Lotus root is widely cultivated across our country, with the middle and lower reaches of the Yangtze River and other southern provinces being major production areas. It ranks among China's most significant export-oriented vegetables. However, one of the main challenges in its trade is the browning that occurs during storage and transportation, which negatively affects its quality and marketability. To address this issue, scientists and technicians have developed the LB series of lotus root preservatives. This innovative solution effectively prevents discoloration, decay, and weight loss, allowing lotus roots to be stored for up to one month at room temperature.
The preservation process begins with freshly dug lotus roots, which are first washed thoroughly with clean water and then cut into sections. The end parts, known as the shank sections, are removed, and the outer skin is carefully scraped off using a stainless steel scraper. Since lotus root is prone to enzymatic browning after peeling, it is essential to treat it promptly. The peeled roots are submerged in a salt solution ranging from 0.8% to 1.5% until the tissue becomes slightly soft. Afterward, they are immersed in an LB preservative solution for 40 minutes. Once treated, the lotus roots are dried using a dewatering machine. The inner lining of the machine is usually covered with cloth or rubber to prevent mechanical damage. Any excess moisture is removed to ensure the roots are dry before packaging.
To further prevent oxidation and maintain freshness, nylon plastic bags with strong oxygen barrier properties are recommended for packaging. These bags can hold between 1 to 5 kg of lotus root, depending on market demand, and should be vacuum-sealed to extend shelf life. For optimal storage, lotus root should be kept in a cool, dark place, away from direct sunlight. The ideal storage temperature is around 5°C, where treated lotus roots can remain fresh for 3 to 4 months. However, temperatures below 5°C must be avoided, as prolonged exposure to cold can cause the tissue to soften and become spongy, losing all commercial value. This problem often arises during the north-south transport of lotus root within China, leading to significant economic losses. Therefore, careful temperature control is crucial throughout the entire supply chain to maintain product quality and minimize waste.
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