Analysis of the pour point of coconut oil as a lubricant base stock using differential scanning calorimetry

10.1002/ls.69 ◽  
2008 ◽  
Vol 21 (1) ◽  
pp. 13-26 ◽  
Author(s):  
G. Ajithkumar ◽  
N. H. Jayadas ◽  
M. Bhasi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Pour Point ◽  
Coconut Oil ◽  
Base Stock ◽  
Scanning Calorimetry ◽  
Lubricant Base Stock

Evaluation of physicochemical and tribological properties of chaulmoogra (Hydnocarpus wightianus) oil as green lubricant base stock

2020 ◽  
pp. 135065011989952 ◽  
Author(s):  
S Salaji ◽  
NH Jayadas
Keyword(s):  
Fatty Acids ◽  
Vegetable Oils ◽  
Tribological Properties ◽  
Pour Point ◽  
Edible Oil ◽  
Base Stock ◽  
Resonance Spectroscopy ◽  
Natural Oils ◽  
Lubricant Base Stock ◽  
Cyclic Fatty Acids

Due to environmental concerns, natural oils are increasingly being used as an alternative to mineral oil-based products such as lubricants. However, the use of edible oil for industrial application adversely affects their availability for edible purposes. Chaulmoogra oil is a non-edible oil obtained from the seeds of chaulmoogra tree that grows in wastelands. The fatty acid constituents of vegetable oils determine their properties. Presence of long-chain cyclic fatty acids like chaulmoogric acid, hydnocarpic acid and gorlic acid distinguishes chaulmoogra oil from other oils. Research on how cyclic fatty acids influence the properties of vegetable oils and affect their efficacy as base oils for lubricants is scarce in the literature. This paper presents a preliminary evaluation of the physicochemical, viscometric, oxidative and tribological properties of chaulmoogra oil as a lubricant base stock. Gas chromatography–mass spectroscopy, Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy methods were used for structure elucidation. The viscometric analysis was conducted by using Brookfield viscometer. The tribological performance was evaluated by a four-ball apparatus as per ASTM D4172-94. Thermal and oxidative stabilities were evaluated by thermogravimetric/differential thermal analysis in nitrogen and oxygen environments. Pour point was assessed by ASTM D97 method and differential scanning calorimetry. Chaulmoogra oil has a viscosity of 9.2 cSt at 100 ℃ and a viscosity index of 166. Though the coefficient of friction was better than a commercial lubricant of similar viscosity range (SAE 20W40), the wear scar diameter was comparatively higher. Addition of antiwear additive zinc dialkyl dithiophosphate showed considerable improvement in the wear performance of chaulmoogra oil. Chaulmoogra oil showed a high pour point value around 15 ℃ which needs to be improved by appropriate pour point depressants. Environmental advantage, coupled with non-edible nature of chaulmoogra oil, makes it an excellent base stock for lubricants.

scholarly journals FORMULATION AND EVALUATION OF CREAMS CONTAINING CELECOXIB INCLUSIONS FOR TREATING PSORIATIC ARTHRITIS

2020 ◽  
pp. 41-45
Author(s):  
ROOPA RANI N ◽  
SUDHARSHAN B ◽  
SHIVA PULLA REDDY G ◽  
PADMINI IRIVENTI
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Psoriatic Arthritis ◽  
Cocoa Butter ◽  
Stearic Acid ◽  
Coconut Oil ◽  
Scanning Calorimetry ◽  
Inflammatory Drug ◽  
Gum Acacia ◽  
Evaluation Parameters

Objective: The main objective of the present work was to prepare and evaluate creams of celecoxib inclusions which are nonsteroidal anti-inflammatory drug to treat psoriatic arthritis. Methods: Celecoxib inclusions were prepared using β-cyclodextrin to increase the solubility. These inclusions were incorporated in creams. Cocoa butter, triethanolamine, stearic acid, methylparaben, gum acacia, and coconut oil were used in cream preparation. Fourier transform infrared and differential scanning calorimetry studies were carried out for pure celecoxib and inclusions. Viscosity, pH, homogeneity, and type of emulsion under dye test were evaluation parameters done for creams. Results: All the results obtained were within the limits and confirmed increased solubility of celecoxib inclusions. Conclusion: From the results obtained, increase in solubility of celecoxib drug was confirmed by forming inclusions using β-CD as polymer.

