Hainan University Researchers Identify 12°C as Optimal "Sweet Spot" for Mango Preservation and Cold-Chain Logistics

Hainan University researchers discover that 12°C storage preserves mango quality by enhancing antioxidants and maintaining cell structure, optimizing tropical fruit transport.

By: AXL Media

Published: Apr 3, 2026, 10:47 AM EDT

Source: Information for this report was sourced from Tropical Plants

The Challenge of Tropical Fruit Longevity

Mangoes are among the most economically significant tropical fruits globally, but their nature as climacteric fruits—meaning they continue to ripen and respire rapidly after being picked—presents a major logistical hurdle. In many producing regions, ambient temperatures of 26°C to 30°C cause fruit to soften and decay within days. While refrigeration is a standard solution for temperate produce, tropical fruits like the mango are notoriously sensitive to "chilling injury" if stored at temperatures that are too low. New research from Hainan University has successfully identified 12°C as the ideal equilibrium point to maximize freshness while avoiding physiological damage.

Cellular Integrity and Starch Preservation

The team led by Yuanzhi Shao and Wen Li utilized microscopic observation to compare the internal structures of mangoes stored at 12°C versus 30°C. Their findings were stark: pulp cells kept at the higher temperature experienced early cell wall thinning, rapid starch depletion, and eventual cellular collapse. In contrast, those stored at 12°C maintained intact cell walls and starch granules even after 24 days. This structural stability directly correlates to the fruit’s firmness, which is a primary indicator of quality for consumers and retailers alike.

Biological Mechanisms: Antioxidants and ROS Homeostasis

The study delved into the molecular and biochemical reasons behind this preservation. At 12°C, the mangoes exhibited enhanced antioxidant defenses, specifically through the sustained activity of enzymes such as SOD and APX. These enzymes help the fruit maintain "redox homeostasis" by neutralizing Reactive Oxygen Species (ROS) and reducing malondialdehyde (MDA) accumulation—compounds that typically lead to tissue aging and rot. Gene expression profiling (qRT-PCR) confirmed that storage at 12°C upregulates key genes like MiSOD1 and MiAPX1, providing a genetic explanation for the fruit’s increased resilience.