Production of biodiesel over ZnO-TiO2 bifunctional oxide catalyst supported on natural zeolite

In this paper, biodiesel is produced from palm oil and methanol via the transesterification process over the heterogeneous catalyst. The metal oxide ZnO-TiO2 was impregnated into natural zeolite over the dry impregnation method. The ZnO-TiO2/NZ catalyst was prepared over the dry impregnation method. The catalysts' characteristic was characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The biodiesel was analyzed by Fourier-Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS). The results showed a functional group of methyl ester (C=O, carbonyl group) at 1744.51 cm-1. The components of methyl ester such as hexadecanoic acid methyl ester (C17), cis-9-heptadecanoic acid methyl ester (C18), oleic acid methyl ester (C19), are present in the biodiesel with the percent area of 0.05%, 0.08%, 0.63%, 7.06%, 16.3%, respectively, over ZnO-TiO2/NZ catalyst with a metal ratio of 1:1. This catalyst was successful in the transesterification of palm oil to produce biodiesel.

Cultivation of Chlorella sp. in broiler chicken waste media and its metabolite profile by GC-MS analysis

Broiler Chicken Waste (LTAB) contained Nitrogen, Phosphorus and Potassium. LTAB can be used as an alternative medium for the cultivation of Chlorella sp. In this study, Chlorella sp. was cultured in LTAB at various concentrations (2,4,6,8, and 10%). Growth of Chlorella sp. was measured based on optical density values at a wavelength of 680 nm. Biomass was extracted using chloroform. The extract obtained was identified using Gas Chromatography-Mass Spectroscopy (GC-MS). LTAB 2% was the best medium for the growth of Chlorella sp. (amongst other concentrations). The highest growth rate was on the 10th day. Based on the results of KG-MS, chloroform extract of Chlorella sp. cultured on LTAB 2% contained oleic acid, methyl ester and gamma-sitosterol.Keywords: Chlorella sp, Medium, Waste, chromatographyABSTRAKKultivasi Chlorella sp. pada media limbah ayam broiler dan profil metabolitnya dengan analisis GC-MSLimbah Ternak Ayam Broiler (LTAB) mengandung Nitrogen, Fosfor dan Kalium. LTAB dapat dijadikan media alternatif untuk kultivasi Chlorella sp. Pada penelitian ini, Chlorella sp. dikultur pada LTAB pada berbagai konsentrasi (2,4,6,8, dan 10%). Pertumbuhan Chlorella sp. diukur berdasarkan nilai optical density pada panjang gelombang 680 nm. Biomassa diekstrak menggunakan kloroform. Ekstrak yang diperoleh diidentifikasi meggunakan Gas Chromatography-Mass Spectroscopy (GC-MS). LTAB 2% merupakan media terbaik untuk pertumbuhan Chlorella sp. (diantara konsentrasi lainnya). Laju pertumbuhan tertinggi yaitu pada hari ke-10. Berdasarkan hasil KG-MS, ekstrak kloroform Chlorella sp. yang dikultur pada LTAB 2% mengandung senyawa asam oleat, metil ester dan gamma-sitosterol.Kata kunci: Chlorella sp., media, limbah, Kromatografi

The Evaluation of Dark Chocolate-Elicited Emotions and Their Relation with Physico Chemical Attributes of Chocolate

The aim of this study was to evaluate the effect of different origin (Venezuela, Ghana, Peru) dark chocolates on emotions induced for consumers, and to analyse the relationships among overall acceptability (OA), emotions, and physicochemical attributes of the chocolate (fatty acids (FAs) and volatile compounds (VC)). Chocolate-elicited emotions were measured with FaceReader 8 software, scaling 10 emotion patterns (neutral, happy, sad, angry, surprised, scared, disgusted, contempt, valence, arousal). The OA was carried out by using a 10-point hedonic scale, ranging from 1 (extremely dislike) to 10 (extremely like). The obtained results showed that, among all chocolate-elicited emotions, the intensity of “happy” was the highest. In most cases, the influence of the different origin chocolate on the emotions induced for consumers was significant (except on emotions “neutral”, “scared”, and “disgusted”). Significant differences between the tested chocolates OA were not found. The origin of chocolate had a significant effect on most of the identified VC and the content of the main FAs (methyl palmitate, methyl stearate, cis,trans-9- oleic acid methyl ester, and methyl linoleate). Significant correlations between chocolate-elicited emotions and separate FAs and VC were found. Finally, this study showed that the origin of dark chocolate significantly influenced most of chocolate-elicited emotions and physicochemical attributes of chocolate, while separate FAs or VC can be used as chocolate quality indicators related to the chocolate OA, as well as chocolate-elicited emotions.

Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites

One way to take advantage from out of specification biodiesel and waste from biodiesel tank bottom drainage is to co-process them in a fluidized catalytic cracking (FCC) unit. The present work deals with the cracking of oleic acid methyl ester (OAME) as a biodiesel model, under conditions close to that of FCC process over ZSM-5 and Y zeolites, either in protonated or sodium forms, for the production of deoxygenated compounds. Catalytic fast cracking of OAME pre-adsorbed on the catalyst surface was performed, with a catalyst:OAME mass ratio of 10:1 in a micro-pyrolysis system at 650°C, coupled to a GC/MS for on line analysis of the products. Results show that the cracking of OAME without a catalyst favored the formation of linear alkenes and polyenes. Fast cracking of OAME over HZSM-5 and HY acidic zeolites led to the production of aromatics, due to hydrogen transfer. Cracking over NaY and HY zeolites produced remarkable amounts of ramified saturated hydrocarbons. The formation of alkylated hydrocarbons was not significant over ZSM-5 zeolite probably due to a small pore size of this zeolite. NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). Low acidic zeolites favored the production of non-aromatic hydrocarbons. Product distribution was affected by catalyst shape selectivity and acidity. These results show that residues from the biodiesel chain can be directly co-processed in FCC units to obtain high value hydrocarbons, mainly in the jet fuel and gasoline ranges.

Fatty Acid Profile of Lipid Fractions of Mangalitza (Sus scrofa domesticus) from Northern Romania: A GC-MS-PCA Approach

Mangalitza pig (Sus scrofa domesticus) becomes more popular in European countries. The goal of this study was to evaluate the fatty acid profile of the raw and thermally processed Mangalitza hard fat from Northern Romania. For the first time, the gas chromatography-mass spectrometry-Principal component analysis technique (GC-MS-PCA)—was applied to evaluate the dissimilarity of Mangalitza lipid fractions. Three specific layers of the hard fat of Mangalitza from Northern Romania were subjected to thermal treatment at 130 °C for 30 min. Derivatized samples were analyzed by GC-MS. The highest relative content was obtained for oleic acid (methyl ester) in all hard fat layers (36.1–42.4%), while palmitic acid was found at a half (21.3–24.1%). Vaccenic or elaidic acids (trans) were found at important concentrations of 0.3–4.1% and confirmed by Fourier-transform infrared spectroscopy. These concentrations are consistently higher in thermally processed top and middle lipid layers, even at double values. The GC-MS-PCA coupled technique allows us to classify the unprocessed and processed Mangalitza hard fat specific layers, especially through the relative concentrations of vaccenic/elaidic, palmitic, and stearic acids. Further studies are needed in order to evaluate the level of degradation of various animal fats by the GC-MS-PCA technique.

Characterization and identification of compounds in neem (Azadirachta indica) seed oil

The seed oil of Azadrichta indica was obtained by Soxhlet extraction method. The maximum oil yield using petroleum ether was found 18.4% at a temperature of 70oC and a minimum yield of 13.5% at 30oC while at the same operating condition ethyl acetate and methanol resulted a maximum yield of 17.0% and 16.5% and a minimum of 12.0% and 13.0% respectively. So petroleum ether is a good solvent to afford high yield in this work. The oil was analyzed by GC-MS and result in the identification of the compounds (palmitoleic acid methyl ester, palmitic acid methyl ester, linoleic acid methyl ester, oleic acid methyl ester, stearic acid methyl ester, etc.) was obtained. In the present study various physical and chemical characteristics have been also studied. The results also indicated that the oil extracted from neem seed is the most acidic and non edible.

Produksi Biodiesel dari Dedak Padi dengan Metode In-Situ Dua Tahap Menggunakan Katalis Asam Sulfat dan CaO/Hydrotalcite

In this study, biodiesel is made from rice bran vegetable oil. Biodiesel production was carried out by the in-situ method using two-sides using sulfuric acid catalysts and CaO/hydrotalcite. The solvent used was methanol as an oil component in the material and a reactant in the formation of FAME and n-hexane as a solvent to increase the yield of rice bran oil extraction. CaO/hydrotalcite to the yield of biodiesel produced and composition of biodiesel at the highest yield. As much as 50 grams of rice bran was put into a three-neck flask, then 50 ml of n-hexane were added. Next, 1 ml mixture of a sulfuric acid catalyst and 250 ml of methanol were added. Then, the mixture was reacted at 65º. Add stirring to 600 rpm for 90 minutes. Reheating after 90 minutes and a sample of 2.5 grams was taken for FFA testing. Next, the CaO/hydrotalcite catalyst in 10 ml of methanol with a mass variation of 1; 1,5; and 2 grams are added to the reaction flask. The mixture was reacted again at a temperature of 65 ºSuitably stirrings 600 rpm for 90 minutes. Based on the BET test results, the CaO/hydrotalcite catalyst surface area was 200.13 m2/g. The best results obtained on CaO/hydrotalcite catalysts were 2 grams with a biodiesel yield of 9.56%. In the highest biodiesel yield, the FAME component is preferred over the oleic acid methyl ester composition with an area of 35.09% at a retention time of 19.14 min.