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Summary
Iceberg lettuce (Lactuca sativa var. capitata L.) is an important
ingredient in salads. However, there is always a challenge in this kind
of fresh-cut commodity: browning, namely the brown color happened
on the surface of the product which severely affects the buying
willingness of consumer. After fresh-cut, the activity of
phenylalanine ammonia-lyase (PAL) increased as following that
induced higher content of phenolic compounds in the cell. Under the
catalysis of polyphenol oxidase (PPO) and phenol peroxidase (POD),
these phenolic compounds turned into substances that appeared
brown color. We tried to inhibit browning through three different
methods: heat, nitric oxide (NO) and chlorinated water. After the 45
℃,90 s heat treatment, the activity of PAL in cells significantly
decreased and successfully prolonged the shelf-life up to 10 days.
Treated with NO fumigation or NO donor compound, DENANO, the
effect of PPO and POD catalysis was inhibited which led to a longer
shelf-life of the product. Dipped in 100µL·L-1
chlorinated water for
180 s, the content of phenolic compounds in cell decreased and
prolonged the shelf-life up to 9 days. Among the methods we applied,
the combination of heat and chlorinated seemed to have bigger
potential in business development for the reason to reduce dosage of
chemical compounds and elevate the efficiency of following process.