PCOG- Part 2 Flashcards
Classification of tannins based on
Goldbeater’s skin test
Classification of tannins based on Goldbeater’s skin test
Positive tannin which is true tannin (tanning test) there are two, hydrolyzavle and nonhydrolyzable or condensed tannin
Negative tannin (tanning test) which is pseudotannin
Tannins can precipitate
Proteins
Alkaloid
Glycoside
Soak a __ in __ ; rinse with __ and
_ in the _ to be _. _
with distilled water and transfer to a _. A _denotes the presence of tannins.
Soak a small piece of goldbeater’s skin in 2%
hydrochloric acid; rinse with distilled water and
place in the solution to be tested for 5 min. Wash
with distilled water and transfer to a 1% solution of
ferrous sulphate. A brown or black colour on the
skin denotes the presence of tannins.
Differentiate Hydrolyzable and non- Hydrolyzable/ condensed tannins
Pyrogallol Catechol
Bluish black with FeCl3 Greenish black with FeCl3
No precipitate in bromine water because it is completely solluble
+Precipitate in bromine water
Leather type: Bloom Leather ( common leather type)
type: +Tanner’s red
Readily hydrolyzed to yield
phenolic acids and sugars
+When they are treated with hydrolytic
agents, they tend to polymerize
yielding PHLOBAPHENES
It is the red insoluble compounds
Phlobaphens
What is the difference between hydrolyzavle tannins and condensed tannins based on OH number
3 OH ni Hydrolyzable
2 OH ni Condensed tannin
General test for condensed tannin
Matchstick test
MATCH STICK TEST:
When a match stick is dipped in _
followed by _ & _ The wood of the
matchstick has lignin.
.
MATCH STICK TEST:
When a match stick is dipped in tannin extract
followed by HCl & warmed near a
flame it turns pink in colour. The wood of the
matchstick has lignin.
Upon hydrolysis of the tannins due to HCl,
phloroglucinol is formed which reacts with the
lignin of the wood to produce the pink colour.
Upon hydrolysis of the tannins due to _ ,
Then what is formed
Tannin
Phroglucinol
Upon hydrolysis of the tannins due to HCl,
phloroglucinol is formed which reacts with the
_ of the wood to produce the _
lignin
pink colour
They are compounds of lower molecular weight than
true tannins and they do not respond to the goldbeater’s
skin test
Pseudotannin
Examples of Pseudotannin
Gallic acid: Rhubarb
Catechins: Guarana, Cocoa
Chlorogenic acid: Mate, Coffee
Ipecacuanhic acid: ipecacuanha
Nasa GC CI pseudo
Pseudotannin
Gallic acid: Rhubarb
Catechins: Guarana, Cocoa
Chlorogenic acid: Mate, Coffee
Ipecacuanhic acid: ipecacuanha
Example of tannins
WITCH HAZEL / HAZEL NUT / SNAPPING NUT
Nutgall
Black catechu
Black catechu
Acacia hundra
Witch hazel/ hazel nut and snapping nut is from the
leaves of Hammamelis virginiana
Nutgall is from the
Quercus infectoria (plants) and Cynips tinctoria (insects)
Sources of Hydrolyzable
Quercus infectoria
Nutgall
What is the source of condensed tannin
Black catechu
consists of fixed oils, fats and waxes
Lipids
Lipids is also known as
Lipins or lipoids
Differentiate fixed oils, fats and waxes
FO- Long chain unsaturated FA + glycerol
FATS
Long chain saturated FA+ glycerol
WAXES
Long chain FAb+ HMW such as cetyl alcohol and stearyl alcohol
Liquid at room temperature
Fixed oils
Solid at room temperature
Fats
Waxes
two carboxylic acid groups
Dicarboxylic acids
Oh My Such Good Apple Pie Sweet As Suga
2 Oxalic
7 Pimelic
3 Malonic
8 Suberic
4 Succinic
9 Azelaic
5 Glutaric
10 Sebacic
6 Adipic
USP test for lipids
Acid value
Ester Value
Saponification value/ Koettsdofer Value
Iodine value
Mg of KOH needed to neutralize free FA in 1 gram
Acid value
Mg of KOH needed to saponify esters in 1 gram
Ester value
It is the amount of Acid value - Ester value
Koettsdorfer value or saponification value
Gram of iodine absorbed by 100g of sampel
Iodine value
Example of Non drying and it’s iodine value range
Lesser than 100
Olive, almond
Example of semi drying and it’s iodine value range
100-120
Cottonseed, sesame
Example of drying and it’s iodine value range
Greater than 120
Linseed
Cod liver oil
Biological sources of Oil
CPP
COP
RS
CS
ACL
Coconut oil
Palm oil
Palm kernel oil
Castor oil
Olive oil
Peanut oil
Rapeseed oil
Soya oil
Cottonseed oil
Sesame oil
Almond oil
Corn oil
Linseed oil
Coconut oil part
From
Family
seed kernels of the coconut palm,
Cocos nucifera Linne’
(Fam. Arecaceae)
Palm oil
part
From
Family
freshly part (mesocarp) of the fruit
Elaeis guineess
(Fam Arecaceae)
Obtained as a minor product during processing of
oil palm fruit.
