Proteines Flashcards

1
Q

En quoi consiste la méthode de biuret et lowry?

A

( biuret+ folin)
Ajout de ions Cu2+ lié à azote
Absorbant dans 540nm-550

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2
Q

Absorbance liaison peptidique

A

210nm

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3
Q

AA aromatique

Absorbance à 1mg de prot ?

A

A280 entre 0,5 et 2,0

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4
Q

Biuret sensibilité ?

A

Peu sensible

1 à 20 mg/l

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5
Q

BCA

A

Moins d’interférences avec le saccharose, TRIS, glycérol

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6
Q

Lowry et BCA sensibilité ?

A

x100 plus sensible ( 5à 10 microgramme/l)

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7
Q

Pk+ ou - unite de pH

A

90% et 10%

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8
Q

Pk 2 + unité de PH

A

99% et 1%

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9
Q

Pk+ ou - de PH

A

99,9% et 0,1

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10
Q

AA neutre Phi?

A

Phi=6

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11
Q

AA acide phi?

Et exception ? Quand pka

A

Phi=3

Et D et E

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12
Q

PHi pour AA basique ?
Et exception ?
- pkapkr

A

-pkapkr H. Phi=8

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13
Q

Lyophilisation

A

Sublimation de l’eau
PAS de purification
CONCENTRATION

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14
Q

Ultrafiltration

A

Filtration sous pression d’air à travers une mb, pores X de sels et tampon retenant macromolécules

PAS de purification
CONCENTRATION

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15
Q

Chromatographie

A

Séparation selon critères bioch

CONCENTRATION SELON TYPE ELUTION
PURIFICATION

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16
Q

Dialyse

A

Mb 1/2 permeable avec séparation selon taille des pores
Comme les reins

PAS de concentration
PURIFICATION

17
Q

Ocytocine

A

Hormone contracturante fibres musculaires lisses utérus et alvéoles mammaires

18
Q

Vasopressine

A

H antidiurétique