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Fischer ProjectionL SystemHaworStructure
1STGROUP
SALMI SEPRIANTI IRWAN ABDILLAH ADAM
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Fischer Projection
Molecule in nature is actually three-dimensional shape, but for ease of study,
molecules described in terms of two dimensions.
The structure is a two-dimensional projection of a three-dimensional shape is calle
Projection
Discovered by a scientist named Emil Fischer (1852-1919) a German organic chnation that received the Nobel Prize for chemistry in 1902 for his work on the ch
(stereochemistry) and structural formula of carbohydrates, using the projection for
the structural formula carbohydrate.
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Fischer Projection
Fischer projection is widely used in space systems carbohydrate molecules.
Basically, when we write the open-chain unsaturated organic compounds, indirectly w
Fischer projection space.
In this case, the position of the molecule is not enforced, but resting. In the projectio
usually a large group or substituent is placed in the position of the ends of the molecule
top and on the bottom). Bond line upright (vertical), especially those located at the ends
position is away from the observer, while the bond line is horizontal or horizontally, its p
to the observer. Thus, the projection space is actually the same as the Fischer projecti
line is positioned upright (vertical).
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Fischer ProjectionIn the Fischer projection of a carbohydrate, the carbon chain is described in a verwith the aldehyde or keto clusters are at the peak of the formula.
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D, L System
In a Fisher projection of the sugar, the determination of D or L based on the asym
carbon atom molecule penultimate, which is a C-5 at a aldohexoses.
As in the formula for D-glyceraldehyde, written hydroxyl cluster to the right of th
the shape of D from glucose.
Enantiomers (mirror shadows isomers) of D-glucose are L-glucose, which has
configuration at each of the four asymmetric centers.
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D, L System
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Haworth Structure
Sir Walter Norman Haworth (1883-1950) an English chemist found, the glucose m
the first five carbon atoms with oxygen atoms to form hexagonal rings. Therefore
the formula is written as a form of carbohydrate structures furan ring and piran ring.
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Haworth Structure
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Haworth Structure
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The form of and Sugar
Because the glucose ring of six similar to piran, then called the pyranoseof
anomers and -D-glucopyranose. While, The glucose ring of five similar to
furanosaof glucose.
In the structure of Haworth, form of sugar has a hydroxyl group that is
anomeric carbon and forms of sugar has a hydroxyl group that is written ab
carbon
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The form of and Sugar
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ReferencesLehninger, A.L. 1998. Dasar-Dasar Biokimia. Terjemahan, M. Thenawidjaja. Jakart
Sinar Harapan.
Pratama, Oktaviani. 2013. Struktur Karbohidrat. (http://oktavianipratama.woaccessed at 17thOct 2014
Tahirah, Rahmawati. 2012. KARBOHIDRAT. (http://rtahirah.blogspot.com/ )access2014
Zarmanaya. 2013. Struktur dan Fungsi Makromolekul Karbohidrat, Protein, LipiNukleat di dalam Sel (croisant.wordpress.com) accessed at 17thOct 2014