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Lyophilizer experiment preparation

Lyophilizer experiment preparation
Keywords: freeze,dryer,

     The working principle of a freeze dryer

Fresh produce is first rapidly frozen at low temperatures (typically below -18°C) to solidify water into ice.Then, in a vacuum environment, controlled heat is applied to directly sublimate the ice into vapor, which is removed by a condenser without passing through the liquid phase. This process preserves the original nutrients, color, texture, and flavor of the produce by avoiding high-temperature damage or oxidation.The resulting freeze-dried product has minimal moisture content (as low as 1%-5%), can be stored long-term at room temperature, and rehydrates quickly.


What are the common applications of freeze-dried fruits and vegetables in a freeze-dryer?

Application Field

Common Products / Forms

Core Value / Characteristics

Healthy Snacks

Freeze-dried fruit slices (e.g., strawberry, apple), vegetable chips (e.g., okra, carrot), mixed fruit & vegetable snacks

Crispy texture, retains natural color and flavor; often serves as a healthier alternative to traditional fried snacks.

Instant Beverages & Food Ingredients

Freeze-dried fruit/vegetable powders (e.g., spinach, beetroot), instant soup cubes, freeze-dried coffee, tea powder

Quick rehydration, maximizes retention of aroma and heat-sensitive nutrients (e.g., Vitamin C); easy to mix; used as natural colorants or nutritional fortifiers.

Baking & Dessert Toppings

Freeze-dried fruit pieces in energy bars and cereals; toppings for ice cream and cakes (e.g., berries, mango)

Bright color, resistant to moisture and deformation; adds natural flavor and a crunchy texture to foods.

Catering & Prepared Meals

Freeze-dried herbs (e.g., basil, parsley), vegetables (e.g., onion, green beans) for fast food and soup bases

Fast rehydration, intense flavor, easy to store and transport; improves kitchen efficiency.

Special Diets & Nutraceuticals

Baby food (e.g., fruit/vegetable purees), medical liquid diets, raw materials for health products

Additive-free, preserves nutritional integrity, easy to digest; meets dietary needs of specific groups.

Outdoor & Emergency Food

Freeze-dried fruit/vegetable packs for hiking/camping, military rations, emergency food reserves

Extremely lightweight, long shelf life (typically 3-5 years or more), convenient rehydration; provides basic nutrition.

Agriculture & Supply Chain

Processing seasonal surplus or unsold fruits (e.g., lychee, Hami melon) into freeze-dried products

Reduces post-harvest loss, extends sales period, facilitates long-distance transport; increases agricultural value-added.


     

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