DOI Heft:
Sudan
DOI Artikel:Zadrożna, Irmina: Analyses of binders in the painting layer from the cruciform building (B.III) in Dongola
DOI Seite / Zitierlink: https://doi.org/10.11588/diglit.41371#0217
OLD DONGOLA
SUDAN
palmitic (P) and stearic (S) in a ratio typical
of nut oil (P / S) = 3-
An infrared spectrum for this sample
identified amide bands at 3400, 1624,
1532 cm"1 (a strong carbonate-related band
partly superimposed on it) indicating the
presence of a protein binder, and a band at
1736 cm-1 characteristic of the oil ester group.
Binder composition: egg yolk and nut oil.
Sample no. 10 (first layer of plaster)
Infrared spectrum for the sample
yielded identical results as in the case of
sample no. 9, indicating the same make-up
of the binder.
Sample no. 11 (first layer of plaster)
Sample was subjected to acidolysis. The
chromatogram contains insignificant
amounts of amino acids: glycine, alanine,
proline, glutamic acid and aspartic acid,
characteristic of a protein binder — egg
yolk. Insignificant amounts of mono- and
dicarboxyl acids also occur, including
palmitic (P) and stearic (S) in a ratio typical
of nut oil (P / S) = 3-
An infrared spectrum for this sample
identified amide bands at 3396 cm'1,
1624 cm'1 and 1560 cm'1 indicating the
presence of a protein binder.
Binder composition: egg yolk with an
insignificant amount of nut oil.
Sample no. 12 (second layer of plaster)
The chromatogram made for the
product of acid hydrolysis revealed the
presence of amino acids: alanine, proline,
aspartic acid, glutamic acid and others
testifying to the use of a protein binder.
Comparison with a model spectrum for egg
yolk suggests its presence. Also observed
are mono- and dicarboxyl acids, including
palmitic (P) (retention time 33-63 min)
and stearic (S) (retention time 37.07 min)
in a ratio typical of nut oil (P / S = 3).
The infrared spectrum for this sample
revealed bands representing amide
bonding at 3408 cm"1 and at 1624 cm"1
and 1576 cm'1 (strong carbonate-related
band partly superimposed on the last).
Also present are bands at 1736 cm"1,
characteristic of the oil ester group, and
a band at 2516 cm"1, originating from the
clay in the plaster.
Binder composition: egg yolk, nut oil (in
considerable excess).
215
SUDAN
palmitic (P) and stearic (S) in a ratio typical
of nut oil (P / S) = 3-
An infrared spectrum for this sample
identified amide bands at 3400, 1624,
1532 cm"1 (a strong carbonate-related band
partly superimposed on it) indicating the
presence of a protein binder, and a band at
1736 cm-1 characteristic of the oil ester group.
Binder composition: egg yolk and nut oil.
Sample no. 10 (first layer of plaster)
Infrared spectrum for the sample
yielded identical results as in the case of
sample no. 9, indicating the same make-up
of the binder.
Sample no. 11 (first layer of plaster)
Sample was subjected to acidolysis. The
chromatogram contains insignificant
amounts of amino acids: glycine, alanine,
proline, glutamic acid and aspartic acid,
characteristic of a protein binder — egg
yolk. Insignificant amounts of mono- and
dicarboxyl acids also occur, including
palmitic (P) and stearic (S) in a ratio typical
of nut oil (P / S) = 3-
An infrared spectrum for this sample
identified amide bands at 3396 cm'1,
1624 cm'1 and 1560 cm'1 indicating the
presence of a protein binder.
Binder composition: egg yolk with an
insignificant amount of nut oil.
Sample no. 12 (second layer of plaster)
The chromatogram made for the
product of acid hydrolysis revealed the
presence of amino acids: alanine, proline,
aspartic acid, glutamic acid and others
testifying to the use of a protein binder.
Comparison with a model spectrum for egg
yolk suggests its presence. Also observed
are mono- and dicarboxyl acids, including
palmitic (P) (retention time 33-63 min)
and stearic (S) (retention time 37.07 min)
in a ratio typical of nut oil (P / S = 3).
The infrared spectrum for this sample
revealed bands representing amide
bonding at 3408 cm"1 and at 1624 cm"1
and 1576 cm'1 (strong carbonate-related
band partly superimposed on the last).
Also present are bands at 1736 cm"1,
characteristic of the oil ester group, and
a band at 2516 cm"1, originating from the
clay in the plaster.
Binder composition: egg yolk, nut oil (in
considerable excess).
215