LM pectin manufacturer
LM pectin for low Acidic food products
In daily life, we will generally use pectin to make some desserts, such as jam, candy, jelly, etc. Pectin is divided into HMpectin and LMpectin. The following is LM pectin manufacturer.
Specification of LM pectin manufacturer
|Product parameters||Test standards||Test results|
|Appearance: light yellow powder|
|White powder qualified|
|Particle size||≥95%||Pass 60 meshes Qualified|
|Gel degree (USA-SAG, °)||150±5°||151°|
|Galacturonic acid%||≥ 65.0||91.5|
|Ash content%||≤ 5||2.5|
|Hydrochloric acid insoluble matter%||≤ 1||0.16|
|PH (2.5% water solubility)||2.6-3.0||2.8|
|Heavy metal (Pb) mg/kg||≤ 15||<15|
|Arsenic mg/kg||≤ 2||<2|
|Lead mg/kg||≤ 5||<5|
|Sulfur dioxide%||≤ 0.005||<0.005|
The function and application of LM pectin in food industry
The function of LM pectin manufacturer
Pectin has always been a natural part of human diet. It is a safe and non-toxic natural food additive recommended by the FAO/WHO Joint Committee on Food Additives. There is no daily limit on the amount of pectin added. Pectin has many functions. For example, pectin, as a natural vegetable colloid, can be widely used in the food industry as a gelling agent, stabilizer, tissue forming agent, emulsifier and thickener. Pectin is also a water-soluble dietary fiber, which has the function of enhancing gastrointestinal peristalsis and promoting nutrient absorption.
It has a good effect on the prevention and treatment of diarrhea, colon cancer, diabetes, obesity and other diseases, and is an excellent matrix for drug preparation. At the same time, pectin is a good heavy metal adsorbent, because the molecular chain of pectin can form an “egg box” like network structure with high price metal ions, so that pectin has a good adsorption function of heavy metals. In addition, pectin has film forming properties, good water retention and radiation resistance.
The application of LM pectin manufacturer
Pectin is used in the food industry as a food additive or ingredient, and it mainly plays a role in gelling, thickening, improving texture, emulsifying and stabilizing. The solid content needs to be less than 60% of the product, and the product needs to contain calcium ions or other metal ions, so that the gel will eventually form. The use condition of low-ester pectin is that the pH of the system is 2.6～6.8, the solid content is higher than 10%, and calcium ions are required (at least 15mg/g pectin). It is mainly used for low-sugar jam, yogurt pulp base, soft candy , Sweets, bakery products, glazing, etc.
(1) Yogurt products
In the production process of yogurt, different kinds of pectin have different functions. For example, adding low methoxy pectin can prevent whey release. In the process of making yogurt, it is necessary to strictly control the dosage of pectin. Once sufficient amount of additives are not added, the charge will be neutralized and the repulsion force will disappear. The structure of dairy products can not be stable, so the structure of acidic dairy products can only be kept stable after the addition of new repulsion force.
If there is too little pectin in the raw material when making jam, you can take advantage of the thickening effect of pectin and use 0.20% pectin as thickener. The usage of pectin in low-sugar jam is about 0.60%. The recipe of low-sugar strawberry jam is 50.00% strawberries, 36.00% sugar, 13.00% water, 0.60% amidated low methoxy pectin and 0.40% citric acid. In the strawberry jam recipe above, amideated low-methoxy-pectin or methoxy-pectin can be used, since there is a certain amount of calcium in the fruit and water, so calcium salts are not needed.
Because the dough with pectin is more malleable, the baking volume of the bread increases. For example, in hamburger making, if the size of the hamburger is kept the same, adding pectin reduces the amount of flour used to make the same size hamburger by 30 percent. In addition, bread made with pectin added dough can prolong the selling time of bread.
As people pay more attention to healthy diet, low-sugar drinks have become more and more popular in the market. However, the taste of drinks decreases with the decrease of sweetness. In this regard, low methoxyl pectin can be added to enhance the taste of the drink. Add it to contain the fruit drinks, it can be generated and calcium gel reaction, thus reducing due to pulp precipitation hard material, make pulp evenly suspended in the beverage, also can improve the taste of fruit juice, not only overcome the difference of pseudoplastic of sodium alginate, shortcomings and so on rubber smell, turbidity, also have good and contact with health care function of lead poisoning.
