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Related Concept Videos

Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
Allergic Reactions02:06

Allergic Reactions

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Relationship between nickel allergy and diet.

Ashimav Deb Sharma1

  • 1dradsharma_bngn@rediffmail.com

Indian Journal of Dermatology, Venereology and Leprology
|October 9, 2007
PubMed
Summary

Nickel allergy, a persistent skin condition, is commonly triggered by dietary nickel. Reducing nickel intake through careful food selection can significantly benefit sensitive individuals.

Area of Science:

  • Environmental Science
  • Dermatology
  • Toxicology

Background:

  • Nickel is a widespread trace element found in soil, water, and air.
  • It is a primary component in stainless steel manufacturing.
  • Nickel allergy is a prevalent, chronic skin condition, more common in females.

Purpose of the Study:

  • To investigate the role of dietary nickel in triggering allergic dermatitis.
  • To assess the impact of nickel exposure from food on nickel-sensitive individuals.
  • To explore dietary modifications for managing nickel allergy.

Main Methods:

  • Review of existing literature on nickel occurrence and human exposure.
  • Analysis of dietary sources contributing to nickel intake.
  • Correlation of dietary nickel levels with dermatitis exacerbation in sensitive patients.

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Last Updated: Jul 11, 2026

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Main Results:

  • Food is a major source of nickel exposure for the general population.
  • Dietary nickel content varies geographically due to soil composition.
  • High-nickel foods can provoke dermatitis in nickel-sensitive individuals.

Conclusions:

  • Careful selection of low-nickel foods can reduce daily dietary nickel intake.
  • Dietary management is crucial for improving outcomes in patients with nickel allergy.
  • Reducing nickel exposure through diet offers a beneficial strategy for managing nickel-sensitive conditions.