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Slowing food spoilage without chemicals: Natural tree sap gum and light extend fruit shelf life

University of Queensland studies have used a natural tree sap gum and light to extend the shelf life of fresh fruit and vegetables to combat food waste.

The Queensland Alliance for Agriculture and Food Innovation (QAAFI) research used edible coatings made from gum Arabic or acacia gum enriched with extracts from native Australian plants to stop the growth of spoilage causing microorganisms.

The research team also used light and curcumin, a compound extracted from turmeric, to deactivate fungal spores on food.

QAAFI's Dr. Maral Seididamyeh said both methods were effective in keeping food fresh for longer.

The research was published in , the , and the .

"Using our edible coating, we were able to prevent the growth of spoilage microorganisms in freshly cut capsicum for around 10 days in the fridge," Dr. Seididamyeh said.

"This was mostly due to the organic acids and phenolic compounds found in the aqueous extracts of plants like Cape York lilly pilly, boonjee tamarind, and Tasmanian pepper leaves.

"These extracts showed promising antimicrobial properties and the sensory analysis also revealed the fruit looked and smelled better.

"The curcumin-based photosensitization technique completely deactivated the fungal spores responsible for gray mold in fresh produce.

"When applied to strawberries, it reduced decay incidence and severity by 20% without compromising the fruit's color or firmness."

Dr. Seididamyeh said chemical-free methods for preventing food spoilage were in demand.

"Bacteria, viruses, fungi and parasites are becoming resistant to synthetic chemicals used to preserve food," Dr. Seididamyeh said.

"Consumers are increasingly favoring products made with natural preservatives over synthetic additives."

Food and Agriculture Organization of the United Nations' data showed 17% of food was lost to spoilage and other issues at retail outlets and in homes.

"The research results are promising, but more work is needed, especially since photosensitization is a relatively new concept in the food industry," Dr. Seididamyeh said.

"Photosensitization is already used in medicine through photodynamic therapy to destroy abnormal cells in the treatment of cancer and precancerous conditions.

"The edible gum coating, embedded with extracts from native Australian foods and leaves, and curcumin are currently quite expensive.

"To help make this a mainstream solution, further funding will be needed to refine the technology for its integration into commercial packing and processing lines."