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Effect of drying on yield and calorific values of extractables from leafy spurge ( Euphorbia esula )
Author(s) -
Wiatr Stanley M.
Publication year - 1984
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260260407
Subject(s) - dehydration , chemistry , yield (engineering) , heat of combustion , biomass (ecology) , euphorbia , polyphenol , leafy vegetables , botany , food science , agronomy , organic chemistry , materials science , biology , biochemistry , antioxidant , metallurgy , combustion
The effect of dehydration on yield and calorific values has been investigated for oils, hydrocarbons, and polyphenols extracted from leaves of Euphorbia esula/ (leafy spurge). Methods of dehydration employed were with a warm oven (50°C), a hot oven (105°C), at room temperature (25°C), and with freeze drying. Generally, dehydration resulted in a loss of yield for all extractives. Noteworthy exceptions were oil yields from the warm‐oven‐ or air‐dried biomass which did not differ significantly from fresh tissue. Significant differences in calorific values (range 4643–5192 cal/g) were observed for each category of whole leafy biomass dehydrated as indicated above. Dehydration reduced the calorific value of oils (range 9483–10,095 cal/g) but tended to increase the calorific values of polyphenols (range 4178–6033 cal/g). NMR spectroscopy of the oil fraction suggested that dehydration did not grossly alter the composition of oils, despite differences in yield and calorific values.