fischer yg ini

8/10/2019 Fischer Yg Ini

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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

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