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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.
The specific heat of silver is 0.235 J/g·K. Its melting point is 962°C, and its heat of fusion is 11.3 kJ/mol. What quantity of heat, in joules, is required to change 7.50 g of silver from solid at 25°C to liquid at 962°C?
While light of wavelength 420 nm is focused on a metal surface, electrons are ejected with a speed of 7.00 × 105 m/sec. Explain what is the binding energy of a mole of electrons to the metal
Explain what is the poh of a solution made by mixing 100 ml of 010 m naoh, 50 ml of .0035 M KOH, and 25 ml of .0125 M LiOH
Osmosis is the natural tendency of a substance to move from an area of higher concentration to one of lower concentration. true or false
A saturated solution of Pb(IO3)2 in pure water has a lead ion concentration of 5.0 x 10-5 Molar. What is the Ksp value of Pb(IO3)2?
Magnesium reacts with sulfuric acid according to the following equation: Mg (s) + H2SO4 (aq) ---> MgSO4(aq) + H2 (g). How many liters of hydrogen gas can be made from 65.6 g of magnesium at STP
Draw a lewis dot structure for ketoisophorone to figure out how many non bonding pairs of electrons there are in the molecule.
a photon in the gamma ray region of the electromagnetic spectrum has an energy of 9.12 times 10-14 j calculate the wave
what is the freezing point of radiator fluid that is 50 antifreeze by mass? kf for water is 1.86 cm. ethylene glycol
Explain a sample of hydrogen was prepared and collected over water at 25 °C and a total pressure of 742 torr. It engaged a volume of 288 mL.
Use the molar volume of a gas, at STP, to determine the number of moles of H2 in 1620 mL of H2 gas
If you want to prepare a buffer with a pH of 4.30 with HOAc (acetic acid) and NaOac, what ration of NaOAc/HoAc should you use? (pKa of HOAc is 4.74)
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