Drying and Quality

Valverbe produces its tea bags following a supply chain logic that goes from seed to finished product.
One of the most important stages of this process involves drying the herbs, which depends on multiple factors related to conservation, aroma, and the active ingredient content of the final product.
Drying involves significant chemical and physical changes to the plant tissue, and the dehydration process helps stabilize them by stopping the enzymatic degradation processes that affect the plant immediately after cutting.
Our cooperative has invested heavily in this phase, purchasing a unique cold-drying system in Italy – using CFT® technology – which, unlike the traditional hot-drying process, preserves the cell membrane intact, and with it, all the properties of the plant.

Preservation of Plant Properties

La tecnica consiste nel ricreare all’interno della camera di essiccazione le condizioni della brezza serale, cioè di quel momento della giornata in cui per le leggi fisico – botaniche che regolano il mondo vegetale, si attiva lo scambio tra la parte aerea e l’apparato radicale della pianta mediante l’apertura degli stomi (bocca) cellulari rimasti fino ad allora chiusi per difendersi dalla canicola. L’impianto da noi utilizzato è stato programmato per essiccare circa 8 q.Li di pianta fresca in 48 ore. Le piante appena raccolte, vengono sistemate in una struttura di acciaio ermeticamente chiusa, all’interno della quale viene fatto circolare un flusso d’aria fresca e secca che – per le condizioni sopra descritte – stimola in pochi minuti l’apertura della bocca cellulare e con essa il deflusso dell’acqua contenuta nei tessuti. Nel corso del 2006 è stato fatto da Valverbe –su due campioni di erbe essiccate nei due diversi modi– un primo step di ricerca sensoriale mediante panel test in tripla cieca , e contemporaneamente un raffronto sui principi attivi presenti su due campioni di erbe essiccate nei due diversi modi.

Traditional Hot Drying

Start of Drying

The cell membrane is intact

First stage

Cell membrane rupture and liquid release (6–8 hours of mechanical action)

Ending

Disintegration of the cell membrane with the breaking of the botanical sequence

Essiccazione a freddo adottata da Valverbe

Start of Drying

The cell membrane is intact

First phase

Opening of the cell stomata with the release of vegetation water

Ending

The cell membrane remains intact, and the cell stomata stay open

Essiccazione a freddo adottata da Valverbe

Start of Drying

The cell membrane is intact

First phase

Opening of the cell stomata with the release of vegetation water

Ending

The cell membrane remains intact, and the cell stomata stay open

Traditional Hot Drying

For sanitizing the herbs, Valverbe carries out a bacterial load reduction cycle with a heated silo at 115°C, bringing the herb mixture to a temperature of about 80°C for 3 minutes. This process does not damage the organoleptic properties or the active ingredients of the plants, as it works without moisture (unlike the traditional saturated steam systems). The processed product is then packaged in single-use 10 kg bags, ready to be moved to the packaging stage.

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