Tofu and other soy-based foods are often recommended for weight management, not only because they are low in calories, but because soybeans contain bioactive compounds that influence metabolism, digestion, and fat storage. Scientific research shows that soy products can help improve “easy-to-gain-weight” metabolic patterns and reduce the risk of obesity. People who gain weight easily usually share several physiological traits. One key factor is excess insulin secretion. Insulin promotes the transfer of glucose into fat cells, where it is stored as body fat. When insulin levels remain high, the body shifts toward fat accumulation rather than fat utilization. Another contributing factor is increased digestive enzyme activity in the small intestine. […]
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In factory-scale soy product manufacturing, spoilage is mainly caused by microbial growth, which is closely related to raw material contamination, processing hygiene, and sterilization effectiveness. Products such as tofu, soy milk, tofu skin, and dried tofu are rich in protein and moisture, making them highly sensitive to environmental and operational conditions. Soybeans naturally carry microorganisms from soil, harvesting, storage, and transportation. Due to the uneven surface of soybeans, bacteria adhere strongly and are difficult to remove completely through soaking and washing. In warm production environments, long soaking times further accelerate microbial multiplication. Heat-resistant bacteria, especially Bacillus, may survive normal cooking processes and later grow in finished products, leading to sour […]
Common Coagulants Used in Industrial Tofu Production In tofu manufacturing, the choice of coagulant directly determines protein coagulation behavior, texture, water retention, and final product stability.Industrial tofu production commonly uses four types of coagulants: calcium sulfate, magnesium chloride, glucono delta-lactone (GDL), and fermented whey. Each has distinct functional characteristics and application scenarios. Calcium Sulfate (Gypsum, CaSO₄) Calcium sulfate is one of the most widely used coagulants in tofu production. In industrial applications, cooked gypsum (CaSO₄·H₂O) is preferred due to its controllable reaction speed and stable performance. Calcium sulfate has low solubility, resulting in a slow and uniform coagulation process. This produces tofu with high water retention, a smooth surface, and […]
When freshly made tofu becomes sour within a few hours, the primary cause is rapid bacterial growth.The two most critical factors are high temperature and poor hygiene conditions during production, handling, or storage. Main Causes of Rapid Tofu Spoilage 1. High Ambient Temperature (Primary Cause) Tofu contains a high level of protein and moisture, making it an ideal environment for bacterial growth.In warm conditions—especially during summer—leaving tofu at room temperature allows bacteria to multiply rapidly, causing the tofu to spoil and develop a sour taste within hours. 2. Poor Sanitation of Equipment and Tools If tofu-making equipment, cloths, molds, or containers are not thoroughly cleaned and disinfected, residual bacteria can […]
Introduction Proper hygiene management of machinery and equipment is critical in soy food processing, including tofu, soy milk, yuba, and other soy-based products.Regular cleaning and sanitation not only ensure food safety and product quality, but also help extend equipment service life and comply with international food safety systems such as HACCP and GMP. 1. Regular Cleaning and Disinfection All equipment, utensils, and production pipelines used for processing, manufacturing, packaging, storage, and transportation must be cleaned and disinfected on a regular basis according to established sanitation schedules. 2. Sanitation of Food Contact Surfaces All food contact surfaces—including equipment, tools, and pipelines that come into direct contact with raw materials or finished […]
Introduction Maintaining strict personal hygiene standards for production operators is essential in tofu and soy food manufacturing. Proper hygiene practices help ensure food safety, product quality, and equipment protection, while also complying with international food safety regulations such as HACCP and GMP.The following hygiene requirements apply to all personnel working in soy product processing facilities. 1. Personal Cleanliness Production operators must maintain good personal hygiene at all times. This includes: Good personal hygiene reduces the risk of contamination and helps maintain a sanitary production environment. 2. Workwear and Protective Clothing Before entering the production workshop, operators must wear clean and complete protective clothing, including: Workwear must completely cover personal clothing. […]
The quality of soy products largely depends on the quality of the raw soybeans. Generally, any soybeans that are free from mold or heat damage, regardless of whether they are new or old, can be used to make soy products. New soybeans, with their bright color, plump grains, and absence of insect infestation or rodent damage, are considered the best. Compared to older soybeans, products made from new soybeans have higher productivity, a finer texture, stronger elasticity, and a better taste. Soybeans stored for too long will produce tofu with a coarse texture, poor elasticity, poor water retention, and a darker color. However, freshly harvested soybeans are not suitable for […]
Although there are many types of beans, most bean products on the market have a protein composition ratio that meets human needs, making them an ideal source of complementary protein from grains. Secondly, soybeans contain 15%–20% fat and over 50% linoleic acid, making them beneficial for preventing coronary heart disease, hypertension, and atherosclerosis. Soybeans are made from soybeans because they contain 30%–40% protein, which is high-quality protein. After further processing, bean products not only become more delicious and appetizing, but the processing also removes many unhealthy components, such as protease inhibitors, phytohemagglutinins, and phytic acid. Furthermore, the nutrients they contain undergo significant changes. For example, when processed into tofu, the […]
The calcium content of soy milk is comparable to that of cow’s milk. In addition to the calcium naturally found in soybeans, most commercially available soy milk is calcium-fortified, providing approximately 300–400 mg of calcium per 250 ml (8 oz) serving, which equals about 30–40% of the recommended daily calcium intake. It is also commonly fortified with vitamin D, vitamin A, and vitamin B12, making it a nutritionally balanced beverage. Soy milk is naturally cholesterol-free and contains very low levels of saturated fat, making it a heart-friendly alternative to dairy milk. Scientific studies have shown that the absorption of calcium from calcium-fortified soy milk is comparable to that of calcium […]
Traditional soy milk production processes generally include soybean selection, soaking, washing, grinding, pulp and residue separation, and boiling. Among these, how to use the soy milk cooking machine to boil the soy milk is an indispensable and important step in soy product production. The main purpose of boiling soybean milk is to heat it, causing appropriate thermal denaturation of the proteins. This exposes hydrophobic groups such as sulfhydryl groups, disulfide bonds, and hydrophobic amino acid side chains within the protein molecules. Increased hydrophobicity on the soybean protein surface intensifies protein molecule aggregation, creating the necessary conditions for the next coagulation step. In addition, the boiling process also serves the following […]
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