Extraction Yield and Quality Attributes of Agar from Domestic Seaweeds According to Various Pretreatments

국산원조(國産原藻)의 전처리(前處理)과정에 따른 한천(寒天)의 수율(收率) 및 품질특성(品質特性)

  • Lee, Su-Rae (Agricultural Biochemistry Laboratory, Korea Atomic Energy Research Institute) ;
  • Cho, Han-Ok (Agricultural Biochemistry Laboratory, Korea Atomic Energy Research Institute) ;
  • Park, Sang-Ki (Agricultural Biochemistry Laboratory, Korea Atomic Energy Research Institute)
  • 이서래 (한국원자력연구소 농업생화학연구실) ;
  • 조한옥 (한국원자력연구소 농업생화학연구실) ;
  • 박상기 (한국원자력연구소 농업생화학연구실)
  • Published : 1975.09.28

Abstract

Domestic seaweeds Gracilaria verrucosa collected from coastal areas of Namhae, Wando and Yeosoo, Korea were subjected to the examination of yield and quality of agar prepared according to various pretreatment conditions. In alkali treatment at high temperature, higher alkali concentration for one-hour period at $90^{\circ}C$ gave rise to higher yield of agar. In acid treatment, higher yield was obtained by higher acid concentration and longer treating period. Alkali treatment at room temperature gave rise to a slightly decreased yield at higher alkali concentration and longer treating time. Total nitrogen and crude ash of agar samples were greatly decreased by pretreatments. Jelly strength, gelation ability, gelation point and viscosity of agar samples tended to increase as the alkali-treating condition of seaweed became stronger. It was shown that sulfur content of agar had a high negative correlation with jelly strength of its gel. Various alkali treatments of seaweed at room temperature showed no marked difference in agar quality and did not exhibit any good effect comparable to alkali treatment at high temperature.

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