Studies on the Utilization of Korean Citrus Peel Waste -II. Contents of Pectin, Hesperidin and Naringin-

한국산(韓國産) 감귤과피(柑橘果皮)의 효율적(效率的) 이용(利用)에 관(關)한 연구(硏究) -II. 펙틴, 헤스페리딘, 나린진의 함량(含量)에 관(關)하여-

  • Chang, Ho-Nam (Dept. of Applied Chemistry and Chemical Engineering Korea Advanced Institute of Science) ;
  • Nam, Kyung-Eun (Dept. of Applied Chemistry and Chemical Engineering) ;
  • Hur, Jong-Wha (Dept. of Food Engineering, Jeju National University)
  • 장호남 (한국과학원 화학 및 화학공학과) ;
  • 남경은 (한국과학원 화학 및 화학공학과) ;
  • 허종화 (제주대학 식품공학과)
  • Published : 1977.12.28

Abstract

Pectin, hesperidin and naringin were extracted from hot air-dried peel ($60^{\circ}C$, 1 hr and air velocity 160 fpm) of citrus produced in Korea in order to see the amount of each component contained in the peel. Pectin was extracted by three different methods and the quality and contents of the pectins were determined respectively. 1. The pectin yield by the total pectic substance method was the highest (26.0% for unshiu (U) and 28.5% for natsudaidai (N) expectedly and the soluble pectic substance method the least (13.5%(U) and 15.6% (N)) The yield by method III (extraction by water at pH 1.5 followed by isopropanol precipitation) was intermediate (18.1% (U) and 20.8%(N)). Anhydrouronic acid (AUA) content was the highest (92.0% (U) and 90.3%(N)) in those by method III. The AUA contents of the other pectins were 80.0% for soluble pectin (for both U and N), 71.6% for the commercial pectin (Sunkist Groups Inc., U.S.A.), 58.0%(N) and 63.4%(U) for total pectic substance. 2. The methoxyl content of total pectic substance was the lowest (4.81%(U) and 4.88%(N)). However, there was no significant difference in methoxyl content among the rest which were found to have low levels(5.27-7.20%). 3. The pectin by method III gave the highest jelly strength. The commercial pectin, soluble pectice substance and total pectic substance were next in order. 4. The hesperidin content of unshiu was 5.07% (dry basis) and the naringin content of natsudaidai 3.03% (dry basis).

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