(5) Application in health care
Pectin is a valuable water-soluble dietary fiber. Pectin has the functions of lowering blood fat, lowering cholesterol, anti-radiation, adsorbing heavy metal ions, moistening the intestines, and anti-cancer. At present, there are products that use pectin in domestic medicines and health products, such as pectin, a gastric medicine for moisturizing and laxative, to remove heavy metal lead in the body, etc. However, the current demand for the amount of pectin is still not very big.
Different from other dietary fibers, the structural properties of pectin make it have good water solubility, high viscosity, can absorb heavy metals and other cations and toxins, promote gastrointestinal peristalsis, and can be fermented by the intestinal flora in the large intestine. Chain fatty acids lower the pH of the intestinal tract, kill harmful bacteria, and promote the proliferation of beneficial bacteria. Studies have also shown that pectin can play a role in preventing cancer.
(6) Other applications
In addition, pectin can be used in plastic wrap, diapers, cosmetics and toothpaste by taking advantage of its good water retention and radiation resistance.
The dietary fiber of pectin is an important substance for maintaining human health. It has the function of enhancing gastrointestinal peristalsis and promoting nutrient absorption, and has a good effect on preventing and treating hypertension, intestinal cancer, urinary disease, obesity and other diseases.
Method for making low methoxy pectin
Pectin lipase is used for degreasing to extract low-methoxyl pectin.
The process flow is as follows:
Pomelo peel → crushing → water washing → degreasing → gum extraction → filter press → sedimentation → filter press → desalination alcohol washing → filter press → drying → crushing → finished product.
1. Crushed raw materials: Crushed raw materials into 3～5mm size.
2. Washing: Soak in 50℃ water for 30 minutes, centrifuge, and rinse with water for 2 to 3 times until the eluate is colorless.
3. Degreasing: Add appropriate amount of sodium carbonate to activate the endogenous pe enzyme in the peel to degreasing.
4. The process conditions are the best combination of temperature 50℃, time 1h, ph7.0, and sodium carbonate of 7g/kg fresh skin (25g/kg dry skin).
5. Glue extraction: add hydrochloric acid (adjust ph 1.7 ~ 2.0) to extract the gel at 95°C.
6. Precipitation: Add proper amount of cacl2 to precipitate pectin.
7. Desalting and alcohol washing: mix hydrochloric acid and oxalic acid in a ratio of 1:3, remove the salt in the alcohol solution, and wash with alcohol for many times,
8. Drying and crushing: vacuum drying at 60°C, the dried pectin is crushed with a grinder to crush the pectin powder. The pectin yield of this method is 3.5% to 4% for fresh pomelo peel and 12% to 15% for dry pomelo peel, with a gelling degree of 100±5 and a degree of lipidation of less than 50%, which meets the American FCC quality standard.
What is low methoxy pectin
Low-ester pectin (LM) refers to pectin with a degree of esterification less than 50%. Generally, it is extracted from sunflower dish or potato, or high-ester pectin is treated with acid or alkali to perform deesterification to reduce its degree of methoxylation to obtain low-ester pectin. Low-ester pectin (also called low-fat pectin) is a kind of low-methoxy pectin, which has high reactivity to calcium ions. The gelation of low-ester pectin can be adjusted by pH and the Different calcium salts are added to control the process. Low-ester pectin can be further divided into ordinary low-ester pectin and amidated low-ester pectin.
Classification of low-ester pectin manufacturer
Low-ester pectin can be further divided into ordinary low-ester pectin and amidated low-ester pectin.
Stability of low-ester pectin
Low-fat pectin is slightly more stable under higher pH conditions. Under alkaline conditions, pectin can undergo deesterification even at room temperature. If ammonia is used for deesterification, part of the methoxy group of the methyl ester is converted to the amino group of the amide. Amidated low-ester pectin has better physical properties than other low-ester pectins and can be widely used as a gelling agent.
Factors Affecting the Strength of LM Pectin Gel
1. Quality of pectin
The molecular weight is high, the bonding area of the “egg box” model is easy to form, and the gel quality is good.
2. DE value and DA value of pectin
As the DE value increases, the gel forming temperature decreases; the DA value increases, so does the gel forming temperature; if the DA value is too high, so that the gel forming temperature is higher than the boiling temperature of the system, the system will immediately form a pre-gel.
