All determinations were carried out in triplicate. Tha means that I have to include also this dilution factor for my standard curve? The capacity of plant extracts (500 μg/mL) to directly react with and quench free radicals was evaluated as described earlier [25]. Daten über Ihr Gerät und Ihre Internetverbindung, darunter Ihre IP-Adresse, Such- und Browsingaktivität bei Ihrer Nutzung der Websites und Apps von Verizon Media. My doubt is about the Gallic Acid Curve. %%EOF
Reaction with Folin-Ciocalteu solution: - I add 0.5 ml of my clear extract in a 50 ml flask. Similar to phenolic content leafy vegetables had higher flavonoid content compared to fruit crops. The assay was performed in 96-well plates. SJ�)�����_7#�S����ڡ��WM/��""��W�����L��6 ���po�9^�|����cĶ ����@��9I�)!��O;R�WZ�K�wk. The F-C assay has been used as a measure of total phenolics in natural products, but the basic mechanism is an oxidation/reduction reaction5. Can I please get step by step help for my TPC calculations. %PDF-1.4
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I am trying to calculate the phenol amount using gallic acid as standard and i try to express the amount of phenols as mg GAE (Gallic Acid Equivalents) / gram sample. Radical scavenging activity of aeroponically grown crops was found comparable to those grown in the field. Table 1 shows the comparison in the average crop yield per plant, average fruit weight, and average number of fruits per plant in different crops grown in aeroponic growing systems (AG) and in the field (FG). The differences in phenolic content, however, were not found to be statistically significant for all the leafy vegetables (basil, LSD = 32.50, ; chard, LSD = 41.15, ; parsley, LSD = 18.00, ; red kale, LSD = 22.79, ) while grown in two types of cultivation systems. A standard gallic acid curve was constructed by preparing the dilutions of (0.1, 0.5, 1.0, 2.5 and 5 mg/ml) in After 6 mins, 625 microliters of 7% sodium carbonate is added followed by 500 microliters of sterile distilled water. �0�0aO�1�Д�/�p�J���@���`��[}`��$��@�S��Hp"}kp������K����n4έAp�.Bj�>y�l���"'x�T��}��}~.�E\��K@q�c���7Q�o���|ir�[��!-m頕�r�J�88��wy6�"���(y.�n7���e�L&�ݼ�}��;�O��5n�zA��n�\�^�j^�(�ݮ���'��O�~��N�ǧ�T�URz:�*o0����b//��#���{Ȉ}�]��y�,�����Y����_��f�����ӄ�q[�:n�v5�]����7��w��ȍ�O�qo�8M�xA���S����tQd��O�4�V�;��?�?� The results for total phenolic and total flavonoid content in the studied plant extracts are presented in the graph. The solvent was evaporated at 40°C under a reduced pressure. Percent DPPH radical scavenging activity was calculated as follows: ��""h�iJ��T�Ĉ��J��J�HJ5J�H /����9�e�,.�I���v�Sr��/�հ�T]
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.���}�%?��*a@X0��(F�ˤp�-��ۅ���I�(H�tЋ�_��� �R�'N��!.g�ӊD������e�a�T�a"��Ѐy���x��^�βi�H�`t�J�Y�S�����x���_��{'�z0��x�N�~X�I1yn�|�lѽs�. Figure 1 shows the total phenolic content in the samples of different leafy vegetable and fruit crops grown in Tower Garden aeroponic systems and in the soil. EXPERIMENT 5 : TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITY FROM PLANT MATERIALS 5.1 OBJECTIVE Evidently, the rest of the proportion of antioxidant activity comes from nonphenolic compounds such as vitamins and carotenoids [46]. However, the TPC will be expressed as GAE/g of either fresh or dry tomato. Stock quercetin solution was prepared by dissolving 5.0 mg quercetin in 1.0 mL methanol, then the standard solutions of quercetin were prepared by serial dilutions using methanol (5–200 μg/mL). You must claculate the extraction yield, i.e., you must know the mass of extract that you obtained. 88 0 obj
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since you did not use extract. now can any one explain how can i got quercetin equivalent microgm/g of dry powder extract for TFC. Given the following: weight of sample = 0.1 g; Absorbance at 760 nm = 0.342 After 5 min, 1 mL of saturated sodium carbonate solution (8% w/v in water) was added to the mixture and the volume was made up to 3 mL with distilled water. The antioxidant activity of phenolics is mainly due to their redox properties, which allows them to act as reducing agents, hydrogen donors, and singlet oxygen quenchers [33, 35, 36]. The total phenolic contents of the alcoholic and aqueous extracts were found to be 326.28 and 319.14 mg/g of the Gallic acid equivalent (GAE), respectively. The UV and IR spectra of the alcoholic extract of Gul-e-Zoofa were recorded using a spectrometer. - I added 2.5 ml of FCR, 7.5 ml of a Sodium carbonate solution (200g NACO3 in 1 L water) and brought the volume to 50 ml with distilled water. The results showed that Chukrasia tabularis belonging to the family Meliaceae is the richest source of phenolics and flavonoid (total phenolic content: 17.2 mg GAE/g and total flavonoid content… That extract will stored in sealedcontainers at room temperature until use. 1587 0 obj
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I calculated 1.37 mg GAE/g? 3. The fluorescence characteristics of the powdered drug were also observed. The total phenolic content was determined quantitatively using the Folin Ciocalteu reagent, with Gallic acid as the standard. 0
I would be glad if someone can provide me a link to research journal regarding this matter since most of the journals that I've found didn't show how they calculate TPC and TFC. Among the leafy vegetables, the highest phenolic content was found in chard (57.73 mg GAE/g dry wt., in FG and 53.45 GAE/g dry weight in AG) followed by basil, red kale, and parsley. Samples were extracted with 75 mL (95% v/v) ethanol at 40°C for 10 min; the extraction process was repeated thrice. Suman Chandra, Shabana Khan, Bharathi Avula, Hemant Lata, Min Hye Yang, Mahmoud A. ElSohly, Ikhlas A. Khan, "Assessment of Total Phenolic and Flavonoid Content, Antioxidant Properties, and Yield of Aeroponically and Conventionally Grown Leafy Vegetables and Fruit Crops: A Comparative Study", Evidence-Based Complementary and Alternative Medicine, vol. �Ȃ�+`�?`�vɝ"mo I��A�i�,��l��4_$���00]r�F�����0 i�a
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