Chlorogenic and quinic acids in sunflower meal

Abstract

Chlorogenic and quinic acids were isolated from the kernel of sunflower seed by column chromatography and identified by paper chromatography. Ultra-violet and infra-red spectra of the above acids were compared with those of pure preparations. The contents of both acids in the kernel and hull of sunflower seeds were determined and the conversion of chlorogenic acid into quinic acid at temperatures of 100" and 135" was followed. During storage of sunflower meal re-synthesis of chlorogenic acid was observed. Effects of isolates of chlorogenic and quinic acids on a-amylase, trypsin and lipase activity were detected.

Chemical composition, digestibility and protein quality of 12 sunflower (Helianthus annuus L) cultivars

“…36,37 Its presence in the plant has been reported to affect protein digestibility by inhibiting the activity of proteolytic enzymes. 12 Interactions between chlorogenic acid and sun¯ower proteins have also been observed in certain conditions, which may lower the nutritive value of sun¯ower protein, since the condensation products formed are resistant to proteolytic enzymes. 38 Polyphenoloxidase catalyses the oxidation of polyphenols to o-quinones.…”

“…8,35 Since the determination of phenolic acids was carried out on the defatted seeds, changes in their concentrations during fat extraction or storage of the seeds may have occurred. 12 Chlorogenic acid is the major phenolic compound Means in the same column with different superscript letters are signi®cantly different (P 0.05). in sun¯ower seeds.…”

Effect of Chlorogenic Acid in a Casein Diet for Rats

“…Other experiments (8,9) have demon strated a centrally stimulating effect of chlorogenic acid in mice and a stimula tion of gastric secretion, gastrointestinal peristalsis and bile secretion in rats. In vitro, chlorogenic acid has turned out to be a potent inhibitor of many enzyme activities including some glycolytic enzymes (10) as well as trypsin and lipase (11). It also exerts powerful anti thiamine activity (12).…”

Relationship of Chlorogenic Acid Concentration in Sunflower Achenes to Bird Predation of Sunflower

“…Each sample was dried for 2 h at'/5"C. Hulls were ground with a Wylie miil to pass a 2O-mesh screen; seeds were finely ground with a mortar and pestle. Samples (50 mg) were placed in 70% methanol solution and shaken for 2 h. After filtration, the absorbance of each sample was measured at 328 nm (Milic et al 1968 …”