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Pigments are responsible for many of the beautiful colors that we see in the plant world. For instance lycopene is the red pigment responsible for the color of tomatoes. Also spinach leaves contain mainly chlorophyll-a, chlorophyll-b, β-carotene and smaller amount of lutein which is better known as vitamin A. Recent epidemiological studies have suggested that the consumption of tomato and spinach reduce the risk of cancer such as prostate, breast, stomach. The chlorophyll-a and beta-carotene pigments were isolated by column chromatography with alumina (Al2O3) stationary phase as polar absorbent which was suitable for chromatography of less polar compounds and hexane as mobile phase. Thus it makes non-polar beta-carotene pigments to elute faster. In the other hand more polar pigments such as chlorophyll-a make strong interactions and hence it remained more time in the column. Therefore, once β-carotene is eluted, a more polar solvent mixture of hexane-acetone(90:10) is used to elute the more polar chlorophyll-a. Acetone is more polar than hexane as it has a net dipole moment.
Moreover, the lycopene pigment in tomato paste was isolated by separating funnel which is used for the separation of components of a mixture between two immiscible liquid phases.
a tire holds air assume its all n2 at a pressure of 3 atm and in one week the pressue drops by 1 because of inevitable
Determine how many milligrams of H 2 O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C?
the specific heat of an unknown metal is found to be 0.233 j kg. the law of dulong and petit predicts a molar heat
N2O4+ 2 N2H4= 3 N2 + 4 H2O, Determine the limiting reactant and the mass in grams of nitrogen that can be formed from 50.0g N2O4 and 45.0g N2H4. The molar masses are as follows: N2O4=92.02g/mol, N2H4=32.05g/mol.
A sample has a specific heat of 0.155 cal/g·°C. How much energy will be required to raise the temperature of the sample from 20.0°C to 35.0°C if the sample has a mass of 8.0 g?
What are some of the characteristics that we want to observe? What might be your initial hypothesis? How would you set up an experiment to test your hypothesis?
What is the concentration of the exact composition of the rock salt/ water solution used on the roads? Why were we not able to use this composition in our experiment
In this experiment we reduced methylene blue with ascorbic acid using HCl as a catalyst. Given that the half reaction for the reduction of methylene blue is MB+(ox) +2H +2e -----> MBH2
A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature rose from 35.0 to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ/°C, what is the value of DH°rxn. The molar ma..
A 782 mL gas sample at STP is compressed to a volume of 131 mL, and the temperature is increased to 22?C. What is the new pressure of the gas in Pa?Answer in units of Pa.
After the reaction was complete, the solid residue, consisting of KNO2 and the original impurities, had a mass of 24.1 g. Assuming that only the potassium nitrate had decomposed, how many grams of KNO3 were present in the original sample? Answer i..
c3h8g 5o2g-gt 3co2g 4h2ol ho -2220 kjmolpropane is often used for gas grills and is typically purchased by filling a
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