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Relationship between dietary fiber levels and protein digestibility in selected foods as determined in rats (1989)

Mongeau, Roger ; Sarwar, Ghulam ; Peace, Robert W. ; [et al.]

Springer

Plant foods for human nutrition 39 (1989), S. 45-51

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ISSN: 1573-9104

Keywords: dietary fiber ; cellulose ; protein digestibility ; fermentation

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Samples of 15 food products and feces obtained by feeding them to rats were analysed for dietary fiber fractions. The food products were added as the sole source of protein in 8% protein diets, making up 8.8–51.6% of the diets. Diets were supplemented with 0.54–5.00% purified cellulose to make them more comparable in total fiber. Fiber analyses of food products revealed that the protein sources provided 0.06–7.27% total dietary fiber. The true protein digestibility in rats was negatively correlated with the total food fiber level (r=−0.69,P〈0.01) or with the food cellulose level (r=−0.82,P〈0.01) but it was positively correlated (r=+0.81,P〈0.01) with the purified cellulose level. No relationship was found between protein digestibility and fiber fermentability. Results indicate that several food fiber fractions and possibly associated substances influenced protein digestibility. Purified cellulose did not have the same physiological behavior as food cellulose from the viewpoint of protein digestibility and fiber fermentability.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01092400

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Some highly fluorinated acyclic, cyclic, and polycyclic derivatives of Cl2NCF2CF2NCl2 and Cl2C=NCCl2CCl2N=CCl2 (1990)

Sarwar, Ghulam ; Kirchmeier, Robert L. ; Shreeve, Jean'ne M.

New York, NY [u.a.] : Wiley-Blackwell

Heteroatom Chemistry 1 (1990), S. 167-173

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ISSN: 1042-7163

Keywords: Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: When Cl2NCF2CF2NCl2 is heated with CF2=CFX (X = Cl, F) ClXCFCF2N(Cl)CF2CF2N(Cl)CF2CXClF (X = Cl, 2; F, 3) is formed. Mercury extracts chlorine fluoride from 2 and 3 to form new polyfluorobisazomethines, ClXCFCF2N=CFCF=NCF2CXClF (X = Cl, 4; F, 5). Photolysis of the product obtained from CCl2=NCCl2CCl2N=CCl2 with ClF, CF2ClN(Cl)CF ClCFClN(Cl)CF2Cl (6) gives another bisazomethine, CF2ClN=CFCF=NCF2Cl (7) with concomitant loss of Cl2. At 25°C, in the presence of CsF, 4 and 5 are cyclized to give (X = Cl, 8; F, 9), and 7 forms a bicyclic derivative at 100°C, (1). Addition of chlorine fluoride to 8 and to 1 produces (10) and (14), respectively. Photolysis of 10 results in the loss of CFCl3 to form (11), and 14 loses Cl2 and dimerizes to the hydrazine (15). The further addition of ClF to 11 gives rise to (12) which when photolyzed at 3000 Å forms a second cyclic hydrazine, (13).