3. Pectin content
As the content increases, the gel strength and gel forming temperature will rise, but too high will cause the formation of a pre-gel, which will decrease the gel strength.
4. Calcium ion concentration
For pectin with a certain DE value and DA value, before reaching the optimal gel strength, the calcium ion concentration increases, and the gel strength and gel forming temperature both rise; after reaching the optimal gel strength, the calcium ion concentration continues to increase, and the gel The glue strength begins to become brittle and weaker, and finally forms a pre-gel.
5. Calcium ion chelating agent
The addition or presence of polyphosphates, citrates, etc. that can chelate calcium ions in the system can reduce the effective concentration of calcium ions, thereby reducing the risk of pre-gel formation, especially when the solids content in the system is high.
6. Soluble solid content
Increasing the content of the gel increases the strength of the gel and the gel forming temperature rises, but too high results in the formation of a pre-gel.
7. Types of soluble solids
Different substances affect the binding ability of pectin and calcium ions to different degrees. Take Type2000 amide pectin as an example. Under fixed conditions such as pH=3.0, solid content=31%, and calcium ion content of 20mg/g pectin, the gel The intensity is respectively using decoction> 42DE glucose syrup> high fructose syrup> sorbitol; different types of solids have different sensitivity to calcium ions that produce pre-gel.
8. System pH
The pH can be in the range of 2.6 to 6.8. As the pH increases, more pectin or calcium ions are required to form a gel of the same quality; an increase in pH can lower the gel forming temperature.
9. How to use
If the calcium ion solution is added to the pectin solution below the gel forming temperature, it will cause the system to form a pre-gel immediately. Calcium ion solution should be added in a relatively diluted form, otherwise it will cause partial formation of pre-gel or partial non-gel formation. If a calcium salt that can only dissolve slowly is used, the formation and strength of the gel can be enhanced over time.
The gel formed by low-ester pectin, especially amide pectin, is a thermoreversible gel. If the DE value is higher and the solid content is higher, the gel formed will also have better thermal stability. Low-ester pectin has good thixotropy, and the gel can become pumping fluid under the action of shearing force. It is especially suitable for the production of yogurt with pulp. At low solids content (20%), the combination of CMC or locust bean gum and low-ester pectin can improve the texture of the gel. The combination of xanthan gum and pectin reduces the texture of the gel.
Gel mechanism of LM pectin manufacturer
1. The gel mechanism of ordinary LM pectin
The gel formation mechanism of low-ester pectin is completely different from that of high-ester pectin. Its gel is the result of the joint action of the carboxyl group between the two pectin molecular chains through the calcium bridge to achieve ionic connection and hydrogen bonding. This gel is affected by the concentration of calcium ions in the system, but it is not obvious to sugars and acids. Gel conditions of low-ester pectin: pH range of 2-6, soluble solid content of 10% to 80%, the formed gel has thermal reversibility.
The gel of low-ester pectin is affected by the degree of pectin esterification, relative molecular weight, calcium content, pH value, other substituents, cooling rate and other conditions. Among them, calcium is a necessary condition. Experiments have shown that each gram of low-ester pectin requires about 25mg of calcium. Low-ester pectins with different esterification degrees have different calcium activities. The relationship between gelation degree and esterification degree of low-ester pectin is opposite to that of high-ester pectin. The gelation temperature of low-ester pectin is inversely proportional to the degree of esterification, and there is little or no difference between the gel temperature and the melting temperature of the jelly of low-ester pectin.
2. The gel mechanism of amidated low-ester pectin
The gel mechanism of amidated low-ester pectin is similar to that of ordinary low-ester pectin. The difference is that amidated pectin requires a much wider range of calcium ion concentration for gel formation. Under application conditions, the jelly tissue is not affected by calcium. A slight change in ions affects. And the resulting jelly has a smaller tendency to separate water. It is widely used in jams with low sugar content. Compared with high-ester pectin with the same esterification degree but without amidation treatment, amidated high-ester pectin has a lower gelation temperature during use, and its gel has a high degree of thermal reversibility and thixotropy.
- The function and application of LM pectin in food industry
- The function of LM pectin
- The application of LM pectin
- Method for making low methoxy pectin
- What is low methoxy pectin
- Classification of low-ester pectin
- Stability of low-ester pectin
- Factors Affecting the Strength of LM Pectin Gel
- Gel mechanism of LM pectin