scholarly journals FTIR and Moisture Absorption of Yam Bean Starch Biocomposites with Yam Bean (Pachyrhizus erosus) Bagasse Fibers as Reinforcement

2018 ◽  
Vol 19 (2) ◽  
pp. 93
Author(s):  
Melbi Mahardika ◽  
Hairul Abral ◽  
Anwar Kasim ◽  
Syukri Arief ◽  
Mochamad Asrofi
Keyword(s):  
Relative Humidity ◽  
Moisture Absorption ◽  
Dry Weight ◽  
Absorption Test ◽  
Solution Casting ◽  
Fabrication Method ◽  
Pachyrhizus Erosus

Biocomposites from yam bean starch with yam bean bagasse (YBB) fibers as reinforcement has been successfully fabricated. The fabrication method was solution casting. YBB was variated for 1, 2, 3 and 4wt% (from dry weight starch basis). 2 mL glycerol was used as a plasticizer. The relative humidity (RH) condition in moisture testing was 99%. The result shows that the addition YBB able to decreased moisture absorption of starch film. The lowest moisture absorption was in biocomposites with 4wt% YBB. The moisture absorption test was supported byfourier transform infrared (FTIR) data.Keywords: Biocomposite, yam bean, yam bean bagasse, moisture, FTIR

Slow rehydration improves the recovery of dried bacterial populations

1992 ◽  
Vol 38 (6) ◽  
pp. 520-525 ◽  
Author(s):  
J. W. Kosanke ◽  
R. M. Osburn ◽  
G. I. Shuppe ◽  
R. S. Smith
Keyword(s):  
Relative Humidity ◽  
Rhizobium Leguminosarum ◽  
Moisture Absorption ◽  
Rhizobium Meliloti ◽  
Bacterial Populations ◽  
Bulk Powder ◽  
Alfalfa Seed ◽  
Powder Samples ◽  
Cellular Stresses ◽  
Rhizobium Leguminosarum Biovar Trifolii

Slow rehydration of bacteria from dried inoculant formulations provided higher viable counts than did rapid rehydration. Estimates were higher when clay and peat powder formulations of Rhizobium meliloti, Rhizobium leguminosarum biovar trifolii, and Pseudomonas putida, with water activities between 0.280 and 0.650, were slowly rehydrated to water activities of approximately 0.992 before continuing the dilution plating sequence. Rhizobium meliloti populations averaged 6.8 × 108 cfu/g and 1328 cfu/alfalfa seed greater when slowly rehydrated from bulk powder and preinoculated seeds, respectively. Bulk powder samples were slowly rehydrated to 0.992 water activity by the gradual addition of diluent, followed by a 10-min period for moisture equilibration. Preinoculated seed samples were placed in an environmental chamber at 24 °C with relative humidity greater than 80% for 1 h to allow moisture absorption. "Upshock," osmotic cellular stresses that occur during rehydration, was reduced when dried microbial formulations were slowly rehydrated and equilibrated before becoming fully hydrated in the dilution plating sequence. These procedures may also be applicable when estimating total viable bacterial populations from dried soil or other dry formulations. Key words: rehydration procedure, microbial rehydration, desiccation, Rhizobium, Pseudomonas.

Effect Of Moisture On The Physical Properties Of Polyimide Films

1991 ◽  
Vol 227 ◽  
Author(s):  
Rajeevi Subramanian ◽  
Michael T. Pottiger ◽  
Jacqueline H. Morris ◽  
Joseph P. Curilla
Keyword(s):  
Dielectric Constant ◽  
Steady State ◽  
Electrical Properties ◽  
Relative Humidity ◽  
Quartz Crystal ◽  
Moisture Absorption ◽  
Relative Dielectric Constant ◽  
Moisture Uptake ◽  
Polyimide Films ◽  
Effect Of Moisture

ABSTRACTMoisture absorption and its effect on electrical properties were measured for several polyimides. A Quartz Crystal Microbalance (QCM) was used to investigate the moisture absorption in BPDA/PPD, PMDA/ODA, and BTDA//ODA/MPD polyimides. The steady-state moisture uptake in polyimides as a function of relative humidity (RH) was determined by exposing film samples to successively higher RH values ranging from 10 to 85% at 25°C. The isothermal moisture absorption as a function of percent RH was found to be nearly linear for all of the polyimides studied. The effect of moisture on the electrical properties of a BPDA/PPD polyimide was also investigated. The relative dielectric constant at 25 °C was found to be a linear function of the moisture absorbed.

