Description:DESCRIPTION OF INVENTION
FIELD OF THE INVENTION
The present invention relates to the field of food safety and quality monitoring, particularly in the context of meat and dairy products.
More Specifically, the invention focuses on the development of a colorimetric paper designed to provide real-time visual indicators of spoilage in raw meat and dairy items.
BACKGROUND OF THE INVENTION
Foodborne illnesses are a significant global health concern, with raw meat along with dairy products being a primary vector for such illnesses when it is improperly stored or handled. The spoilage of raw meat and dairy products at room temperature are common issues that often leads to foodborne diseases. Traditional indicators of meat spoilage, such as foul odours, are not always reliable, and in some cases, spoilage may occur without obvious sensory cues, leading to unsafe consumption. This invention, a colorimetric indicator paper, addresses this critical issue by providing a simple, effective, and visually detectable method to indicate meat spoilage, thereby enhancing food safety practices.
Meat is one of the most consumed food commodities worldwide. In developed countries, meat consumption has significantly increased, reflecting its importance in the human diet. However, meat is also one of the most perishable food products due to its moderate pH and high nutrient and moisture content, which provide an ideal environment for microbial growth. Spoilage in meat is primarily caused by microbial growth, lipid oxidation, and enzymatic autolysis. These processes lead to nutrient degradation, off-odours, slime formation, and discoloration, rendering the meat unfit for human consumption.
Given the high perishability of meat, detecting spoilage is crucial to prevent foodborne illnesses. Various methods have been developed for detecting spoilage, including direct and indirect detection of spoilage bacteria. Popular methods include ATP bioluminescence, fluorescent techniques, and molecular methods like multiplex polymerase chain reaction (PCR). Other approaches involve screening for microbial metabolites or using electronic noses and gas sensors to detect volatile compounds produced during spoilage. Spectroscopy techniques such as Fourier transform infrared spectroscopy (FTIR), electrical impedance spectroscopy (EIS), and near-infrared spectroscopy (NIR) are also employed. Recently, smartphone-based technologies with various attachments have been introduced, enabling high-end equipment functions like biosensors and calorimeters to detect spoilage.
Despite these advancements, existing technologies often have limitations such as lack of specificity, sensitivity, selectivity, and stability. Moreover, many of these methods are complex, expensive, and not easily accessible for everyday use by consumers. Hence, there is a need for a more practical, cost-effective, and user-friendly solution to detect meat spoilage, particularly for home use.
The present invention addresses the limitations of the existing state of the art and describes a colorimetric paper for real-time monitoring of meat and dairy product freshness.
OBJECTS OF THE INVENTION
The primary object of the invention is to provide a colorimetric paper for real-time monitoring of meat and dairy product freshness.
Further important object of the invention to provide a colorimetric paper that is easy to manufacture using readily available and FDA-approved materials, ensuring safety for food contact.
Additionally, the invention aims to offer a colorimetric paper that is cost-effective and accessible for everyday use, requiring no special equipment or training for interpretation of results.
The invention seeks to provide an early warning system for meat and dairy spoilage, allowing consumers to make informed decisions about the safety of the products before consuming them, thus preventing foodborne illnesses.
Furthermore, the invention aims to enable real-time monitoring of meat and dairy product freshness, contributing to improved food safety practices in both domestic and commercial settings.
BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings constitute a part of this specification and illustrate one or more embodiments of the invention. Preferred embodiments of the invention are described in the following with reference to the drawings, which are for the purpose of illustrating the present preferred embodiments of the invention and not for the purpose of limiting the same.
For simplicity and clarity of illustration, the drawing figures illustrate the general manner of construction, and descriptions and details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the invention. Additionally, elements in the drawing figures are not necessarily drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of embodiments of the present invention. The same reference numerals in different figures denotes the same elements.
In the drawings:
Figure 1 shows color change of the colorimetric paper with chicken meat at different temperatures. Samples a1, a2, and a3 were stored at 4°C, and their freshness was monitored using colorimetric paper every hour. Similarly, samples b1, b2, and b3 were kept at 20°C under air conditioning, and their freshness was monitored hourly with colorimetric paper. Samples c1, c2, and c3 were kept at 33°C at room temperature, and their freshness was also monitored hourly with colorimetric paper. The colorimetric paper in sample c3 changed color from blue to yellow, indicating the spoilage of the raw meat. In sample c2, the colorimetric paper changed color, indicating that the meat had started to lose its freshness but was still safe to consume. Additionally, the colorimetric paper did not change color when the chicken was stored at 4°C or under air conditioning.
