2011年1月2日 · This is a calibration curve and can be used to find the concentration of vitamin C in unknown samples such as fruit juices Repeat steps 2-6 using fruit juices of unknown concentration; these can be compared to the calibration curve to estimate concentration of vitamin C in each juice sample

2011年1月2日 · A graph of volume of vitamin C needed to decolourise DCPIP against vitamin C concentration can be used as a calibration curve to estimate the vitamin C concentration of unknown substances

Among fruits, vitamin C content was maximum in lemon (76.122 ppm) and minimum in cucumber (17.90 ppm), whereas, in vegetables, it was maximum in potato (26.107 ppm) and minimum in cabbage...

the local market are good source of vitamin C. This method (2,4 DNPH) is simple and reliable and provide excellent result for determination of vitamin C. Black current shows maximum amount of vitamin C and grapes shows minimum amount of vitamin C among these samples taken. References 1. Khan MMR, Rahman MM, Islam MS, Begum SA (2006) A simple UV

The present research deals with the comparison of the two methods for the determination of vitamin C (ascorbic acid) content in some fruits namely apples, oranges, lemons, tangerines and...

2020年10月29日 · Using a Calibration Curve. Below is a calibration curve for the determination of vitamin C (ascorbic acid [AA]) via voltammetry. This allows us to plot the current as a function of concentration. Four standards have been made (4.00, 8.00, 12.00, and 16.00 μM) and run to create the calibration curve.

After coupling with 2,4-dinitrophenyl hydrazine at 37 °C temperature for three hours, the solution is treated with 85% H 2 SO 4 to produce a red color complex and the absorbance was spectrophotometrically measured at 521 nm. The content of vitamin C were 12 to 118 mg/100 g in fruits and 22 to 135 mg/100 g in vegetables.

Calibration curves ranging from 3 to 100 µg/mL and QCs were prepared in an AA-depleted plasma (plasma kept at room temperature/exposed to light for 4 days). Replicate extractions were deposited onto a LazWell™ plate and dried before analysis.

Determination of Ascorbic acid (Vitamin C) in the Citrus Juice by the Standard Addition and Calibration Curve Methods: Principle: Ascorbic acid gives a well defined polarographic oxidation wave. Use freshly prepared diluted juice for the determination of ascorbic acid. …

The calibration curve produces a linear regression equation is Y = 0.1353 + 0.2155 with the value of the correlation coefficient R 2 of 0.9156 which shows the linearity of the equation.