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Đỗ văn Chương, Đặng Thị Thanh Quyên, Đỗ Văn Chương(1)

Mối quan hệ giữa độ ẩm và hoạt độ nước của chè đen thành phẩm trong quá trình bảo quản

Relationship between the moisture and water activity of black tea finished products during storage

Nông nghiệp & Phát triển nông thôn

2012

10

63-69

1859-4581

Determining the appropriate specifications in the preservation process in general tea and black tea in particular not finished the long time preservation, but also preserves the quality of tea products in a stable time. Results of research of equilibrium moisture content of tea was detennined finished tea should be stored at an ambient relative humidity 70 percent. Has been developed absorption isothenn of finished black tea at a temperature 28°C + or - 3, absorption isothenn of finished black tea that knowing one of two values of relative humidity or tea water activityb (Aw) is the graph will know the value of the other, and identify some limitations tea moisture 6.5 percent respectively Aw 0.4 is a safety zone for the preservation of tea. In determining the relationship between water activity (Aw) and moisture content of tea in different ecological zones have concluded the safety of tea moisture when stored at delta 6.0 percent, midlands 6.5 percent and 7.0 percent mountainous.

TTKHCNQG, CVv201