Figure 2 shows the color change of the colorimetric paper with beef meat at different temperatures. Samples a1, a2, and a3 were stored at 4°C, with freshness monitored hourly using colorimetric paper. Similarly, samples b1, b2, and b3 were kept at 20°C under air conditioning, with hourly freshness checks using colorimetric paper. Samples c1, c2, and c3 were kept at 33°C at room temperature, with freshness also monitored hourly using colorimetric paper. In sample c3, the colorimetric paper changed color from blue to yellow, indicating meat spoilage. In sample c2, the paper changed color, showing that the meat had begun to lose its freshness but was still safe to consume. Additionally, the colorimetric paper did not change color when the beef was stored at 4°C or under air conditioning.
Figure 3 shows color change of the colorimetric paper with paneer at different temperatures. Samples a1, a2, and a3 were stored at 4°C, with freshness monitored hourly using colorimetric paper. Similarly, samples b1, b2, and b3 were kept at 20°C under air conditioning, with hourly freshness checks using colorimetric paper. Samples c1, c2, and c3 were kept at 33°C at room temperature, with freshness also monitored hourly using colorimetric paper. In sample c3, the colorimetric paper changed color from blue to yellow, indicating spoilage. In sample c2, the paper changed color, showing that the paneer had begun to lose its freshness but was still safe to consume. Additionally, the colorimetric paper changed color when the paneer was stored under air conditioning after 1 hour but was still safe to consume.
SUMMARY OF THE INVENTION
Embodiments of the present disclosure provide technological advancements that address one or more of the technical issues with the aforementioned concerns that the inventor has identified in the approaches currently used.
The present disclosure introduces a colorimetric paper for real-time monitoring of meat and dairy product freshness designed to identify the spoilage of raw meat by changing color after the meat has been left at room temperature for more than two hours. The invention leverages the release of specific gases during bacterial growth as a spoilage indicator, providing a simple and effective means for consumers to detect meat spoilage and thus prevent foodborne illnesses.
According to an aspect of the present invention, the colorimetric paper is fabricated from a polyvinyl alcohol (PVA)-agar base embedded with bromothymol blue dye. The paper detects gases emitted by microorganisms during spoilage, changing color from blue to yellow as the freshness of the product deteriorates. This color change provides an immediate and easily interpretable indication of the product's quality.
In practical application, meat samples (beef and chicken) and paneer were tested at three different temperatures: 4°C (refrigeration), 20°C (air-conditioned room), and 33°C (room temperature). The colorimetric paper reliably indicated spoilage through a color change, with faster responses at higher temperatures. For instance, at 33°C, the paper indicated spoilage within one to two hours, while no color change was observed at 4°C, signifying maintained freshness.
This colorimetric paper is designed to provide a clear visual indication of spoilage, making it an effective tool for ensuring food safety in various environments, including supermarkets, transportation, and household storage. This invention offers a cost-effective, user-friendly solution for monitoring the freshness of raw meat and dairy products, eliminating the need for complex equipment or specialized training. It enhances food safety by providing real-time, visual alerts of spoilage, thereby preventing the consumption of spoiled food and reducing the risk of foodborne illnesses.
The objects and the advantages of the invention are achieved by the process elaborated in the present disclosure.
DETAILED DESCRIPTION OF THE INVENTION
The following detailed description illustrates embodiments of the present disclosure and ways in which the disclosed embodiments can be implemented. Although some modes of carrying out the present disclosure have been disclosed, those skilled in the art would recognize that other embodiments for carrying out or practicing the present disclosure are also possible.
The present disclosure pertains to a colorimetric indicator paper designed to identify the spoilage of raw meat by changing color after the meat has been left at room temperature for more than two hours. The invention leverages the release of specific gases during bacterial growth as a spoilage indicator, providing a simple and effective means for consumers to detect meat spoilage and thus prevent foodborne illnesses.
The colorimetric paper consists of several components: Polyvinyl Alcohol (PVA), an FDA-approved synthetic polymer that forms the base of the paper; Agar, a gelatinous substance derived from seaweed, which provides structural integrity; Glycerol, a polyol compound added to enhance flexibility and prevent brittleness; and Bromothymol Blue Dye, a pH-sensitive dye that changes color in response to volatile compounds produced during meat spoilage.
