Based on the two articles I have read, these have the same concept in the case of antioxidant properties. One of them has mentioned, “IC50 value is a concentration of a sample required bự inhibit 50% of radical” (Molecules 2009, 14, 5349-53610). Và another one has mentioned, “the EC50 is a concentration of a sample required to obtain a 50% antioxidant effect” (Food Chemistry Volume 138, Issue 1, 1 May 2013, Pages 414-420).

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The efficient concentration at different times EC50,t (mg extract mg-1 DPPH•) is the amount of the extracts in relation lớn the amount of initial DPPH•, which calculated using the following equation:where IC50,t is the inhibitory concentration at different times, defined as the concentration of extract (mg mL-1) required lớn scavenge 50 % of DPPH• và t=0 is the initial concentration of DPPH• (mg mL-1).

The efficient concentration at different times EC50,t (mg extract mg-1 DPPH•) is the amount of the extracts in relation khủng the amount of initial DPPH•, which calculated using the following equation:where IC50,t is the inhibitory concentration at different times, defined as the concentration of extract (mg mL-1) required phệ scavenge 50 % of DPPH• và t=0 is the initial concentration of DPPH• (mg mL-1).


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IC 50 is half maximal inhibitory concentration với its a measure of the effectiveness of a substance in inhibiting a specific biological or biochemical function by half (e.g. Inhibition of enzymes, affinity to cell receptors). In pharmaceutical research, it is a frequently used unit béo specify the in vitro potency of a drug. For competition binding assays và functional antagonist assays IC50 is the most common summary measure of the dose-response curveEC50 is when the half of ts maximal effect is observed. The EC50 of a quantal dose response curve represents the concentration of a compound .The concepts of IC50 với EC50 are fundamental béo pharmacology. The EC50 is the concentration of a drug that gives half-maximal response. The IC50 is the concentration of an inhibitor where the response (or binding) is reduced by half.Seems simple enough. But when you actually go phệ fit data lớn determine these values, there are several complexities với ambiguities.

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The rest of this article is about IC50 (I for inhibition, for downward sloping dose-response curves). All the ideas can be applied to stimulatory curves cùng EC50 (E for effective) as well.Can IC50 và EC50 be same of the drug? Suppose if we plot the dose response curve using % cytotoxicity by MTT assay in case of death caused by virus, which is inhibited at various concentrations of drug? X axis involves virut alone cùng virus in combination with various concentration of drug cùng Y axis has % cytotoxicity. How béo calculate IC50 cùng EC50 from this graph?in order bự evaluate the antioxidant activity in my plant extract i did the DPPH essay. I want mập express my result but i’m confused because the effective concentration at which the DPPH radical was scavenged by 1/2 is mentioned as EC50 in some articles và IC50 in others.What is the meaning of IC 50 value in case of DPPH không tính phí radical scavenging method với how it is related with the antioxidant activity???I prepared Trolox working solution at different concentration – 0, 200, 500..800 uM in 10 ml abs MeOH. DPPH was used as antioxidant assay.For antioxidant activity procedure, 0.15 ml of each Trolox working solution was added lớn 2.85 ml DPPH assay. Absorbance (515 nm) vs Trolox conc. Gave linear correlation (R2=0.96776).

Working solution of sample was prepared by dissolving đôi mươi mg dried sample in 10 ml abs MeOH, then 0.15 ml of it was mixed with 2.85 DPPH assay. Let say I got a certain absorbance value corresponding khủng 200 uM Trolox, how could I chuyển đổi it béo Trolox equivalent / (g-dry mass)? I confused whether béo multiply the denominator with 10 ml or 0.15 ml. Thank you.I am testing antioxidants with the use of DPPH. Can anyone explain khủng me whether mập use methanol/ethanol, how much of each concentrations I should use or how to work it out và what would be the best intervals etc.?I am a little confused as all literature varies in different ranges, so basically an easy protocol lớn follow would be of great help. Also, what else should I test for khủng validate antioxidant activity khủng go alongside the DPPH?What is the significance of IC50 value when the drug is exogenously administered béo an animal tissue?I have data for antioxidant activity on Excel sheet với I draw scatter chart with the equation: y = 1.3534 x + 0.58, với R² = 0.9927. I want bự calculate the IC50 for inhibition %. Someone can help me to figure out how khủng calculate IC50 value?In addition, some of my colleagues use a function called “Growth” in Excel bự calculate IC50 by just by selection inhibition data column cùng then choose Growth from Insert Function (fx = ) và obtaining the result. Is it a correct way? i have completed DPPH assay with Trolox as a standard. How vì i express my results in Trolox equivalent/g dry weight?Effects of Solvents on the In-vitro Antioxidant Activity of Dennettia tripetala G. Baker cùng Milicia excelsa (Welw.) C. Berg Root Extracts