In this paper, 18 red pepper samples were grown under different field conditions (without and with irrigation) and analyzed regarding their phytochemical composition and antioxidant activity. The total phenols content (TPC), determined according to the Folin–Ciocalteu method, varied from 485.36 to 601.19 mg/100 g dry matter (DM), while the total flavonoids content (TFC), determined by aluminum chloride colorimetric assay, varied from 301.68 to 493.14 mg/100 g DM. Antioxidant activity was assessed by 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) scavenging capacity and ranged from 1.85 to 2.95 mg/ml. Regarding average yield, without irrigation, it was 15.50 t/ha, while with irrigation it was 17.70 t/ha. The antioxidant activity of the samples was predicted by applying multiple linear regression (MLR) based on their chemical composition. The rule for allocating red pepper samples of an unknown group to the correct group of samples (those without irrigation and those with irrigation) was established applying linear discriminant analysis (LDA).

中文翻译：

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选定红辣椒品种的理化和抗氧化活性变化—化学计量法

在本文中，在不同的田间条件下（无灌溉和有灌溉）种植了18个红辣椒样品，并对其植物化学成分和抗氧化活性进行了分析。根据Folin–Ciocalteu方法测定的总酚含量（TPC）在485.36至601.19 mg / 100 g干物质（DM）之间，而通过氯化铝比色法测定的总黄酮含量（TFC）从301.68至493.14 mg / 100 g DM。抗氧化活性通过2,2-二苯基-1-吡咯并肼（DPPH）清除能力评估，范围为1.85至2.95 mg / ml。关于平均产量，不灌溉时为15.50吨/公顷，而灌溉时为17.70吨/公顷。通过基于其化学成分的多元线性回归（MLR）预测样品的抗氧化活性。