Detection of Duliu Vinegar

Duliu Old Vinegar, a specialty of Jinghai County, Tianjin, is a national geographical indication product of China. Duliu old vinegar is one of the three traditional famous vinegars in China, on par with Shanxi aged vinegar and Zhenjiang rice vinegar. It is named after its origin in Duliu Town, Jinghai District, Tianjin. Duliu vinegar has a long history, with a brewing history of over 300 years. The "Hejian Prefecture Annals" compiled during the Jiajing period of the Ming Dynasty recorded the custom of "brewing vinegar at the spring equinox" and "fish vinegar". According to the Tianjin Dictionary, "Duliu old vinegar was once a tribute to the palace, and together with Shanxi aged vinegar and Zhenjiang fragrant vinegar, it is known as the three famous vinegar in China. In March of the 41st year of the Qianlong reign of the Qing Dynasty (1776), when Qianlong was cruising east along the South Canal to Duliu, he was intoxicated by the waves of vinegar fragrance that floated in. He ordered local officials to bring him to taste it, and it was indeed an excellent taste. Duliu vinegar became a tribute and gained fame. On December 2, 2002, the former General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China approved the implementation of regional product protection for "Duliu Old Vinegar". The quality characteristics of Duliu old vinegar are traditional and unique in its brewing process, using high-quality rice and sorghum as the main raw materials, and selecting high-quality Daqu made from wheat, barley, and peas as the saccharification and fermentation agent. It is brewed after 3 years of steaming, alcohol fermentation, acetic acid fermentation, aging, and vinegar pouring processes. Due to the unique process secrets and long-term fermentation maturity of Duliu old vinegar, the taste is pure and strong, with a sweet and sour taste, not astringent but not dull, with a rich and rich aroma, a sauce red color, a thick texture, and a long-lasting and non moldy taste. Duliu old vinegar is not only a good food, but also an outstanding among many vinegar products in terms of disease prevention and treatment. Nutritional value of Duliu old vinegar has four major characteristics: firstly, it has a high protein content. Secondly, the amino acid composition is relatively balanced, which is basically consistent with the standards recommended by the World Health Organization. Thirdly, it contains high levels of vitamins and other nutrients. The fourth is trace elements with certain nutritional value

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