scholarly journals Characterization of Thermal Behaviour and Fatty Acid Profile of Coconut Based Chocolate Novelties

2020 ◽  
Author(s):  
V. Divya ◽  
D. Baskaran
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fatty Acid ◽  
Cocoa Butter ◽  
Fatty Acid Profile ◽  
Coconut Oil ◽  
Coconut Milk ◽  
Consumer Acceptance ◽  
Scanning Calorimetry ◽  
Coconut Cream

A study was carried out to produce chocolates from coconut variants viz, coconut oil, coconut cream and coconut milk as a substitute for cocoa butter. The chocolate prepared with 40% cocoa butter was taken as control. Cocoa butter substituted at the levels of 10%, 20% and 30 % by coconut oil, coconut cream and coconut milk respectively were optimized based on the consumer acceptance. The fatty acid profile of the developed chocolate novelties were analysed using GC-MS and the lauric acid content was elevated to 1.92 %, 1.04 % and 1.17% in coconut oil, coconut cream and coconut milk chocolates respectively from 0.02 % in control. The thermal behavior of the developed chocolate novelties were analyzed by using Differential Scanning Calorimetry which exhibited harmonious distinct endothermic transitions between 28oC and 53oC. The developed chocolate novelties exhibited stable melting ranges in comparison with control.

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

Optimasi Proses Pembuatan dan Karakterisasi Fisik Niosom Sinkonin

2019 ◽  
Vol 16 (2) ◽  
pp. 178
Author(s):  
Hariyanti Hariyanti ◽  
Sophi Damayanti ◽  
Sasanti Tarini
Keyword(s):  
Differential Scanning Calorimetry ◽  
Particle Size ◽  
Hair Follicle ◽  
Scanning Calorimetry ◽  
Span 60

Sinkonin praktis tidak larut dalam air, sedikit larut dalam kloroform dan alkohol. Hal ini berdampak pada rendahnya penetrasi transfollicular sinkonin, karena hanya bahan aktif hidrofilik yang mampu melewati hair follicle. Dengan demikian dibutuhkan satu sistem penghantaran yang mampu menurunkan hidrofobisitas sinkonin untuk meningkatkan penetrasi sinkonin ke follicle. Niosom merupakan vesikel ampifilik dengan struktur lapisan rangkap yang terbentuk dari hidrasi kombinasi surfaktan nonionik dan kolesterol yang mampu menurunkan hidrofobisitas sinkonin. Penelitian ini bertujuan untuk menentukan proses pembuatan niosom sinkonin yang optimum. Pembuatan niosom sinkonin diawali dengan menentukan temperatur gelasi (Tg) dari span 60 dengan Differential Scanning Calorimetry (DSC), kemudian dilanjutkan dengan optimasi proses meliputi: optimasi kecepatan rotavapor pembentukan film lapis tipis, temperatur hidrasi, kecepatan rotavapor hidrasi, waktu hidrasi, dan waktu sonikasi. Karakteristik vesikel niosom yang optimal meliputi: ukuran partikel dan indeks polidispersitas dengan menggunakan Particle Size Analized (PSA) serta efisiensi penjeratan sinkonin dengan menggunakan KCKT. Temperatur gelasi (Tg) span 60 45±2 oC, kecepatan rotavapor pembentukan film lapis tipis niosom 210 rpm, temperatur hidrasi 55±2 oC, kecepatan rotavapor hidrasi 210 rpm, waktu hidrasi 20 menit, waktu sonikasi suspensi niosom 1 menit. Ukuran vesikel yang diperoleh adalah 100–200 nm, indeks polidispersitas 0,2–0,4 dan efisiensi penjeratan niosom sinkonin 84,49±0,0025%. Proses pembuatan niosom sinkonin memiliki pengaruh besar terhadap hasil ukuran vesikel dan efisiensi penjeratan niosom sinkonin.

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