.2.4. Determination of chlorophyll by spectrophotometry and HPLC
To measure the chlorophyll content, 20 mL of 80% acetone was
added to 5 g of each spinach sample and mixed with a
homogenizer (Ultra-Turrax T25 basic IKA-WERKE) for 1 min at
15,500 rpm, then centrifuged at 8,000 rpm for 5 min at 4 C
(Gokmen, Bahçeci, & Acar 2005), and then filtered through Whatman
No. 1 filter papers. The volume was adjusted to 25 mL and
the absorbance values were measured at 663 and 645 nm by
spectrophotometer (UV–Visible VARIAN Cary 50)
.2.4. Determination of chlorophyll by spectrophotometry and HPLCTo measure the chlorophyll content, 20 mL of 80% acetone wasadded to 5 g of each spinach sample and mixed with ahomogenizer (Ultra-Turrax T25 basic IKA-WERKE) for 1 min at15,500 rpm, then centrifuged at 8,000 rpm for 5 min at 4 C(Gokmen, Bahçeci, & Acar 2005), and then filtered through WhatmanNo. 1 filter papers. The volume was adjusted to 25 mL andthe absorbance values were measured at 663 and 645 nm byspectrophotometer (UV–Visible VARIAN Cary 50)
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