Sulfur Dioxide(SO2)
The release of SO2 to the atmosphere is the primary cause of acid rain in the world.
Fossil fuel combustion at electric power-generating plants accounts for about70% of
the emissions.
Coal, Oil, and all other fossil fuels naturally
contain some sulfur.
Volcanic eruptions are another more localized natural source of SO2
SO2 + OH. HSO3.
HS
compounds
Enzymes responsible for synthesis
themselves synthesized
Appear effect at high level of Phytoalexins
Definition
natural antimicrobial compounds
commonly found in fruits and vegetables
Application of Organic Acids
food preservatives
Why? active against a wide range of
microorgani
Volatile matter released from the solid fuel forms
flame
around
char
by
combustion.
Char
is
the
black
solid
residue
which
glows
red
during combustion. Char is mostly carbon, while volatile matter is a mixture of various
species
including
light
gases
(such
as
CO
and
H2)
and
many
heavy
compounds
(
organisms, as well as regarding the oxidation of fats which cause rancidity. It also includes processes to inhibit natural aging and discoloration that can occur during food preparation such as the enzymatic browning reaction in apples or potatoes, etc. Some preservation methods require foods to be sealed after treatment to prevent recontamination with microbes; others, such as drying, allow food
and recycled to extraction system because most of solvent is expensive.
2. 3. Compounding
PHB obtained in the extraction process as shape of powder. This powder is transformed into pellets in an extruder to make final product. At the same time, nucleating agents and plasticizers are added to improve processability or mechanical properties.
Figure . Extraction & Compounding Step