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Manganese has variable oxidation states and appears as Mn(III) with
redox function. It plays an important role in numerous biological
processes associated with utilization or generation of hydrogen
peroxide or dioxygen. The functions of these type are known viz
manganese superoxide dismutase, manganese catalase, manganese
peroxidase, manganese ribonucleotide reductase and oxygen involving
complex in photo system-II. This has prompted to under take the
coordination of Mn(III) ions with ligands. The oxygen donar ligands
used for the coordination are -diketones since -diketones anions
are powerful chelating species and they give stable Mn(III) complex
which can further be used for preparing other Mn(III) species that
can be used as catalysts. The tris ( -diketonate) Mn(III) complex
gives substitution as well as addition reactions with other
ligands. Here propylenediamine used as anitrogen donar ligand. The
nitrogen donar atom ligands ultimately result in the mixed ligand
complexes for Mn(III) which are more stable in this oxidation state
of manganese. In this way the aim of preparing stable Mn(III)
complexes is achieved by the oxygen donor atom and nitrogen donor
atom ligands."
Manganese has variable oxidation states and appears as Mn(III) with
redox function. It plays an important role in numerous biological
processes associated with utilization or generation of hydrogen
peroxide or dioxygen. The functions of these type are known viz
manganese superoxide dismutase, manganese catalase, manganese
peroxidase, manganese ribonucleotide reductase and oxygen involving
complex in photo system-II. This has prompted to under take the
coordination of Mn(III) ions with ligands. The oxygen donar ligands
used for the coordination are -diketones since -diketones anions
are powerful chelating species and they give stable Mn(III) complex
which can further be used for preparing other Mn(III) species that
can be used as catalysts. The tris ( -diketonate) Mn(III) complex
gives substitution as well as addition reactions with other
ligands. Here nitrogen donar ligands used are ethylenediamine. The
nitrogen donar atom ligands ultimately result in the mixed ligand
complexes for Mn(III) which are more stable in this oxidation state
of manganese. In this way the aim of preparing stable Mn(III)
complexes is achieved by the oxygen donor atom and nitrogen donor
atom ligands."
Manganese has variable oxidation states and appears as Mn(III) with
redox function. It plays an important role in numerous biological
processes associated with utilization or generation of hydrogen
peroxide or dioxygen. The functions of these type are known viz
manganese superoxide dismutase, manganese catalase, manganese
peroxidase, manganese ribonucleotide reductase and oxygen involving
complex in photo system-II. This has prompted to under take the
coordination of Mn(III) ions with ligands. The oxygen donar ligands
used for the coordination are -diketones since -diketones anions
are powerful chelating species and they give stable Mn(III) complex
which can further be used for preparing other Mn(III) species that
can be used as catalysts. The tris ( -diketonate) Mn(III) complex
gives substitution as well as addition reactions with other
ligands. Here nitrogen donar ligands used are ethylenediamine,
propylenediamine and hexamethylenediamine. The nitrogen donar atom
ligands ultimately result in the mixed ligand complexes for Mn(III)
which are more stable in this oxidation state of manganese. In this
way the aim of preparing stable Mn(III) complexes is achieved by
the oxygen donor"
Ascorbic acid also known as vitamin C. Vitamin C is Ascorbic acid
also known as vitamin C. Vitamin C is very essential for growth and
maintenance of the human body. It is necessary for the normal
formation of protein collagen, which is an important constituent of
skin and connective tissue. The deficiency of vitamin C causes is
known as disease "Scurvy." Vitamin C is present in all citrus
fruits, gooseberry (Aonla), tomato, apple, pine apple, grapes and
other foods. The vitamin C is very sensitive to heat, light, air
and strong alkali. Most of the part of vitamin C is lost during
heat treatment (processing) like blanching, boiling, cooking,
cooking under pressure and sterilization of foods. The apple,
lemon, pine apple, grapes, guava, ripe mango, was heated to 60 C,
70 C, 80 C, 90 C and 100 C for different time viz. 15, 30, 45, 60,
75, 90 and 105 minute in constant temperature. The loss of vitamin
C is less at low temperature. As, the time of heating is increase,
the loss of vitamin C increase. The maximum loss of vitamin C has
been found in the first 15 minutes of heating at different
temperature, then, further rate of loss of vitamin C becomes lesser
due to presence surface oxyge"
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