Growth rate,carrageenan yield and gel properties of culturedkappa-carrageenan producing red algaKappaphycus alvarezzi (Doty) Doty in the subtropical waters of Shikoku,Japan |
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Authors: | Masao Ohno Danilo B Largo Takeshi Ikumoto |
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Institution: | (1) Usa Marine Biological Institute, Kochi University, 781-11 Usa-cho, Tosa, Kochi, Japan;(2) Taito Co., Ltd., Tokyo, Japan |
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Abstract: | Kappaphycus alvarezii (Doty) Doty from the Philippines was grown in the subtropical waters of Shikoku Is., Japan (33°2635 N, 133°2500 E). The growth rate, carrageenan yield, viscosity and gel strength were compared to values for plants cultured in the Philippines and between spring-summer, autumn-winter and winter periods in Japan. Maximum daily growth rates up to 8% occurred in Japan in October to November (autumn) while die-back occurred in winter due to low seawater temperature (15 °C). The average growth rate (ca 5%) in spring-summer to autumn was comparable to that in the Philippines. During the winter (December), the daily growth rate was approximately 1%. Gel strength, determined in a 1.5% solution in both water and 0.2% KCl, was 850 g cm-2 and 2000 g cm-2, respectively. Sol viscosity was 890 cP at 75 ° C. These values are quite similar to values obtained in the Philippines. |
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Keywords: | kappa-carrageenan Eucheuma growth rate Japan Kappaphycus alvarezii Phillipines |
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