Abstract
Red pepper, as an ingredient of Kimchi, is an important horticultural crop in Korea, and capsaicinoid content is a major factor determining the pungent quality of red pepper. To clarify the factors affecting capsaicinoid content, 122 red pepper samples of 24 varieties were collected from 21 cultivation sites in Cheongyang area, South Korea, and their nordihydrocapsaicin (NDC), capsaicin (CAP), and dihydrocapsaicin (DHC) contents were evaluated by using an HPLC. The average content of NDC, CAP, and DHC were 4.8, 74.2, and 26.5 mg/100 g, respectively, and its relative composition ratios were slightly affected by variety or cultivation places. In most cultivation places, capsaicinoid contents showed significant dependence upon variety, in that cv. WangJangKum (225.5 mg/100 g) exhibited 6.2-fold higher total capsaicinoid contents when compared to cv. ChonHaTongIl (36.2 mg/100 g). Even the same cultivar (e.g., WangDaeGum) exhibited almost 2-fold variations according to cultivation places, indicating the dependence of capsaicinoid content of red peppers upon the cultivation sites. Analysis of variance revealed significant variety–cultivation place interactions in CAP, DHC, and total capsaicinoid contents, but not in NDC. This data suggests the necessity of more-careful selection of variety and cultivation place corresponding to the expected pungency of harvested red peppers.
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