전분질원(澱粉質原料)의 종류를 달리하여 양조(釀造)한 3개월 숙성의 찹쌀, 보리쌀, 밀가루, 고구마의 각고추장을 시료로하여 gas chramatography에 의하여 유기산을 분석한 결과 고추장중의 유기산으로 lactic acid, glycolic acid, pyruvic acid, succinic and fumaric acid, malic acid, pyroglutamic acid, citric acid가 모든 시험고추장에서 분리되었고 oxalic acid는 고구마 고추장에서만 검출 되었다. 시험고추장 모두 pyroglutamic acid, pyruvic acid, citric acid가 양적으로 가장 많았으나 밀가루 고추장에서는 이들 함량이 타 고추장에 비하여 다소 적게 나타났다. succinic과 fumaric acid의 함량은 고구마 고추장에서 가장 많았고 보리쌀 고추장이 가장 적었다.
Organic acids of Kochuzang (red pepper paste) prepared from glutinous rice, polished barley, wheat flour and sweet potato were analyzed by a gas chromatography. Lactic, pyruvic, succinic, fumaric, malic, pyroglutamic and citric acid were identified. And trace amount of oxalic acid was found in the Kochuzang prepared from sweet potato. The dominant organic acid of all samples was pyroglutamic acid, followed by pyruvic and citric acid. The organic acids were lower in Kochuzang from wheat flour than in other samples. The contents of succinic and fumaric acid were highest in Kochuzang prepared from sweet potato and were lowest in polished barley Kochuzang.
