id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-13500		cet-13500		6	.pdf	application/pdf	3258	129	47	Nomenclature 𝐶 – concentration of polyphenols in water, g/l 𝐶𝑒 – equilibrium concentration of polyphenols in water, g/l 𝐶𝑖 – concentration of polyphenols in water at the end of the 𝑖-th cycle, g/l 𝑘 – linear partition coefficient, l/g 𝑀 – mass of solid matrix, g 𝑞𝑒 – equilibrium concentration polyphenols in solid mass of hazelnut skins, g/g 𝑞𝑡𝑜𝑡 – total amount of extractable polyphenols in solid mass of hazelnut skins, g/g 𝑉 – volume of solvent, l 𝛼 – solid-liquid ratio , g/l References Capparucci, C., Gironi, F., & Piemonte, V. (2011). 3. Results 3.1 Quantification of total extractable polyphenols from hazelnut skins and of extraction time The total amount 𝑞𝑡𝑜𝑡 of extractable polyphenols per mass of solid matrix was calculated through a mass balance extended to all the extraction cycles of each test as follows: 𝑞𝑡𝑜𝑡 = 𝑉𝐿 𝑀𝑆 ∑ 𝐶𝑖 𝑁 𝑖=1 = 1 𝛼 ∑ 𝐶𝑖 𝑁 𝑖=1 (1) where 𝑉𝐿 and 𝑀𝑆 are the liquid volume and the solid mass loaded at the beginning of the test, respectively, and 𝐶𝑖 is the concentration of polyphenols in the aqueous solution at the end of the 𝑖-th cycle of the test; the ratio between 𝑉𝐿 and 𝑀𝑆 coincides with the reciprocal of the solid liquid ratio 𝛼. The calculation of 𝑞𝑡𝑜𝑡 was repeated for all tests, each characterized by a different number 𝑁 of cycles.	cache/cet-13500.pdf	txt/cet-13500.txt