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Title: Effect of alkali treatment on the yield and quality of agar from red alga Gracilaria verrucosa (Rhodophyta, Gracilariales) occurring at different salinity gradient of Chilika lake
Authors: Rath, J.
Adhikary, S.P.
Keywords: Gracilaria verrucosa
Chilika lake
Agar agar
Alkali treatment red alga
Salinity
Issue Date: Jun-2004
Publisher: CSIR
IPC CodeInt. Cl. ⁷ C08B 37/12
Abstract: Gracilaria verrucosa was collected at salinity gradient of 4.2 to 28 ppt in the Chilika lake was used for agar extraction. Agar yield of 27-30% with gel strength 165 to 180 g/cm² was obtained from the alga occurring at two different locations of Southern sector of the lake showing salinity 6.5 to 8.0 ppt. NaOH pre-treatment strongly influenced the agar characteristics. Alkali pre-treatment of Gracilaria verrucosa yielded agar with increased gel strength but the yield was lowered. With 10% alkali pre-treatment the sulphate content of agar was reduced together with increase in 3,6,-anhydro galactose content and the gel strength. Using Gracilaria verrucosa from salinity ranges 6.5 to 8.0 ppt of Chilika lake and extraction with 10% alkali, good quality of agar with gel strength of 265 to 275 g/cm² and moderate yield of 25 to 26% was obtained suggesting its potential for commercial exploitation.
Page(s): 202-205
ISSN: 0379-5136
Source: IJMS Vol.33(2) [June 2004]

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