What Is Imidacloprid-d4 and Why Is It Used?

Imidacloprid-d4 is the deuterium-labeled form of imidacloprid, one of the most widely used neonicotinoid insecticides globally. In this analogue, four hydrogen atoms in the imidacloprid molecule are substituted with deuterium (²H), yielding a compound with nearly identical chemical behavior but a distinct mass shift detectable by mass spectrometry.

Because deuterium-labeled compounds co-elute with their unlabeled counterparts during chromatographic separation yet are resolved by mass spectrometry, Imidacloprid-d4 serves as an ideal internal standard (IS) for isotope dilution mass spectrometry (IDMS). This approach corrects for matrix effects, extraction losses, and instrument variability, improving the accuracy and precision of quantitative pesticide residue measurements.

Typical matrices analyzed using Imidacloprid-d4 as an IS include fruits, vegetables, cereals, honey, drinking water, surface water, and soil extracts.

Key Physicochemical Properties

Imidacloprid-d4 shares the core structural and physicochemical characteristics of imidacloprid, with a modest increase in molecular weight due to deuterium substitution. Key properties relevant to laboratory use include:

• Molecular formula: C₉H₆D₄ClN₅O₂ (review flag: confirm exact formula from certificate of analysis)
• Molecular weight: Approximately 259.7 g/mol (review flag: verify exact MW from CoA)
• Appearance: Typically a white to off-white solid or powder
• Solubility: Soluble in acetonitrile, methanol, and DMSO; limited aqueous solubility (review flag: confirm solubility data from CoA)
• Stability: Stable under recommended storage conditions; protect from light and moisture
• Recommended storage: Store at –20 °C or as specified on the product label

Users should always consult the Certificate of Analysis (CoA) and Safety Data Sheet (SDS) supplied with each lot for confirmed purity, exact molecular weight, and specific handling instructions.

Recommended Applications and Analytical Methods

Imidacloprid-d4 is principally applied in the following analytical workflows:

1. LC-MS/MS pesticide multi-residue methods: Added to sample extracts at a known concentration before cleanup and injection; used to calculate recovery-corrected results via isotope dilution.
2. QuEChERS-based food safety testing: Incorporated as an internal standard in QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) extraction protocols for fruits and vegetables, enabling accurate quantification even in difficult matrices.
3. Environmental monitoring: Used in water and soil analysis workflows to monitor neonicotinoid contamination in ecosystems.
4. Method validation studies: Employed to assess recovery, matrix effects, and measurement uncertainty in pesticide residue analytical method development.

Typical working concentrations and calibration ranges should be determined empirically for each matrix and instrument system. Consult published regulatory guidance (e.g., SANTE/11312/2021 for EU food safety) for acceptance criteria.

Handling, Safety, and Storage Guidelines

Although Imidacloprid-d4 is used in trace quantities as an analytical standard, it retains the intrinsic toxicity profile of imidacloprid, a potent nicotinic acetylcholine receptor agonist. Researchers should observe the following precautions:

• Wear appropriate personal protective equipment (PPE): lab coat, nitrile gloves, and safety glasses.
• Handle in a well-ventilated fume hood to minimize inhalation exposure.
• Avoid contact with skin, eyes, and mucous membranes.
• Dispose of waste in accordance with local regulations governing pesticide standards and organic solvents.
• Store at –20 °C in a tightly sealed container, away from light and moisture. Avoid repeated freeze-thaw cycles to preserve isotopic integrity and compound stability.
• Refer to the product-specific SDS (available from Aladdin Scientific) for full hazard classification, first-aid measures, and disposal information.

Stock solutions are typically prepared in acetonitrile or methanol at concentrations of 100–1000 µg/mL, then diluted to working concentrations (review flag: confirm recommended stock concentration from CoA/product insert).

Ordering and Product Information

Imidacloprid-d4 is available from Aladdin Scientific under the following details:

• SKU: I335077
• Santa Cruz Cross-Reference: sc-300824
• Supplier: Aladdin Scientific

To place an order, contact your local Aladdin Scientific representative or visit the Aladdin Scientific website. For bulk quantities, custom packaging, or certificate of analysis requests, please reach out to the technical support or customer service team. Pricing, available pack sizes, and current stock levels are available on the product page or upon request from procurement.

For regulatory compliance, ensure that the lot-specific CoA is retained for audit purposes, particularly in food safety laboratories operating under ISO 17025 or equivalent accreditation.