How Protein Analysis Performed by 9000 NIR at BASTAK ?

Introduction

Protein analysis is one of the most critical quality parameters in cereals, flour, and cereal-based products, as protein content directly affects nutritional value, processing behavior, and final product quality. Conventional protein determination methods, although reliable, are often time-consuming, labor-intensive, and require chemical reagents. In response to the increasing demand for rapid, accurate, and environmentally friendly analytical techniques, Near Infrared (NIR) spectroscopy has become a widely accepted alternative in food quality control laboratories.

BASTAK Instruments 9000 NIR Analyzer is extensively used in leading quality control laboratories worldwide for rapid determination of protein and other quality parameters in wheat and flour samples, from raw material intake to final product control.

Working Principle of NIR Spectroscopy

Near Infrared (NIR) spectroscopy is based on the absorption of electromagnetic radiation in the wavelength range of 780–2500 nm (corresponding to 4000–13,000 cm⁻¹). When NIR radiation interacts with a sample, specific chemical bonds absorb energy and undergo vibrational transitions.

In organic molecules, NIR absorption bands mainly arise from overtones and combination vibrations of fundamental molecular bonds such as –CH, –NH, and –OH. These absorption bands often overlap, creating complex spectra that reflect the overall chemical composition of the sample. By applying multivariate calibration models, these spectral patterns can be correlated with reference chemical values such as protein content.

Spectroscopic analysis, in general, relies on measuring and interpreting electromagnetic radiation absorbed or emitted as a result of molecular rotation, vibration, and electronic excitation. Among spectroscopic techniques used in food analysis, infrared spectroscopy and particularly NIR spectroscopy stands out due to its speed, non-destructive nature, and minimal sample preparation requirements.

BASTAK 9000 NIR Technology

BASTAK  9000 NIR Instruments operate on advanced near-infrared transformation principles and are designed for routine quality control applications. Thanks to BASTAK’s superior and robust NIR technology, the DA 9000 enables simultaneous and rapid measurement of multiple quality parameters within seconds.

Using this system, the following parameters can be determined in red bread wheat, white bread wheat, durum wheat, and flour samples:

• Protein content
• Gluten content
• Moisture content
• Ash content
• Zeleny sedimentation value

 9000 NIR provides reliable results without the use of chemicals or reagents, making it an environmentally friendly (“green”) analytical solution suitable for high-throughput industrial laboratories.

Protein and Gluten Determination: Reference Methods

For calibration and validation purposes, conventional reference methods are still used. Total protein content is commonly determined by the Kjeldahl method in accordance with ISO 20483:2006, which measures total nitrogen and converts it to protein using a conversion factor. Gluten quality is traditionally evaluated by determining wet gluten using standardized mechanical methods (ISO, 2006).

Importance of Protein Analysis in Wheat Flour

Wheat flour is a key ingredient in a wide range of food products, including bread, cakes, biscuits, crackers, pasta, and noodles. Flour quality is generally characterized by parameters such as total protein, gluten quality, amylose, and amylopectin content. Among these, total protein and wet gluten content play decisive roles in determining dough rheology, processing suitability, and final product performance.

Accurate and rapid determination of these parameters allows manufacturers to:

• Select the appropriate flour for specific product formulations
• Optimize processing conditions
• Ensure consistent product quality

Given the limitations of conventional methods, NIR spectroscopy implemented through instruments such as the BASTAK  9000 NIR provides a practical and efficient solution for modern flour and cereal analysis laboratories.

NIR-based protein analysis offers several advantages:

• Rapid analysis (results within seconds)
• No chemical reagents required
• Minimal or no sample preparation
• Non-destructive measurement
• Reduced operational costs and environmental impact

Studies have shown that NIR spectroscopy provides reliable protein predictions when properly calibrated against reference methods, making it suitable for routine quality control applications.See full specifications for the NIR grain and flour analyzer (DA 9000).