Guar gum cas no.9000-30-0 basic information

Guar gum, also known as guar gum, is an extract of the leguminous guar bean and is a galactomannan commonly used as a food thickener.

Chinese name

Guar gum

Foreign names

guar gum

The molecular weight

About 220,000 daltons

The CAS login no.

9000-30-0

EINECS no. Login

232-536-8

Outside view

A free-flowing off-white powder

Should be used

Thickening agent for food

Introduction to the

Guar gum, known in English as guar gum, is a highly purified natural polysaccharide derived from guar bean, a legume plant widely grown in the Indo-Pakistan subcontinent. Due to its unique molecular structure characteristics and natural nature, it has quickly become a new environment-friendly paper auxiliaries with superior performance. It is also widely used in food, oil, medicine and other fields. [1]

Hydroxypropyl guar gum

Guar gum is a macromolecular natural hydrophilic colloid, belonging to natural galactomannan, one of the quality amendments, a natural thickening agent. The APPEARANCE IS from white to YELLOWISH free flowing powder, soluble in cold or hot water, after water and form a gelATinous substance, to achieve the effect of rapid thickening. Mainly divided into food grade and industrial grade (oil field use belongs to the industrial grade) two. General export packing is 25KG/ bag, outer kraft paper, inner PE film bag. It is widely used for thickening purposes such as oil fracturing and drilling, as well as food additives, printing and dyeing, and architectural coatings. Guar gum is the most potent and water-soluble natural polymer known. At low concentration, high viscous solution can be formed; It exhibits non-Newtonian rheological properties and forms acid reversible gel with borax. Due to its unique properties, it is used in food, pharmaceutical, cosmetics, personal health care, petroleum, mosquito repellent, paper making and textile printing and dyeing industries.

Identification test

1. Solubility: Take 1g of the sample and add 100mL water into a dry grinding conical flask, and immediately plug it and shake it violently. Guar gum is dissolved in cold water and thickened rapidly.

2. Cross-linking reaction: Take the sample solution of Guar gum in a 100mL beaker, add 10mL of 1% borax solution and stir immediately to form a hanging jelly.

3. Microscopic identification: Weigh 0.2g of the sample in a mortar, add 2 ~ 3mL of aqueous solution containing 0.5% iodine and 1% potassium iodide, put it on the slide after grinding, and observe it under the microscope. Guar gum shows tightly clustered round to pear-shaped cells with yellow to brown intracellular contents.

4. Determination of viscosity

Instruments:

Ndj-1 rotary viscometer;

Electric thermostatic water bath;

Analytical balance, sensitivity 0.1mg;

250mL tall beaker;

300mL conical flask with stoppered mouth.

Measurement procedure:

After drying in 105℃ oven for 2h, 2.500g of the sample was accurately weighed and placed in a dry conical flask, and 200.0ml water was added. The sample was immediately stopped and shaken vigorously until the solution was uniform, and then 47.5mL water was added and shaken. After 10min, the solution was shaken once, and then shaken repeatedly every 0.5h Medium swelling for 0.5h, stir evenly with glass rod, and then use NDJ-1 rotary viscometer to measure the apparent viscosity of glue solution at 25℃ at 12R /min with No. 3 rotor.

To calculate

η1=X×K(the result is kept as an integer)………………… (1)

Where: η1———— sample dynamic viscosity,mPa·s;

X -- viscometer reading;

K -- rotor constant, take No. 3 rotor when K=100, take No. 4 rotor when K=500(when the test liquid viscosity is too high beyond the use of No. 3 rotor viscometer measurement range, can use No. 4 rotor).

5, borate identification

5.1 Reagents: hydrochloric acid solution: 10% hydrochloric acid aqueous solution; Ammonia reagent: 28% ammonia 400mL plus water to 1000mL.

5.2 Identification Method:

Take 1g sample and stir to dissolve in 100mL water, the solution must keep the flow dynamic, do not form jelly. Add 10mL hydrochloric acid solution, stir, if the following phenomenon occurs, it is deemed to contain borate: drop a drop of sample mixture on the turmeric test paper appears maroon-red, the color will deepen after drying, when the ammonia reagent is soaked into green black

Protein identification: The sample under 2g(accurate to 0.1mg) was weighed according to GB/T 14771, and the coefficient of nitrogen conversion to protein was 6.25.

6. Identification of starch

6.1 Reagents:

Iodine reagent: Weigh 14g iodine and dissolve it in 100mL aqueous solution containing 36g potassium iodide, add three drops of hydrochloric acid and dilute it with water to 1000mL.

