Volume 14 July 2009
http://dr.lib.sjp.ac.lk/handle/123456789/764
2024-03-28T23:28:17ZUse of Dried Papaya Milk in Chitosan Manufacture
http://dr.lib.sjp.ac.lk/handle/123456789/1089
Use of Dried Papaya Milk in Chitosan Manufacture
Yapa, P.A.J.; Silva, A.; Senarath, W.T.P.S.K.
A new method for the production of chitosan from shrimp waste using dried
papaya milk (OPM) has been developed. It involves the treatment of
demineralized (with 4% HCI) shrimp waste with OPM followed by
deproteinization with 3% NaOH and deacetylation with 50% NaOH. The use
ofOPM brings about considerable reductions in the amount ofHCI (20%) and
NaOH (40%), which are known to cause env.ironmental pollution problems.
Typically, the degree of deacetylation (~O) of resulting chitosan was (67%)
comparable to DO of conventional methods. Moisture content (9.12%) and
ash content (0.09%) of resulting chitosan were significantly low compared to
chitosan obtained by 100% chemical methods.
2009-01-01T00:00:00ZStudies on a Hyper-haemolytic Compound of Palmyrah Flour (Odiyal)
http://dr.lib.sjp.ac.lk/handle/123456789/1088
Studies on a Hyper-haemolytic Compound of Palmyrah Flour (Odiyal)
Keerthi, A.A.P.; Jansz, E.R.; Ekanayake, S.
Palmyrah (Borassus flabellifer L.) flour (Odiyal) is well known to contain
toxins. A new saponin was isolated from the medium pressure liquid
chromatography (MPLC) fraction between 90% - 100% MeOH:EtOAc
extract and crystallized. On subjecting to Micro-Time of Flight (Micro- TOF)
mass spectrometry it was found to have a molecular weight of 1534, containing
the common steroidal aglycone of odiyal of molecular weight 414, 5 ramhnosyl
and Iglucosyl residues. The first fragment corresponding to MW 228 may be
an uncommon fatty acid derivative. Testing for haemolysis on human red
blood cells (RBC) showed the compound to be hyper-haemolytic with a
haemolytic index 37 fold that of the flabelliferin B (F B) which had been the
previously reported steroidal saponin RBC haemolyser with highest activity
from palmyrah.
2009-01-01T00:00:00ZSpoilage after Cooking of Some Rice Varieties Commonly Consumed in Sri Lanka
http://dr.lib.sjp.ac.lk/handle/123456789/1087
Spoilage after Cooking of Some Rice Varieties Commonly Consumed in Sri Lanka
Waduwawara, S.; Manage, P.M.
Rice once cooked is perishable. In the present study we investigated cooked
rice spoilage of common rice varieties in Sri Lanka. The study was further
extended to compare the effect of clay and aluminium pots on the cooked rice
spoilage and to study the potential to put off cooked rice spoilage in the
traditionally used botanicals rampe (Pandans latifolia), curry leaves (Murraya
koenigii) and turmeric (Curcuma domestica). One Gram positive bacteria
was isolated and identified as Bacillus cereus. In cooked rice, the total count
of Gram positive bacteria increased with time while the total count of Gram
negative bacteria decreased. When inoculated separately to sterilized rice,
the Gram positive bacteria multiplied to a significantly greater number (p <
0.05) than did Gram negative bacteria. The total bacteria count of different
rice varieties was not significantly different from each other. Rumpe and curry
leaves reduced the total Gram positive bacteria count of rice significantly (p
< 0.05) while turmeric did not. The total Gram positive bacteria count of rice
cooked in aluminium pots was significantly lower (p < 0.05) compared to rice
cooked in clay pots.
2009-01-01T00:00:00ZSpecies Richness and Ecological Characterization of Wood Inhabiting Agaric Fungi on Home-garden Logs in Semiurbanized Areas in Colombo Suburbs
http://dr.lib.sjp.ac.lk/handle/123456789/1086
Species Richness and Ecological Characterization of Wood Inhabiting Agaric Fungi on Home-garden Logs in Semiurbanized Areas in Colombo Suburbs
Fernando, K.M.E.P.
Agaric fungi found on fallen logs of different wood species in home gardens
were studied. Species richness and their substrate preferences were
determined by examining the fruit body formation, habit and frequency of
their appearance on the different wood. The effects of temperature, rain and
moisture on fruit body formation were also correlated. During the study period
36 fungal species were identified as wood-inhabiting agaric fungi on 25 homegarden
wood species. Frequency of appearance of fruit bodies was directly
related to the rainfall pattern, but amount of rainfall, temperature and relative
humidity did not show any relationship. The highest species richness was
found on Cocos nusifera, recording 16 agaric species. Artocarpus
heterophyllus, Tectonia grandis, Swietenia. macrophylla and Vitex altisima
showed resistance to macro fungal attack. Schizophyllum commune was
observed on 16 wood species as the commonest agaric species while 17 agaric
species recorded their preference to one particular wood species. Since there
was a high diversity of wood decaying agaric species inhabiting most of the
wood species in this semi-urbanized area, it is possible to cause considerable
damage to valuable wood and wood products in service resulting in economic
loss.
2009-01-01T00:00:00Z