Experimental Study on Hygroscopicity of Rapeseed (Brassica Napus)

2012 ◽  
Vol 479-481 ◽  
pp. 2275-2278
Author(s):  
Ming Jin Yang ◽  
Wu Ming Xu ◽  
Tian Tang ◽  
Ling Yang ◽  
Feng Liu
Keyword(s):  
Experimental Study ◽  
Brassica Napus ◽  
Relative Humidity ◽  
Moisture Absorption ◽  
Early Period ◽  
Critical Relative Humidity ◽  
Temperature And Humidity ◽  
Higher Temperature

The hygroscopicity property of the rapeseed at different temperature and humidity was experimental studied in this paper. Tested results show that: the moisture absorption rates increase with the increase of relative humidity at the early period of absorption, and higher temperature leads to earlier reach of moisture equilibrium; the critical relative humidity(CRH) increases with the increase of temperature; the optional relative humidity for safety storage of rapeseed should be controlled less than 60%.

A novel accelerated moisture absorption test and characterization

2009 ◽  
Vol 40 (9) ◽  
pp. 1501-1505 ◽  
Author(s):  
Siva P. Pilli ◽  
Kevin L. Simmons ◽  
James D. Holbery ◽  
Vaithiyalingam Shutthanandan ◽  
Patrick B. Stickler ◽  
...  
Keyword(s):  
Moisture Absorption ◽  
Absorption Test

scholarly journals PHYTOSTEROL CONTENT IN BENGKOANG (Pachyrhizus erosus)

2012 ◽  
Vol 13 (2) ◽  
pp. 47-54
Author(s):  
Endang Lukitaningsih
Keyword(s):  
Structure Elucidation ◽  
Petroleum Ether Extract ◽  
Dry Weight ◽  
Lemon Juice ◽  
Raw Material ◽  
Ether Extract ◽  
Nmr Spectrum ◽  
Phytosterol Content ◽  
Pachyrhizus Erosus ◽  
Spectrum Data

Bengkoang has long been used by ancestors as a raw material for cosmetics. In Indonesia, it is usually eaten raw, sometimes with salt, lemon juice and powdered chili. However, scientific evidences that support the use of bengkoang have not been widely published. Phytosterols from the bengkoang root have been isolated and identified based on their NMR spectrum data and mass spectrum. The result of the structure elucidation informed that ß-sitosterol and stigmasterol are major components of phytosterol in bengkoang root. Phytosterol content was about 0.02% of dry weight bengkoang or 2.76 % in petroleum ether extract of bengkoang, with a ratio of ß-sitosterol and stigmasterol (65:35). Therefore, bengkoang can be further exploited as a raw material of phytosterol supplement.

Moisture Absorption Behavior and Morphology of Thermoplastic Starch via Ascorbic Acid Hydrolysis Technique

2017 ◽  
Vol 264 ◽  
pp. 148-151
Author(s):  
Amirah Hulwani Mohd Zain ◽  
Mohamad Kahar Ab Wahab
Keyword(s):  
Ascorbic Acid ◽  
Moisture Absorption ◽  
Starch Granule ◽  
Thermoplastic Starch ◽  
Continuous Phase ◽  
Ester Bond ◽  
Absorption Test ◽  
Ftir Analysis ◽  
Mechanical Process ◽  
Scanning Electron

The effect of modified thermoplastic starch (TPS) with organic acid was studied. In presence of ascorbic acid (AATPS) and glycerol (GTPS) along with mechanical process, a native starch granule was transform into a continuous phase as shown by scanning electron microscopy (SEM). Reaction of ascorbic acid (AA) with starch induced to the formation of the ester bond, which improved moisture resistivity of TPS was proven by the determination degree of substitution (DS) and moisture absorption test. The formation of ester bond was identified by using FTIR analysis. The DS values were ranging from 0 to 0.052, respectively, with the increase of AA content.

