What are the benefits of hot-air drying lemon? Explaining the difference from other drying methods

Lemon is the fruit of a citrus classified in the genus Citrus of the citrus family.

With its vivid yellow, distinctive acidity, and fresh aroma, it's beloved worldwide. Said to be native to northern India, it was introduced to Japan in the Meiji era. Today, while domestic lemons are grown in Hiroshima, Ehime, and Wakayama Prefectures, imports from the United States, Chile, and South Africa also circulate year-round.

What sets lemon apart from other citrus is its overwhelming acidity and the richness of its aroma components. The peel concentrates aroma components like limonene and citral, making it prized across a wide range of industries—food processing, confectionery, beverages.

Nutritional components of lemons

A Treasury of Vitamin C

Lemons are known as a fruit rich in vitamin C.

Vitamin C is known as a nutrient involved in collagen synthesis. It is a water-soluble vitamin that is sensitive to heat, so eating it raw is also recommended.

Acidity Containing Citric Acid

Citric acid, the main source of lemon's sourness, is a component involved in the citric acid cycle that produces energy in the body. Some people use it for refreshment after meals.

Other Notable Components

Lemons contain polyphenols such as eriocitrin and hesperidin. The peel also contains a polyphenol called rutin.

Also, the fresh aroma component "limonene" has a relaxing effect, and is a component drawing attention for promoting blood circulation. Potassium is contained as a type of mineral, and calcium is contained as a type of mineral.

the difference between domestic and imported lemons

Features of Domestic Lemons

Domestic lemons are characterized by thin peel and rich aroma.

Grown in Hiroshima, Ehime, and Wakayama Prefectures and others, with a season around September to January. With little concern over residual pesticides or fungicides, being able to use them safely down to the peel is the greatest appeal. They're easy to process into marmalade and lemon peel, and product development that draws on the strong aroma and peel quality is increasing.

Features of Imported Lemons

Imported lemons from the United States, Chile, South Africa, and others have a high juice yield, suiting commercial beverages and large-scale cooking. Because they're supplied stably year-round, they're on supermarket shelves all year. However, with issues of wax treatment and post-harvest pesticides, there are cases where confectionery and beverage makers find peel use difficult.

They're generally chosen based on "whether to prioritize peel aroma" or "whether to prioritize juice yield," according to use.

Uses of Lemon by Form

The Appeal of Fresh Lemons

Fresh lemons are a highly versatile raw material that combines the three elements of aroma, acidity, and color. The juice is used for acidifying beverages and dishes, and the peel is used in confectionery, dressings, flavored oils, and more. Diverse processing is possible for each use—slices, rounds, zest, and so on.

However, aroma and acidity fluctuate easily by harvest timing, and temperature management to maintain freshness and a short shelf life become challenges. For commercial use, minimum lots can reach the scale of several hundred kg, and given it's a fruit with large seasonal variation, planning annual procurement is required.

The Convenience of Dried Lemons

Dried lemons made by hot-air drying are widely established as an easy-to-use ingredient. Round-sliced dried lemons are used in beverages, granola, baked goods, and more, and because the peel aroma remains well, they excel at visual appeal too.

However, hot-air drying has the challenge that heat somewhat weakens the lemon aroma and changes the acidity. For that reason, in premium lines for beverages or products that prioritize aroma, there are cases where fresh lemons or a different processing technique are chosen.

Other Processing Forms

Secondary-processed lemons such as "paste" and "powder" that raise shelf life are drawing attention. These make stable year-round supply and a wider scope of product planning possible, becoming a highly versatile ingredient for food makers.

Summary: Bring Lemon's Possibilities into Everyday Life

Lemon, as a citrus fruit with a distinctive acidity and fresh aroma, is indispensable to our diets.

Containing an abundance of nutrients including vitamin C, lemons are popular with beauty-conscious people and those looking for a change of mood. Japanese-grown and imported lemons each have their own characteristics and are used according to purpose.

By understanding the characteristics of each form—fresh, dried, powder—you can use lemon effectively across a wide range of scenes: cooking, beverages, confectionery. Why not bring lemon's three elements of aroma, acidity, and color into everyday life for a healthy, richer diet?