The extraction of adhesive and the preparation of gel

related topicsFirst, the experimental purpose
to master the principle of gel extraction, learn the process of freezing preparation.
II, experimental principle
gel is a polymeric sugar compound, is a
plant
natural colloidal substance, widely found in apples, hawthorns and citrus and other fruits and other plants. Phosphorus is found in plants in three forms: raw phosphorus, phosphorus and phosphoric acid.
can be converted to soluble phosphorus when treated with thin acid or in action with phosphase. The basic structure of soluble phosphorus is poly-semi-lactate acid, in which part of the carbide is lipidized into methoxygen. The phosphate methyl content in general plants, accounting for about 7 to 14% of all poly-semi-lactate acid structure can be lipidized, methicillin content is higher than 7% of phosphorus, called high methicillin, that is, ordinary phosphate, methyl oxygen content is less than 7% of phosphorus, almost no gel, but in the presence of polyethic calcium, magnesium, aluminum plasma can produce gel. Polyethic ions play the role
adhesive
crosslinking agent.
adhesive is a white or hazelnut powder. Dissolved in water or viscous liquid, the stone
test paper
is acidic, phosphorus and sugar and
organic
acid cooked together, can form elastic gel, based on this characteristic, gel used in the food industry to make jam, jelly, candy, ice cream, ice cream and so on.
gel can be used as a hemorrhage inhibitor for intestinal bleeding in the pharmaceutical industry. Low methoxytin can form insoluble water-insoluble compounds with metal ions and is a good antidote and preventive agent for metals such as lead, mercury and cobalt.
, instruments and
reagents
instrumentsBeech
(600mL 10mL), measuring barrel (100mL 10mL), electricity Furnace, cloth
flepper
, filter paper, research, acid meter, nylon bag or dragon
head fine cloth bag, surface dish,
drying
device, filter bottle.
reagents
1. 0.1mol/LHCl
2. 95% ethanol
3. citric acid
4, operation step
(i) phosphate extraction
called dried orange peel 15g, washed with water, slightly soft, sheared, placed in a 600mL berries with water 150 to 200mL boiling 10min (removal of sugar, color, bitter taste, etc.) after discarding water. Repeatedly rinse the residue with cold water, squeeze dry after weighing, place in a 600mL beo bowl with 3 times the weight of the residue 0.1MOLHCl boiling 10min, while hot with a tap fine cloth bag
filtering
(cloth bag first soaked with water to squeeze dry), squeeze cloth The bag will squeeze the filter slag dry, discard the filter slag, wash the cloth bag after the filter will be filtered again, concentrate the filter to 50mL cooling filter to add 95% ethanol to the mixture ethanol concentration of 60%, stir well with a glass rod, get the collosion solution. Use the cloth funnel filtration to obtain phosphor precipitation, transfer the phosphorus to the beaker with a small amount of 95% ethanol to wash the filtration (repeat), transfer the adhesive to the filter paper, use the filter paper to absorb dry. After crushing, place the surface dish in the dryer overnight, with the research body grinding to obtain the gel powder calculated rate.
(ii) Jelly production
said to take homemade gel 0.2g in 10mL burning with water 3mL
heating
to dissolve the gel, add sucrose 3g stir well, put a few hours after the gel (gel of the gel, need in acid media, pH is 2.8 to 3.3. The gel is the best, if the phosphate acidity is not enough, can be added citric acid to adjust).