The manufacturing process involves several steps to ensure the precise composition and functionality of the product. First, prepare a solution with 8% PVA and 1% agar in a 2:1 weight ratio, mixing thoroughly on a magnetic stirrer until both components are fully dissolved and homogeneously blended. Next, add 5% glycerol to the solution to enhance flexibility, continuing to stir for even distribution. Then, incorporate 30% of a 0.1% bromothymol blue dye solution into the mixture, stirring until the dye is uniformly distributed. Finally, pour the resulting solution into a petri plate or any flat, mold-like container and allow it to solidify at room temperature overnight. This process yields a solidified paper matrix that is flexible and capable of detecting spoilage gases.
The colorimetric paper operates based on its interaction with gases emitted by spoiled meat. When integrated into the packaging of raw meat or placed directly in contact with the meat surface within a package, the paper initially retains its original color, indicating that no spoilage has occurred. If the meat is left at room temperature for more than two hours, bacterial activity increases, leading to the production of spoilage gases such as ammonia and other nitrogenous compounds. The bromothymol blue dye in the paper reacts with these gases, causing a visible color change from blue (alkaline) to yellow (acidic) as the pH decreases due to the presence of spoilage gases. This color change provides a clear, visual indication that the meat has been at an unsafe temperature for too long and is likely spoiled, allowing consumers to decide whether the meat is safe to consume or should be discarded.
This invention offers several advantages: it is made with FDA-approved materials, ensuring safety for food contact; it utilizes inexpensive and widely available materials, making it cost-effective and accessible for everyday use; it is easy to understand and use, requiring no special equipment or training to interpret the results; and it provides an early warning of meat spoilage before more noticeable signs, like foul odours, develop. This detailed description outlines the steps and materials necessary for a person skilled in the art to replicate and utilize the invention effectively, enhancing food safety practices in a straightforward and economical manner.
Working Example
Fresh meat samples (beef and chicken) were purchased from the local market and brought to the lab. Each sample, weighing 25 grams, was packed in an airtight packet with a piece of colorimetric paper attached. These packets were stored at three different temperatures: 4°C, room temperature with air conditioning maintained at 20°C, and normal room temperature around 33°C.
Under normal room temperature conditions (33°C), the colorimetric paper changed color after one hour, indicating that the fresh meat was starting to lose its freshness. After two hours, the color completely changed, indicating the spoilage of the raw meat.
A similar experiment was conducted with paneer, and the colorimetric paper again changed color, demonstrating its potential use in the dairy industry. This confirms the effectiveness of the colorimetric paper in providing a visual indication of spoilage, allowing for real-time monitoring of meat and dairy product freshness.
These embodiments are provided to demonstrate the various aspects and features of the a colorimetric paper for real-time monitoring of meat and dairy product freshness. The invention is not limited to these specific embodiments and can be implemented in different configurations and variations without departing from the scope of the invention as defined in the claims. , Claims:CLAIMS:
We Claim:
1. A colorimetric paper for real-time monitoring of meat and dairy product freshness, the said colorimetric paper comprising:
- Polyvinyl Alcohol (PVA) as the base material;
- Agar for structural integrity;
- Glycerol to enhance flexibility and prevent brittleness;
- Bromothymol Blue Dye as a pH-sensitive colorimetric indicator, wherein the paper is configured to change color in response to gases emitted by spoiled meat after the meat has been left at room temperature for more than two hours.
2. The colorimetric paper as claimed in Claim 1, wherein the PVA and agar are mixed in a 2:1 weight ratio with 8% PVA concentration and 1% agar concentration.
3. The colorimetric paper as claimed in Claim 1, wherein 5% glycerol is added to the PVA-agar mixture to improve the flexibility of the final product.
4. The colorimetric paper as claimed in Claim 1, wherein 30% of a 0.1% bromothymol blue dye solution is incorporated into the PVA-agar-glycerol mixture as the colorimetric indicator.
5. The colorimetric paper as claimed in Claim 1, wherein the PVA-agar base with the bromothymol blue dye is prepared by:
- mixing 8% PVA and 1% agar in a 2:1 ratio using a heating magnetic stirrer;
- adding 5% glycerol and stirring for 10 minutes;
- incorporating 0.1% bromothymol blue dye into the mixture;
- pouring the mixture into a petri dish and allowing it to gelatinize at room temperature overnight;
- cutting the gelatinized mixture into pieces of colorimetric paper.