Moisture Absorption and Diffusion Characterization of Molding Compound

2005 ◽  
Vol 127 (4) ◽  
pp. 460-465 ◽  
Author(s):  
Xu Chen ◽  
Shufeng Zhao ◽  
Linda Zhai
Keyword(s):  
Relative Humidity ◽  
Moisture Absorption ◽  
Saturated Vapor ◽  
Ambient Air ◽  
Second Phase ◽  
Fick’S Law ◽  
Moisture Concentration ◽  
Molding Compound ◽  
Fick's Law ◽  
Temperature And Humidity

The moisture absorption experiments of two kinds of molding compound are conducted. The diffusion at low temperature and humidity observes the Fick’s Law, but it does not strictly obey at higher temperature and humidity. The phenomena can be attributed to the occurrence of the second phase, and the Fick’s Law can be modified by diffusion coefficient varying with the moisture concentration. The predicted value by the modified Fick’s Law agrees with the test data. At certain temperature, the saturated moisture content of molding compound is proportional to the relative humidity, and the proportional factor is the product of solubility and saturated vapor pressure. The solubility is a physical characteristic, which has no relations with the relative humidity of ambient air.

An Experiment Study on the Moisture Absorption and Desorption Characteristic of Humidity-Controlled Composite Building Blocks in Greenhouse

2011 ◽  
Vol 335-336 ◽  
pp. 240-243
Author(s):  
Feng Lan Wei ◽  
Chun Long Li ◽  
E Liu ◽  
Cai Bei Zhang
Keyword(s):  
Relative Humidity ◽  
Power Consumption ◽  
High Power ◽  
Moisture Absorption ◽  
Building Blocks ◽  
Absorption Characteristic ◽  
Experiment Study ◽  
High Power Consumption ◽  
Equilibrium Content ◽  
Application Prospects

The moisture absorption characteristic of the humidity-controlled materials at different relative humidity was studied by experiment and the moisture equilibrium content under different humidity condition was obtained. At the same time, the humidity-controlled composite building blocks in greenhouse were successfully developed. The experiment of the humidity-controlled composite building blocks shows that the humidity-controlled composite building blocks can realize the humidity control without the high power consumption, operation inconvenience or polluted the environment etc. compared with the traditional dehumidification method. The humidity-controlled composite building blocks in greenhouse have the very good application prospects.

Variations in morphine, codeine and thebaine in the capsules of Papaver somniferum L. during maturation

1980 ◽  
Vol 31 (2) ◽  
pp. 313 ◽  
Author(s):  
PJ Hofman ◽  
RC Menary
Keyword(s):  
Relative Humidity ◽  
Fungal Growth ◽  
Dry Weight ◽  
Papaver Somniferum ◽  
Rapid Decrease ◽  
Field Conditions ◽  
Rapid Loss ◽  
Full Bloom ◽  
High Rainfall ◽  
Morphine Concentration

During the 1978-79 season, changes in the straw from a commercial and glasshouse-grown crop of Papaver somniferum L. were monitored. The percentage morphine and codeine reached their maximum values of 1.57 % and 0.10% respectively 5 weeks after full bloom under field conditions. Their contents changed little until the 11th week; thereafter losses of 35% and 32% in the morphine and codeine concentrations occurred over a 2 week period. This coincided with comparatively high rainfall and relative humidity, which permitted heavy fungal growth and a 28% decrease in the dry weight per sample of straw. There was a rapid decrease in thebaine concentration during the second week after full bloom, followed by a more gradual decrease up till 13 weeks after full bloom. A total loss of 58 % was recorded over the 13 week period, but there was no rapid loss during the 11-13 week period. Under glasshouse conditions morphine and codeine concentrations increased until the eighth and seventh weeks after full bloom respectively. The morphine concentration after this period showed little change, while that of codeine varied slightly. Their maximum detected concentrations were 1 .89 % and 0.16 % respectively. The thebaine concentration decreased rapidly during the first 5 weeks after full bloom from its highest detected value of 0.59% at week 2.

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