INSOLUBLE CARBOHYDRATES 
the literature of the pectin bodies. 
OR 
MARC, 
81 
Properties. 
: | . Remarks. 
Solvents. | Precipitants. poe | As Renee Other properties. 
é 
Alkaline | Metallic salts; |.......-.-.-.- geet em Ser sane Mucie and oxalic | The product obtain- 
solutions. aleohol;: acid formed on ed by Braconnot is 
sugar. oxidation with probably the pee- 
nitric acid. tic acid of later 
workers. 
(GawWaiter sec) PAU cools | sae ye Si os (eames cra slayvalaall se terte wimialesatojars aoe The product from 
(b) al- () acids. the juice (4) was 
kali so- probably the pec- 
lutions. tin and that from 
the mare (6) the 
pectic acid of later 
workers, 
6 ee Aye RSS aE ee tee ere pee el pean hae ape ee Combustion figures | Peetie acid was 
given for pectin believed to differ 
and pectic acid. from pectin only 
in its higher ash 
content. 
WIGNER ie ee a a Does not yield | Alkali hydrolysis | The existence of a 
sugar; meta- yielded the salt of mother substance 
pectic acid metapectic acid. in the cell walls 
formed. Combustion fig- | of fruits, which 
ures of lead salt | slowly passes into 
given. Boiling pectin as the fruits 
with water in- ripen, issuggested. 
creased the 
amount of lead 
which would 
combine with the 
pectin. 
naar GOR lea Glacetatern asses ee ee eae ee ea ees oe | eNeuLralimreaction: 
basic lead easily powdered. 
acetate; Combustion — fig- 
copper sul- ures given. Ap- t 
phate; lime ple pectin differs 
water; po- from pear pectin 
tassium hy- | in not dissolving 
droxid. in water to form 
a clear solution. | 
Pectins disappear 
as fruits ripen. 
= 2 pst eth se Selb cca SSE Sood ae Oo Se | OOS Aa reese tea ar ante fener aaa ea | Pectin was consid- 
ered to be identical 
| with cellulose. No 
| other authors 
agree with these. 
Walter ses |ATCOhol as = 2 Inactive..| Does not yield | Neutralin reaction, | 
sugar, but not precipitated 
gives meta- by lead acetate. 
pectin and The enzym pec- 
patapectice tase produces pec- 
acid. tosic acid. Solu- 
tions of alkalis 
change pectin to | 
pecticacid. Pyro- | 
pectic acid is pro- | 
duced on heating | 
to 200° C. | 
ool pe Sere DE SIS Se ces REE HSA | Se Bee eres ee Pe Ree as ee ed fc ae ae ah De A discussion only; 
| no data given. 
\\! CICS cet | Fe Sea er eee el DN (Se a ee nee A Rene oni eee ae ate peli ae | 
200°, | | 
BR eau do ....| Alcohol; ba- |............| Arabinose ......| On heating the wa- | 
sic lead ace- | ter solution its | 
tate. | acidity gradually | 
__ increased. | 
2 oS Reag 2 aE ee ee ee ees do ..........| Mucic acid formed | 
| from the beet 
| mare indicating 
| presence of galac- 
| Gehan 
Water ....} Alcohol; lead | From or- |.-..-- Goes eso | INIGIO EVO Bee ea ane Pectin considered to 
acetate. anges in- be a mixture of 
active. arabans and galac- 
tans. 
27981— Bul. 94—05——6 
