Fresh-Cut Vegetable Preservation With UV and Natural Preservatives
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Solution Overview
Problem
Existing fresh-cut vegetable technologies rely on chemical preservatives, require refrigeration, and have short shelf life, leading to microbial contamination, nutrient loss, and high energy consumption.
Innovation Solution
A control system incorporating an irradiation disinfection module, online monitoring unit, and automatic feedback module, using natural preservatives and real-time adjustments to achieve normal-temperature long-time freshness retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If chemical preservatives (sodium hypochlorite, citric acid) are added to inhibit microorganisms, then the freshness retaining time is prolonged, but chemical residues affect food safety and taste
Solution Approach 1:
The patent removes chemical preservatives from the treatment process entirely, replacing them with physical methods (ultrasonic vibration, irradiation) and natural substances (edible plant extracts). This extraction of harmful chemical agents resolves the contradiction by achieving preservation without chemical residues that compromise food safety and taste.
Solution Approach 2:
The patent replaces chemical disinfection systems with physical fields including ultrasonic vibration and irradiation. These mechanical and electromagnetic fields achieve microbial control without leaving chemical residues, thereby extending freshness while maintaining food safety and natural taste.
2Duration of action of stationary object
If vegetables are quickly cooled to 2-8°C and continuously refrigerated after pasteurization, then the freshness retaining time is prolonged to 7-14 days, but energy consumption increases and cold chain breakage leads to rotting
Solution Approach 1:
The patent replaces the thermal refrigeration system with physical field treatments (ultrasonic vibration, irradiation) and natural preservatives. This substitution eliminates the need for continuous cooling and refrigeration, achieving extended freshness retention without the high energy consumption and cold chain dependencies associated with traditional refrigeration systems.
Solution Approach 2:
The patent changes the preservation parameters from temperature-based (refrigeration at 2-8°C) to physical field-based parameters (ultrasonic frequency, irradiation dose). This parameter transformation allows the vegetables to be preserved at normal temperatures while achieving freshness retention comparable to or exceeding refrigerated storage, thereby reducing energy consumption.
3Duration of action of stationary object
If traditional fresh-cut vegetable processing is used without optimization, then the process is simple, but the freshness retaining time is only 3-5 days and relies on chemical additives
Solution Approach 1:
The patent combines multiple preservation mechanisms into an integrated system: ultrasonic vibration for cell wall reinforcement, irradiation for microbial control, and natural plant extracts for antioxidant activity. This merging of physical and chemical approaches achieves extended freshness retention (over 7 days) while avoiding synthetic chemical additives, balancing enhanced functionality with acceptable system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Eliminates chemical additives, reduces energy consumption by avoiding refrigeration, and extends shelf life to over 7 days with improved microbial control and nutrient retention.
Implementation Method 1
controls irradiation disinfection equipment and a sprayer, so that ultraviolet rays are used to assist in sterilization
Implementation Method 2
The online monitoring unit performs, through a sensor, real-time detection on the vegetables being disinfected
Data Source
AI summary
A normal-temperature long-time freshness retaining method is provided, which relates to the field of processing and freshness retaining of fresh-cut vegetables. An irradiation disinfection module and an online monitoring unit are included. The irradiation disinfection module is in charge of disinfecting cut vegetables. The irradiation disinfection module controls irradiation disinfection equipment and a sprayer, so that ultraviolet rays are used to assist in sterilization while a natural preservative is sprayed, thereby achieving a purpose of efficient combination and freshness retaining. The online monitoring unit performs, through a sensor, real-time detection on the vegetables being disinfected, to ensure that vegetable disinfection meets a production standard, and transmits a detected result to an automatic feedback module. Meanwhile, because of non-toxic and environmentally-friendly characteristics, a natural component is more in line with a healthy consumption need.