Polyethylene-starch blend polymer has already found to be a potential candidate to replace non-degradable plastic in packaging . However, the degradation of that polymer in natural ambience (soil burial test) needs to be further evaluated. The purpose of this study is to investigate the degradability of PE-starch blend polymer in soil and in liquid medium. The soil is added starch degrading bacteria isolated from natural soil.
Research in starch biosynthesis is likely to have a great impact on agriculture
and industry in coming years. Although the original purpose of research
into starch synthesis was not industrial application, it is an example of how
science, while trying to answer fundamental questions, may lead to the
manipulation of nature for beneficial purposes.
Although the basic studies of starch synthesis were carried out in England
during the 1940s, and led to the discovery of phosphorylase and Q-enzyme
(branching enzyme), the basis of our modern ideas originated in Argentina
from the work of Luis F.
After two centuries of almost absolute belief in technical and economic
progress, human society is in a period of reconsideration and elaboration of
new strategies for the ongoing new century. Progress of our civilization with an
explosive rise in world population has led to an enormously increased con-
sumption of resources and to an equal threat to the environment. Coping with
these problems requires all intellectual abilities of our society. In this endeav-
or, biotechnology is considered to play a significant role.
The rising incidence of invasive species displacing endemics
and altering water chemistry and local foodwebs increasingly
affects freshwater systems and should be considered
a water quality problem (Carr and Neary 2008). Aquatic
species have in many cases been introduced deliberately
into distant ecosystems for recreational, economic, or other
purposes. In many instances, these introductions have
decimated endemic fish and other aquatic organisms, and
they can also degrade local watersheds.
Approximately 10% of amylolytic enzymes are able to bind and degrade
raw starch. Usually a distinct domain, the starch-binding domain (SBD), is
responsible for this property. These domains have been classified into
families of carbohydrate-binding modules (CBM). At present, there are six
SBD families: CBM20, CBM21, CBM25, CBM26, CBM34, and CBM41.
In recent years, much attention has been focused on making polyethylene degradable. The purpose of this work is to make degradable film from depolymerized tapioca starch and linear- low-density polyethylene (LLDPE) grafted with anhydride maleic (MA), using peroxide benzoyl as initiator and peanut oil as compatibilizer.
Some starch-degrading enzymes accommodate carbohydrates at sites situ-ated at a certain distance from the active site. In the crystal structure of
barleya-amylase 1, oligosaccharide is thus bound to the ‘sugar tongs’ site.
This site on the non-catalytic domain C in the C-terminal part of the mole-cule contains a key residue, Tyr380, which has numerous contacts with the
We briefly review the metabolism of the chloroplast
stroma, and describe the structural modelling technique of
elementary modes analysis. The technique is applied to a
model of chloroplast metabolism to investigate viable
pathways in the light, in the dark, and in the dark with
the addition of sedoheptulose-1,7-bisphosphatase (nor-mally inactive in the dark).
Dextrin sản xuất bởi nhiệt còn được gọi là pyrodextrins. During roasting under acid condition the starch hydrolyses and short chained starch parts partially rebranches with α-(1,6) bonds to the degraded starch molecule. [ 4 ] Trong rang trong điều kiện acid tinh bột thủy phân và ngắn xích tinh bột phần phần rebranches với α-(1,6) trái phiếu đến suy thoái tinh bột phân tử.
The technological conditions of obtaining the polylactic acid-Vietnamese cassava starch blend on the mix-brabender were investigated. The optimal conditions were: temperature 160o C, reaction time 6 minutes, screw speed 45 r/min., initial material ratio in weight percentage PLA80- PEG10-TB20. Polyethyleneglycol (PEG) as a plasticizer, PN-47 as a distribution agent was used. It showed that the optimal starch content was 20 wt%. Increase in starch content lead to increase in water absorbability and weight loss of the materials.