Microwave Drying Kinetics of Thyme
Kinetika mikrotalasnog sušenja Thymbra cpicata-e
Pregled/ Otvaranje
Autor
Soysal, Yurtsever
Serdar, Oztekin
Eren, Omer
Ključne reči
timbramenta
sušenje
mikrotalasna sušara
vreme sušenja
stepen sušenja
boja
thyme
mint
drying
microwave
drying time
drying rate
colour
Metadata
Prikaz svih podataka o dokumentuApstrakt
Thyme (Thymbra spicata L.) leaves were dried in a domestic microwave oven
to determine the effects of microwave output power on the drying time, drying rate, and
the colour of the dried product. Seven different microwave output powers ranging from
360 W to 900 W were used in the experiments. Drying of thyme and mint leaves took
place mainly in falling rate period with no constant rate period. Increasing the
microwave output power resulted in a considerable decrease in drying time. The semiempirical
Page’s equation used to describe the drying kinetics of leaf materials gave an
excellent fit for all data points with values for the coefficient of determination (R2)
greater than 0.997 and the standard error of estimates (SEE) lower than 0.023. The value
of the drying constant showed an increasing tendency with the increased microwave
output power signifying that with increase in microwave output power, drying curves
become steeper indicating faster drying of the products. Both the traditional in-shade
drying and microwave drying techniques used in this study caused some undesirable
effects on the colour of the thyme and mint leaves. The traditional in-shade drying
produced a darker brownish green product. Based on the overall colour evaluation
results, compared to traditional in-shade drying, more stable green colours similar to
those of the original fresh materials were obtained by using microwave output powers of
810 and 900 W for thyme and 720, 810, and 900 W for mint. Lišće Thymbra cpicata-e je sušeno u mikrotalasnoj sušari kako bi se odredio
uticaj snage sušare na vreme sušenja, stepen sušenja i boju osušenog proizvoda.
U eksperimentu je korišćeno sedam tipova mikrotalasnih sušara snage od 360 W do
900 W. Povećanje snage sušare rezultiralo je značajnim smanjenjem vremena sušenja.
Poluempirijska Pejdžova formula (Page’s) koja se koristi za opis kinetike sušenja
lisnatih materijala, pokazala je dobro uklapanje za sve tačke sa vrednostima koeficijenta
determinacija (R2) većeg od 0.997 a standardna greška je bila niža od 0.023. Vrednost
konstante sušenja pokazala je tendenciju porasta sa povećanjem snage sušare ukazujući
da sa povećanjem snage sušare krive sušenja postaju strmije ukazujući na brže sušenje
proizvoda. I tradicionalno sušenje proizvoda u senci i korišćenje mikrotalasne sušare su
tokom ovog istraživanja pokazali određene negativne posledice na boju listova timbre i
mente. Tradicionalno sušenje u senci je uzrokovalo pojavu tamnije braon boje na
proizvodu. Obzirom na izvršenu analizu boje i upoređenjem sa proizvodima sušenim na
tradicionalni način, postojanija zelena boja je uočena kod lišća timbre kod sušara snage
810 i 900 W, i 720, 810 i 900 W za mentu.