PubMed Health⌕ Search

Biomedical subjects

J S Craigie

Publications and source records attributed to J S Craigie.

5 recordsLinked to original sources
PubMed1977

The occurrence and seasonal variation of gigartinine and L-citrullinyl-L-arginine in Chondrus crispus Stackh.

Gigartinine, 5-(3-amidinoureido)-2-aminovaleric acid, and L-citrullinyl-L-arginine were islated from aqueous extracts of Chondrus crispus (Rhodophyceae). Their identifications were confirmed by chemical procedures, and 1H and 13C nuclear magnetic resonance and infrared spectroscopic methods. Citrullinylarginine, gigartinine, taurine, citrulline, and glutamic acid were the predominant free amino compounds. Citrullinylarginine showed the most pronounced change in concentration. This occurred during the winter months when it reached a maximum (in March) of 58 mumol/g fresh weight, a value 10 times greater than that of any of the free amino acids and equal to 50% of the total organic nitrogen in the plant; All of these compounds were depleted to a minimum of about 1 mumol/g fresh weight in October. Both gigartinine and citrullinylarginine were detected in Ahnfeltia plicata, Gracilaria sp. Petrocelis middendorfii, Polyides rotundus, Polysiphonia lanosa, and Rhodomela confervoides.

Amino Acids↗
PubMed1976

Physodes and the phenolic compounds of brown algae. Isolation and characterization of phloroglucinol polymers from Fucus vesiculosus (L.)

A series of vanillin-reactive compounds has been isolated from extracts of the brown alga Fucus vesiculosus. The first three members of this series have been examined by mass spectrometry, nuclear magnetic resonance spectrometry, and chemical methods, and were shown to be phloroglucinol, its phenyl-linked dimer, and a timer also composed of phloroglucinol units. Evidence is presented for the presence of tetrameric, pentameric, and hexameric phloroglucinol derivatives. Polymeric vanillin-reactive compounds were isolated and separated into two fractions. Oxidative hydrolysis of the major one produced phloroglucinol and related oligomers in low yields. The classical vanillin reactivity of physodes may thus be attributed to phloroglucinol-containing derivatives, as originally proposed by Crato (Crato, E.: Ber. Dtsch. Bot, Ges. 10, 295-302 (1892)).

Chromatography, Paper↗
PubMed1967

Bromophenols from red algae.

3,5-Dibromo-p-hydroxybenzyl alcohol is reported as a natural constituent of Odonthalia dentata and Rhodomela confervoides. The amounts isolated, based on the fresh weight of the tissue, were 0.024 and 0.003 percent, respectively. A major phenolic compound in both algae was 2,3-dibromo-4,5-dihydroxybenzyl alcohol.

Bromides↗