Antibiotics from Algae XXXIII[1]: Phlorotannins of the Brown Alga Himanthalia elongata [2] ^, [3]

Abstract

It is possible to obtain approximately 0.2% (relative to dry weight) phenols soluble in ethyl acetate from Himanthalia elongata. After removal of a fraction containing high-molecular weight substances, a total of 17 oligomeric phlorotannins with 2 to 8 aromatic rings can be isolated from the mixture of the acetylated phenol fraction. Apart from 2 derivatives belonging to the fucol group, diphlorethol and a tetraphlorethol not yet fully identified, all the other substances are fucophlorethols. Amongst these substances, a phenoxylated therphenyl derivative and several fucophlorethols with two-fold phenoxy-substituted biphenyl moieties were identified for the first time.

1 For Part XXXII see: Ref.(11)

2 dedicated to Prof. Dr.M. Steiner on his 80^th birthday

3 Part of dissertation Große-Damhues (1983) Bonn

1 For Part XXXII see: Ref.(11)

2 dedicated to Prof. Dr.M. Steiner on his 80^th birthday

3 Part of dissertation Große-Damhues (1983) Bonn