oranges such as the Mandarin orange, and several varieties of Australian and other limes. Most berries are rich in oxalic acid, but star fruit is usually said to contain much higher amounts of the acid. Beetroot also contains a lot of oxalic acid, and although it is not really a fruit, it is often consumed in the form of a juice, and is therefore worth mentioning. In the same way, tomatoes too are highly acidic, and although they are usually considered to be vegetables, they are often used to prepare juice. Pineapples and avocados are two other acidic fruits - they contain considerable amounts of pantothenic acid, which is essentially vitamin B5. If you want to avoid consuming acidic fruit juices, you should avoid juices made from these fruits and vegetables. Most other common fruits contain little or no acid.
However, you have not mentioned why you are looking for fruit juices with low acid content. People suffering from "acidity" (technically called acid indigestion), acid reflux (gastroesophageal reflux disease or GERD), or other conditions causing heartburn often try to avoid acidic foods, but this is not necessarily the best way to manage these conditions. Completely abstaining from such a wide range of fruits is not advisable, as they provide many nutrients that are essential for your health. In addition, there are much more effective ways of managing these conditions. If you find that acidic foods irritate or aggravate your condition, you should consume them in smaller amounts. If anything is to be avoided, it is drinks such as coffee and alcohol, which unnecessarily contribute to acidity without providing any real nutrition.
However, this rule applies to consumption of food in general - it is advisable to eat several small meals over the course of the day, instead of two or three large meals that increase the chances of indigestion and heartburn. Other simple measures, such as elevating the head of your bed and generally maintaining a healthy, upright posture, can also help to manage GERD. You should find out exactly what you are suffering from and ask your doctor for guidance on how to adjust your lifestyle to manage the condition.
answered by G M