Black Plum is primarily used in three sectors: Traditional Chinese Medicine (TCM) for its astringent properties, the Food & Beverage industry for producing 'Suanmeitang' (Sour Plum Drink), and the Health Supplement market. For food-grade applications, the fruit must meet pesticide residue limits (e.g., EU or FDA standards). For medicinal use, it should comply with Pharmacopoeia standards (such as CP, JP, or USP), specifically regarding the concentration of citric acid, which should typically be no less than 15%.