In the article “Moisture Sorption Isotherms and Storage Stability of Spray-Dried Yogurt Powder” by B. Koç et al., published in Drying Technology 28(6): 816–822, there were several errors in the text. In several sentences in the article, the incorrect water vapor permeability coefficient, k, was given. Corrected text appears below:
-
On page 818, left column:
ALPE pouches (120 mm × 150 mm) were filled with 100 g of yogurt powder samples and were closed by heat sealing, avoiding any air space but without vacuum application. The water vapor permeability, k (kg*m−2*day−1*Pa−1), of the packaging material (ALPE) was measured …
… where t is the storage time (day), wd is the dry weight of yogurt powder (g), m is the moisture content of yogurt powder on % dry basis, m i is the initial moisture content (%, db) of the sample, m c is the critical moisture content (%, db), k is the water vapor permeability coefficient (kg*m−2*day−1*Pa−1), A is the area…
-
On page 820, left column:
The water vapor permeability coefficient of ALPE was 9.047 * 10−7 kg*m−2*day−1*Pa−1. The area A of pouches ALPE was 0.036 m2. By putting the values in Eq. (10), the shelf-life of the spray-dried yogurt powder was calculated as 71 days in ALPE pouches under these storage conditions.
-
On page 821, right column:
NOMENCLATURE
| k | = |
Water vapor permeability coefficient (kg*m−2*day−1*Pa−1) |
There is also a correction to the text on page 821, left column:
The shelf-life of yogurt powder in ALPE pouches at 25°C and 50% RH storage conditions was determined as 71 days based on the equilibrium moisture content of the powder, described by….
The authors regret any inconvenience caused.