PALM KERNEL OIL
It is obtained from palm kernels after separation,
drying and cracking of the shell of the nut.
Palm kernel oil
Palm kernel is obtained through from palm kernels after __of the nut.
separation,
drying and cracking of the shell
Castor oil
Parts
SN
Family
ripe seed of
Ricinus
communis Linne’
(Fam. Euphorbiaceae)
Uses of castor oil
stimulant cathartic at 15- 60 ml
emollient effect
plasticizer
in flexible collodion
is an ingredient in a vaginal jelly for
restoration and maintenance for vaginal acidity.
Ricinoleic acid is an ingredient in a vaginal jelly for
restoration and maintenance for vaginal acidity.
Olive oil part
Sn
Family
Fixed oil obtained from the ripe fruit of
Olea europea
Linne
Fam. Oleaceae)
It is sometimes called SWEET OIL
Olive oil
Preparation for olive oil
( cold pressed) Virgin oil
Extracted with less pressure
First Grade virgin olive oil
Pulp in #1 is extracted with
more pressure
Second grade virgin olive oil
Extracted with hot water
Techincal Oil
Extracted with S2
Sulfur Grade
Fallen and decomposing
Tournant Oil
Peanut oil
Part
Sn
Family
Ripe fruit or seed of
Arachis hypogaea Linne’
(Fam.
Fabaceae)
Peanut oil fruit is a true nut? T or F
False
The fruit is not a true nut because the immature pod
penetrates the soil and ripens underground
is the fixed oil obtained from the seeds of Brassica
campestris,
Rapeseed oil
Rapeseed oil
Part
SN
seeds
Brassica
campestris,
The oil consists of mixture of triacylglycerols that
are rich in unsaturated fatty acid
Rapeseed oil
It consist canla oil
Rapeseed oil
Soybean oil part
SN
Fam
ripe seed
Glycine soja
Fam. Fabaceae)
The seeds contain about 35% of carbohydrates, up to 50% of protein
substance, up to 20% of the fixed oil, and the enzyme, UREASE
Soybean oil
Soybean oil contains
35% of carbohydrates,
up to 50% of protein
substance,
up to 20% of the fixed oil,
UREASE
WULZEN ANTI-STIFFNESS FACTOR
STIGMASTEROL
Use of tannin, Industrially
Industrially: in leather tanning, ink manufacture
Use of tannin medically and in labs
Medicinally: astringent, hemostatic, antidiarrheal,
antidote in alkaloid and heavy metals toxicity.
In labs: reagent for detection of proteins, alkaloids
and heavy metals because of their precipitating
properties.
Cottonseed
Part
SN
family
seed of
Gossypium
hirsutum or of other species of Gossypium
(Fam.
Malvaceae).
Refined fixed oil, obtained from the
seed of
cultivated plants of various varieties of Gossypium
hirsutum or of other species of Gossypium (Fam.
Malvaceae).
Cottonseed oil