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Type of publication: Diploma Thesis
Type of document:

Year: 2011

Authors: Hausegger, Bettina

Title: Phytochemische Untersuchung und Nährstoffzusammensetzung von Kaffeeröstabfällen.

Other title: Phytochemically examination and nutrient composition of coffee roasting waste

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 39.


Franz Chlodwig
Hahn-Ramssl Isabella

Zitterl-Eglseer Karin

Vetmed Research Units:
Institute of Animal Nutrition and Functional Plant Compounds

Graduation date: 22.12.11

To determine whether the resulting from coffee roasting waste of silver skin and coverings of the endosperm as a food additive or dietary products may find use, samples of four different Austrian roasters (Company Eduscho/Tchibo, Company Segafredo, Company Meinl and Kaffeerösterei Alt Wien) were examined phytochemically, on their antioxidant activity and analysed on their nutrient composition. In all four samples the methylxanthine caffeine that has adaptogenic effect as adenosine antagonist and as phosphodiesterase inhibitor on different body cells, comparable to the features of beta-agonists, could be determined as an ingredient. Swelling index was found from 5.5 to 24.5 ml/g indicating a high fiber content and was comparable with those of Psyllii semen (10 ml/g) or Plantaginis ovatae semen (9 ml/g). Using Folin-Ciocalteau reagent the total phenol contents in caffeic acid-equivalents reached amounts from 10.3 mg/g in the sample of Company Segafredo to 18.8 mg/g in the sample of Eduscho/Tchibo. Acidification achieved an increase of caffeic acid-equivalents of 1.2 % in the sample of Eduscho/Tchibo, of 1.4 % in the sample of Segafredo, and of 1.3 % in the sample of Alt Wien and the sample of Meinl. In contrast, the antioxidant activity determined by DPPH-method could be increased by acidification of the extracts of the four samples from 8.9 mg/g (Segafredo), 12.2 mg/g (Alt Wien), 16.5 mg/g (Meinl) and 24.1 mg/g (Eduscho/Tchibo) about to 4.9 % (Segafredo) calculated in Trolox-equivalents. No increase of antioxidant activity could be recognized by pH-lowering in the Fe3+-reduction-method. The fiber content value found in the Weender analysis of the sample of Kaffeerösterei Alt Wien was 1.3 to 1.6 % higher compared to the other three samples. Although the sample of the Company Meinl showed 1.7 to 2.4 % higher fat values, however, the sample of the Company Eduscho/Tchibo presented the highest value of 19.058 J/g in Calorimetry. Concerning the volume elements high differences in the potassium values were found from 30 g/kg in original substance (os) in the sample of the Company Eduscho/Tchibo to 14 g/kg in os in the sample of Kaffeerösterrei Alt Wien. In the testing of the trace-elements the iron values detected in these two samples with 2.3 and 2.7 g/kg in os used to be between 4.1 to 5 % higher than in the sample of the Company Meinl and even 5.2 to 6.4 % higher than in the coffee roast material of the Company Segafredo. As a supplement for animal feed, for example in obese animals, this free coffee roasting waste could be used well through the interplay of the various substances contained.

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