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The yield, physical, and chemical properties of agars from two Philippine red seaweeds,  Gracilaria eucheumoides  and  Gelidiella acerosa , were investigated on a bimonthly basis. The yield of agar from  Gracilaria eucheumoides  was at a maximum during the early rainy season (May, 29%) and at a minimum during the summer month of March (20%). In  Gelidiella acerosa , a peak in agar yield was also recorded in May (21%), with generally higher yields recorded during the rainy than in the dry season. Agar gel strengths fluctuated from 225 to 430 g cm −2  and from 160 to 820 g cm −2  for  Gracilaria eucheumoides  and  Gelidiella acerosa , respectively, and both agars exhibited strongest gels in July. Significant seasonal variations were observed in the gelling and melting temperatures of agar from  Gracilaria eucheumoides , but not from  Gelidiella acerosa . Sulphate content only varied slightly in agar samples from  Gracilaria eucheumoides , while a higher sulphate content was found in  Gelidiella acerosa  agar during the dry season. Moreover, the sulphate content in  G. acerosa  agar fluctuated inversely with the 3,6-anhydrogalactose content. A FT-IR analysis showed a fairly constant spectrum for temporal  Gracilaria eucheumoides  agar while peaks attributed to S–O vibrations intensified in  Gelidiella acerosa  samples which were recorded to contain high sulphate residues and possess low gel strengths. Diagnosis of the FT-IR spectra in the 1000–400 cm −1  frequency range was also conducted in comparison with agarose and  Gracilaria chilensis  agar.

botanica marina

Seasonal Variations in the Yield, Gelling Properties, and Chemical Composition of Agars from  Gracilaria eucheumoides  and  Gelidiella acerosa  (Rhodophyta) from the Philippines