स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण

अवशोषण स्पेक्ट्रा द्वारा कृत्रिम खाद्य रंगों की पहचान

Colorimetry Intermediate (High School) 60 मिनट ~$8.00

उद्देश्य

व्यावसायिक पेय पदार्थों में कृत्रिम खाद्य रंगों की पहचान और सांद्रता उनके अवशोषण स्पेक्ट्रा को मापकर निर्धारित करें।

पृष्ठभूमि

Artificial food dyes have characteristic absorption spectra that serve as fingerprints for identification. FD&C Red No. 40 absorbs maximally at 504 nm, Blue No. 1 at 630 nm, and Yellow No. 5 at 428 nm. By scanning the absorption spectrum of a commercial beverage and comparing peak wavelengths with known dye spectra, students can identify which dyes are present and estimate their concentrations.

सुरक्षा चेतावनियाँ

  • Food dyes can stain clothing
  • Do not drink any samples after use in the lab
  • Handle cuvettes by the frosted sides only

आवश्यक PPE

goggles lab_coat

सामग्री

  • Standard food dye solutions (50 mL each)
    Red 40, Blue 1, Yellow 5 (0.01%)
  • Commercial beverages (50 mL each)
    2–3 colored drinks
  • Distilled water (200 mL)
    For dilutions and blank

उपकरण

UV-Vis spectrophotometer (or colorimeter with multiple filters) Cuvettes (quartz or plastic) Pipettes Volumetric flasks (25 mL, 4 total)

प्रक्रिया

1

If using a spectrophotometer, scan each standard dye solution from 400 to 700 nm to identify the λmax (wavelength of maximum absorbance).

10 मिनट
2

Record the λmax for each standard: Red 40 (≈504 nm), Blue 1 (≈630 nm), Yellow 5 (≈428 nm).

5 मिनट
3

Dilute commercial beverage samples if too concentrated (absorbance should be below 1.0). Record all dilution factors.

10 मिनट
4

Scan each beverage sample from 400 to 700 nm. Record the absorption spectrum.

15 मिनट
5

Compare the beverage absorption peaks with the standard dye λmax values to identify which dyes are present.

10 मिनट
6

If a calibration curve was prepared for a specific dye, calculate the dye concentration in each beverage (accounting for dilution).

10 मिनट

अपेक्षित परिणाम

Each beverage should show absorption peaks matching one or more standard food dyes. Green drinks typically contain both Blue 1 and Yellow 5. Orange drinks often contain Red 40 and Yellow 5.

सफाई

Pour dilute dye solutions down the drain with running water. Rinse cuvettes immediately to prevent staining.

Frequently Asked Questions

What is the objective of स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण?
व्यावसायिक पेय पदार्थों में कृत्रिम खाद्य रंगों की पहचान और सांद्रता उनके अवशोषण स्पेक्ट्रा को मापकर निर्धारित करें।
How difficult is स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण?
Key safety precautions include: Food dyes can stain clothing; Do not drink any samples after use in the lab; Handle cuvettes by the frosted sides only.
What materials are needed for स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण?
The main materials required are: Standard food dye solutions, Commercial beverages, Distilled water.
What results should I expect from स्पेक्ट्रोफोटोमेट्री द्वारा खाद्य रंग विश्लेषण?
Each beverage should show absorption peaks matching one or more standard food dyes. Green drinks typically contain both Blue 1 and Yellow 5. Orange drinks often contain Red 40 and Yellow 5.