Recently, a groundbreaking invention titled "Application of Polyhexamethylene Dihydrochloride in Controlling Citrus Acid Rot and Its Preservative" has been granted a national invention patent. This innovation was developed by researchers from the South China Botanical Garden, part of the Chinese Academy of Sciences. The study focuses on improving post-harvest preservation techniques for citrus fruits, which are among the most widely consumed fruits globally.
Citrus fruits, such as oranges and mandarins, are classified as non-climacteric fruits, meaning they do not continue to ripen after harvest. However, their post-harvest metabolic activity remains high, leading to rapid deterioration in quality, flavor, and nutritional value. Sugar oranges, in particular, are known for their thin skin and juicy flesh, but they are also highly susceptible to post-harvest diseases, making them difficult to store for long periods. Common diseases affecting these fruits include acid rot, green mold, black rot, and other forms of decay.
Currently, the most effective method for managing these diseases involves low-temperature storage combined with chemical fungicides. Popular choices include carbendazim, methyl thiophanate, imazalil, and bismuth salts like Baccarat. Despite these efforts, controlling acid rot—especially in sugar oranges—remains a challenge, as existing treatments often fail to provide satisfactory results.
To address this issue, researchers have turned to an innovative and eco-friendly alternative: polyhexamethylene dihydrochloride (PHMG). This is a newly synthesized broad-spectrum antimicrobial agent that works by targeting the cell wall and cytoplasmic membrane of pathogens. It binds to fatty acids in the phospholipid layer of the cell membrane, causing rapid disruption of the membrane structure. This leads to the leakage of cellular contents and ultimately results in the death of the pathogen, offering a highly effective bactericidal action.
According to data from the China Pesticide Network, the research team proposed using PHMG for the prevention and control of citrus acid rot. Based on this discovery, they developed a new type of preservative that significantly reduces fruit rot during storage, particularly acid rot. This breakthrough has the potential to greatly enhance the shelf life and market value of citrus fruits, providing a sustainable and environmentally friendly solution to a long-standing problem in the agricultural industry.
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