|Title:||離子對仙草膠熱可逆性質之影響||Other Titles:||Effect of Ions on the Heat Reversible Characteristics of Hsian-tsao gel||Authors:||史宏財
Horng- tsair Shih
|Keywords:||仙草膠;熱可逆性;凝膠;離子;製罐;Hsian Tsao;Heat Reversible;Gel Formation;Ion;Canning||Issue Date:||Aug-1997||Publisher:||農業試驗所||Start page/Pages:||239-251||Source:||農業試驗所特刊;第74號||Conference:||1997特用作物試驗成果研討會專刊
Proceedings of A Symposium on the Experimental Results of Special Crops 1997
Dissolve of hsian-tsao gel subjected to heat treatments were examined. Hsiantsao gel in 0.8 cubic centimeter were dipped into the lithium, sodium, potassium, ammonium,calcjum, magnesium, and barium chloride solutions at the concention ranged from 0.02 to 2.0%, respectively, and thos metal ions were also added directly to the 1.2oBrix diluted hsian-tsao extract,those gel strength were measured then after wheat starch were added and gelatinized under 100 ℃ ,60 minutes and 121 ℃ ,15 minutes boiling. The results indicated that dipping in high concentration of cation solution not only inhibited the gel dissolution occurrence but also increased the gel strength of hsian-tsao. Calcium cation was the most effectively reagent to inhibit the gel dissolution among those ion treatments. Direct addition of cation to the diluted hisan-tsao extract showed the inhibition of gel formation when lithium, sodium ion concentration were above 800, 2,000 ppm,respectively, and the potassium, rubidium, ammonium ion were above 3,000 ppm. The same effect of alkali earth metal ion on gel formation was also noted when the concentration for beryllium, magnesium, calcium, strontium, and barium ion were above 40,60,60,100,100 ppm,respectively. Thus, during the extraction and canning, precaution should be taken to the water quality and dosage of sodium carbonate. In addition, in order to prevent the gel dissolution, 0.04 % to 0.06 % calcium chlorides solution could be applied.
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