Hendrik Belitz

Learn More
Two Cheddar cheeses from two different production plants were ripened over 24 weeks at 10 degrees C and then analysed for peptides soluble in citrate buffer at pH 4.6 by reversed-phase (RP)-HPLC. Thirteen peptides with a chain length of between 35 and 65 amino acid residues and molecular masses between 3800 and 7400 were isolated and assigned to the(More)
Ten potato varieties, with different rates of browning, were analyzed quantitatively for phenoloxidase, tyrosine, chlorogenic acid, caffeic acid, and for reducing substances (ascorbic acid). The rate of tyrosine turnover was calculated from the data. The fact that the further reactions of the primary oxidation products leading to browning only take place(More)
beta-Casein A2 was isolated from milk of a homozygous cow and hydrolysed with trypsin. The hydrolysate was separated by RP-HPLC into 18 peptides, all but one of which could be attributed to the sequence of beta-casein on the basis of the amino acid composition. Some peptides overlapped. In total, they represented about 97% of the protein sequence. Only(More)
To determine the toxic effect of different gliadins on coeliac patients, which has been variably assessed in the literature, wheat prolamines (gliadin) were separated into the main fractions alpha-, beta-, gamma-, and omega-gliadins by chromatography on Sulfopropyl Sephadex C-50. The chemical compositions of the gliands were characterized by polyacrylamide(More)
For the isolation of coeliac active peptide fractions the peptic tryptic digest of whole gliadin was successively separated by ultrafiltration, gel filtration, cation-exchange chromatography, anion exchange chromatography and high-performance liquid chromatography. After each separation step the peptide fractions obtained were characterized by amino acid(More)
Reduced glutenin is separated by gel permeation high-performance liquid chromatography into three major and five minor fractions, which significantly differ in their amino acid compositions. By reversed-phase high performance liquid chromatography, about 20 glutenin components are obtained. These can be classified into three groups according to their amino(More)
The coeliac active peptide B 3142, which has been isolated from a peptic-tryptic digest of gliadin and which consists of 53 amino-acid sequences, was partially hydrolyzed with alpha-chymotrypsin. The two fragment peptides CT-1 (positions 1-22 of B 3142) and CT-2 (positions 23-53) were separated by high-performance liquid chromatography on octadecyl silica(More)
We propose an automated model-based approach for segmenting subcortical structures, especially the basal ganglia, from 3D human brain MRI images. Our hybrid approach combines an automatic tissue classification scheme, a landmark detection algorithm and a discrete active surface model (ASM) to achieve its goal. A priori knowledge is incorporated into the(More)
Six proteinase inhibitors have been isolated from a crude inhibitor preparation from Phaseolus vulgaris var. nanus (bush bean: Borlotto) by gel chromatography and ion exchange chromatography. The isoelectric points of the inhibitors are between 4.35 and 5.65. The molecular weights of the inhibitors PVI-2, -3(1), -3(2), and -4 and between 8000 and 9500. The(More)