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Biofuels

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...

Bioequivalence: Overview

Bioequivalence: Overview

Pharmaceutical equivalents, by definition, are drug products with the same active ingredient in the same quantities, encapsulated in identical dosage forms, and intended for the same administration routes. These pharmaceutical equivalents are deemed bioequivalent if the bioavailability of the active entity in the drug preparations is similar. Moreover, pharmaceutical equivalents demonstrating bioequivalence are also regarded as therapeutically equivalent. This means that when used as directed,...

Microbial Bioremediation of Hydrocarbons

Microbial Bioremediation of Hydrocarbons

Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...

Bioequivalence studies: Biowaivers

Bioequivalence studies: Biowaivers

In certain scenarios, in vitro dissolution tests can replace in vivo bioequivalence studies. This is particularly true when a drug product, though available in varying strengths, maintains proportional similarity in its active and inactive ingredients. In such cases, the need for in vivo bioequivalence studies for lower strength variants may be waived, provided dissolution tests and in vivo studies on the highest strength yield satisfactory results.Bioequivalence can be indicated through...

Drug Products: Biologics, Biosimilars and Interchangeables

Drug Products: Biologics, Biosimilars and Interchangeables

Biologics, derived from living sources such as humans, animals, or microorganisms, represent a significant category of pharmaceuticals. These complex molecules, developed through advanced biotechnological methods or purified from natural sources, include essential medical treatments like insulin and growth hormones. The complexity of biologics arises from their large molecular structures and the intricate processes required for their production, making them distinct from conventional...

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Related Experiment Video

Updated: Jun 25, 2026

Ultrasonic-Assisted Preparation of Biodiesel Products from Vegetable Oils

Ultrasonic-Assisted Preparation of Biodiesel Products from Vegetable Oils

Published on: April 19, 2024

Biodiesel surrogates: achieving performance demands.

Rakesh Sarin¹, Ravindra Kumar, Bhawana Srivastav

¹Indian Oil Corporation Ltd., R&D Centre, Faridabad 121 007, India. sarinr@yahoo.com

Bioresource Technology

|February 27, 2009

Summary

New beta-branched fatty acid esters offer superior biodiesel properties. These surrogate molecules show enhanced oxidative stability and improved low-temperature performance, meeting international standards.

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Area of Science:

Chemical Engineering
Materials Science
Organic Chemistry

Background:

Biodiesel production faces challenges with oxidative stability and low-temperature properties.
Fatty acid methyl esters (FAMEs) are common but have limitations.
Surrogate molecules can provide insights into structure-activity relationships and performance improvements.

Purpose of the Study:

To synthesize novel beta-branched fatty acid esters to enhance biodiesel properties.
To evaluate the oxidative stability and low-temperature performance of these synthesized esters.
To assess their suitability as diesel or biodiesel blends.

Main Methods:

Synthesis of beta-branched fatty acid esters from beta-branched alcohols.
Oxidation of beta-branched alcohols to corresponding beta-branched fatty acids.
Esterification of acids to form methyl, ethyl, isopropyl, and n-butyl esters.
Characterization of physico-chemical properties including oxidative stability (Rancimat), cloud point, pour point, CFPP, viscosity, and cetane number.

Main Results:

Synthesized esters exhibited excellent oxidative stability with Rancimat induction periods > 24 hours.
Exceptional low-temperature properties were observed: cloud point < -36°C, pour point < -42°C, and CFPP < -21°C.
Viscosity ranged from 4.2-4.6 cSt at 40°C, meeting diesel and biodiesel standards.
Cetane numbers were high (62-69), surpassing conventional diesel and biodiesel.
5% and 10% blends with diesel met Indian diesel standards.

Conclusions:

Beta-branched fatty acid esters represent a promising class of compounds for advanced biofuels.
These esters significantly improve upon the oxidative and low-temperature characteristics of conventional biodiesel.
The synthesized esters meet key international and Indian standards for diesel and biodiesel applications.