6.2 Identification method

1g of the sample was weighed, placed in a 250mL beaker with 100mL water, and dissolved by stirring. Add iodine reagent, no blue color.

Technical indicators

Technical indicators

Project Name Index

HV high viscosity type MV medium viscosity type

Viscosity of 1% aqueous solution ≥ 6000MPA. s ≥ 5000MPA. s

Drying reduction ≤12.0% ≤12.0%

Ash content of 1.0% or less 1.5% or less

Acid insoluble matter ≤7% ≤7%

Borate can not be detected

Protein ≤10% ≤10%

Starch test shall not be detected shall not be detected

Arsenic 3 PPM or less 3 PPM or less

Lead 10 PPM or less 10 PPM or less

performance

Solubility in cold and hot water has superior dispersion ability, will not produce agglomeration phenomenon, improve the manufacturing and production operation convenience. High salt and PH compatibility is rapidly expanded and dissolved over a wide range of PH values, and remains stable even in systems with high salt content. Chemical STRUCTURE DUE TO THE uniform distribution OF NITROGEN content, MORE affinity than similar products, can show excellent antistatic and conditioning effect after adsorption on the hair, improve the wet combing of hair, make hair maintain gloss, soft, elastic for a long time. The softness is extremely gentle to the skin and eyes, and can reduce the irritation of the surfactant in the formulated products. Compatibility with anions, zwitterions and surfactants have good compatibility, can be used in all kinds of surfactant products. Increase particle deposition when used in the formulation with polymer silicone oil and chip removal agents carry and synergistic effects, and improve the fullness and stability of the foam.

use

Hair care

Used as hair and skin conditioner, antistatic agent and thickening agent, suitable for shampoo, conditioner. [3]

Papermaking assistant

The research SHOWS THAT GUAR gum can meet the requirements of zero discharge in modern factories, and can maintain or improve the uniformity of paper pages while improving the retention and water filtration, which is a promising environmental auxiliaries. [3]

Stability and storage conditions

The aqueous dispersion of guar gum is buffered and stable between PH4.0 and 10.5. Continuous heating will reduce the viscosity of the dispersion.

Store guar gum powder in an airtight container in a cool, dry place.

The molecular structure

Guar gum is a kind of non-ionic polysaccharide with polymannose as the main chain and β-(1-4) glycoside bond between D-pyranomanose units. However, D-pyran galactose is connected to polymannose backbone by α (1-6) bond. The molar ratio of mannose to galactose unit in guar gum is 2∶1, that is, every other mannose unit is connected with a galactose branch. It has been reported that the molecular weight of guar gum is around 220000. The biggest characteristic or advantage of guar gum molecule is that it is very similar to cellulose structure, and this similarity makes it have strong affinity to cellulose, which is called substantivity. [3]

Using the advantages

· Performance in the 2 in 1 shampoo formula using a 2 in 1 shampoo system with the exact same formula, containing cationic conditioner, silicone oil and the same surfactant. The shampoo contains cationic guar gum and the similar conditioners A, B and C commonly used at home and abroad as comparison. The results show that the performance of the system containing cationic guar gum is similar to other products. The differences are as follows: cationic guar gum is better than A polymer shampoo in wet combing and wet hair feeling; In terms of dry combing, it is superior to B polymer shampoo. It is superior to C polymer shampoo in wet combing and foam volume.

· Cationic guar gum has less accumulation and better affinity. The hair conditioning effect of the polymer occurs when the hair is rinsed. After being used, the hair is shiny and has a natural feeling. Compared with regular shampoos without conditioner, shampoos with conditioner tend to reduce the volume of dry hair (the hair is close to the scalp and not fluffy). In principle, the more resistance to combing the dry hair with conditioner is reduced, the worse the volume of hair is, indicating that the polymer has accumulated behavior. It is known by experiment; Cationic guar gum through 10 repeated washes, still maintain the fullness of the hair, rather than more and more heavy, close to the scalp. This indicated that the polymer had less accumulation. It eliminates the negative effects of accumulation, heavy, sticky and hair wilting after long-term use.

· Increase hair shine and health Using a shampoo system of cationic Guar gum polymer can increase the retention of the active ingredients silicone oil and ZPT on the hair, leaving the hair shiny and healthy, easy to comb, bright and static free.

· Improve the stability of the formula Because cationic Guar gum has the function of suspension and emulsification, when the content of silicone oil in the formula is high, it can play the role of suspension and carrying, helping to stabilize the silicone oil in the shampoo formula.

security

· Cationic guar gum has been proved to be non-toxic by animal tests, especially safer in the cosmetics concentration and mass fraction range of 0.5 ~ 0.8%.