ABSTRACT

Three pineapple cultivars smooth cayenne, Tainung 17, and Tainung 19 were processed into flesh, peel, and stem. Nine samples were analyzed for their proximate compositions and bromelain activity existed in their water extracts. Pineapple fleshes were rich in reducing sugars and soluble fiber whereas peel and stem were rich in crude fiber. Stem showed higher bromelain activity (102–247.3 U/mg). All 18 samples including water and ethanol extracts were quite effective in the scavenging ABTS⁺- and DPPH-radical activities and reducing power as evidenced by their low EC₅₀ (0.98–15 mg/mL). Water extracts of stem were more effective than their ethanol extracts. The scavenging ABTS⁺-radical ability was highly related with total phenols and flavonoids. Overall, peel and stem of pineapple showed high amounts of reducing sugars and soluble fiber, and higher bromelain activity and exhibit effective antioxidant activities. These wastes of pineapple would be utilized to develop as a sweet supplement or functional product.

摘要

三个菠萝品种光滑辣椒，台农 17 和台农 19 被加工成果肉、果皮和茎。分析了九个样品的近似组成和它们的水提取物中存在的菠萝蛋白酶活性。菠萝肉富含还原糖和可溶性纤维，而果皮和茎富含粗纤维。茎表现出更高的菠萝蛋白酶活性（102-247.3 U/mg）。包括水和乙醇提取物在内的所有 18 种样品在清除 ABTS ⁺ - 和 DPPH 自由基活性和还原能力方面都非常有效，其低 EC ₅₀ (0.98–15 mg/mL)证明了这一点。茎的水提取物比乙醇提取物更有效。清除 ABTS ⁺-自由基能力与总酚和类黄酮高度相关。总体而言，菠萝的果皮和茎部显示出大量的还原糖和可溶性纤维，以及更高的菠萝蛋白酶活性和有效的抗氧化活性。这些菠萝废料将被用于开发甜食补充剂或功能性产品。