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Energy-requiring Steps of Glycolysis

Energy-requiring Steps of Glycolysis

Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...

Glycolysis

Glycolysis

Glycolysis, the Embden-Meyerhof pathway, is a central metabolic pathway involved in glucose catabolism. It is highly conserved across most organisms, reflecting its fundamental role in cellular energy production. This process occurs in the cytoplasm and can function both in the presence and absence of oxygen, making it versatile for various organisms and environmental conditions.Stages of GlycolysisGlycolysis is a ten-step pathway that converts glucose into pyruvate, generating a net gain of...

Glycolysis: Preparatory Phase

Glycolysis: Preparatory Phase

In cellular metabolism (the complete breakdown of glucose to extract energy), glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...

Glycolysis: Pay-off Phase

Glycolysis: Pay-off Phase

So far, glycolysis has cost the cell two ATP molecules and produced two small, three-carbon sugar molecules. These molecules will proceed through the second half of the pathway, and sufficient energy will be extracted to pay back the two ATP molecules used as an initial investment and produce a profit for the cell of two additional ATP molecules and two even higher-energy NADH molecules.
Step 1 - 5: Glycolysis Preparatory Phase
The first phase of glycolysis has 5 steps where the glucose is...

Outcomes of Glycolysis

Outcomes of Glycolysis

Nearly all the energy used by cells comes from the bonds that make up complex organic compounds. These organic compounds are broken down into simpler molecules, such as glucose. As a result, cells extract energy from glucose over many chemical reactions—a process called cellular respiration.
Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen). In the presence of oxygen, cellular respiration starts with glycolysis and continues with pyruvate oxidation, the...

What is Glycolysis?

What is Glycolysis?

Overview
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...

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Related Experiment Video

Updated: May 12, 2026

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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A novel facile two-step method for producing glucose from cellulose.

Jinping Ni¹, Hailiang Wang, Yinying Chen

¹Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China.

Bioresource Technology

|April 16, 2013

Summary

This study introduces a two-step acid hydrolysis method to convert cellulose into glucose efficiently. Mild conditions and microwave assistance significantly improve glucose yield and selectivity, offering a promising biomass conversion process.

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Area of Science:

Biomass Conversion and Bioenergy
Green Chemistry
Carbohydrate Chemistry

Background:

Cellulose hydrolysis is crucial for biofuel and biochemical production.
The recalcitrance of cellulose poses challenges for efficient depolymerization.
Mild and selective hydrolysis methods are needed to overcome these limitations.

Purpose of the Study:

To establish an effective two-step acid-catalyzed hydrolysis methodology for cellulose to glucose conversion.
To improve glucose yield and selectivity under mild reaction conditions.
To investigate the impact of microwave assistance on the hydrolysis process.

Main Methods:

A two-step acid hydrolysis process involving initial depolymerization of microcrystalline cellulose in phosphoric acid.
Precipitation of cellulose oligomers followed by hydrolysis with dilute sulfuric acid.
Application of microwave irradiation in the second hydrolysis step to enhance efficiency.

Main Results:

The two-step hydrolysis achieved 87.7% total reducing sugars and 57.8% glucose yield.
Microwave-assisted hydrolysis in the second step improved glucose yield to 73.3% and selectivity to 80.1% within 5 minutes.
Reduced cellulose crystallinity and increased depolymerization degree contributed to enhanced hydrolysis reactivity.

Conclusions:

The developed two-step acid hydrolysis is an effective method for producing glucose from cellulose.
Microwave assistance significantly boosts glucose yield and selectivity, reducing reaction time.
This process offers a promising route for efficient biomass valorization.