Researchers unveil a new LC-MS/MS test for fungicide residues in grapes, raisins, grape leaves

Researchers have reported a new LC-MS/MS method to measure seven strobilurin fungicides in grape berries, raisins, and grape leaves, pairing the laboratory work with a check on residue-limit compliance and an estimate of both acute and chronic dietary risk.

The study was published in the Journal of Saudi Chemical Society and focuses on a question that reaches beyond academic chemistry. Grapes move through several food and beverage chains, from fresh fruit and dried fruit to wine and other grape-based products, and residue testing plays a central role in both consumer safety and trade. By examining berries, raisins, and leaves together, the researchers addressed three forms in which the crop is commonly consumed and marketed.

Strobilurin fungicides are widely used to control fungal diseases that can damage vineyards and reduce yields. Their use has made them a regular target for residue monitoring, especially in crops such as grapes that are eaten fresh and also processed. In the case of grape leaves, the issue has an added food-safety dimension because the leaves are consumed directly in several cuisines. Raisins, meanwhile, can concentrate residues because they are dehydrated, making them a useful product category for compliance checks.

The researchers used liquid chromatography with tandem mass spectrometry, known as LC-MS/MS, a standard high-sensitivity technique for detecting pesticide residues at low levels. In practical terms, the method allows laboratories to separate compounds in a sample and then identify and quantify them with a high degree of precision. That matters when regulators and food businesses need to know not only whether a fungicide is present, but also whether it remains within legal maximum residue limits.

According to the study summary, the work had three main aims: to quantify seven strobilurin fungicides in the three grape-derived materials, to evaluate compliance with residue limits, and to estimate dietary risk from consumption. Acute risk assessments are designed to capture possible short-term exposure from eating a food over a brief period, while chronic assessments look at repeated exposure over time. Together, those two measures help regulators, growers, processors, and buyers judge whether the use pattern of a crop-protection product stays within accepted safety margins.

The paper arrives at a time when residue testing carries growing weight in the grape sector. Vineyard disease pressure remains a constant concern for growers, but so do export rules, retailer requirements, and tighter quality controls across the food system. Even when pesticide use is legal and agronomically justified, the burden remains on producers and handlers to show that residues meet national or international standards. For grapes in particular, that can shape harvest timing, spray programs, pre-harvest intervals, and sourcing decisions.

The beverage industry also has a stake in that work, even when the research is centered on food matrices rather than bottled products. Grapes are the foundation of wine, and residue findings in raw fruit can influence how wineries, cooperatives, and grape buyers manage procurement and compliance. Analytical evidence of this kind can help guide decisions on crop-protection programs in vineyards and strengthen monitoring along the supply chain. It may also help companies prepare for customer audits or export documentation in markets where residue rules are closely enforced.

Studies like this one do not only test finished samples. They also help validate the tools that public and private laboratories use in routine screening. For regulators, import inspectors, and food companies, a reliable LC-MS/MS method can improve consistency between laboratories and reduce uncertainty in enforcement. That becomes especially important when the same crop appears in different commercial forms, such as fresh grapes, dried grapes, and edible leaves, each with its own processing effects and consumption patterns.

The available summary of the paper does not provide the numerical residue results or the final risk values, but the scope of the study makes clear that the authors were trying to connect analytical detection with real-world compliance and exposure questions. That link is often where scientific papers become most useful to the market. A residue concentration on its own says little unless it is compared with legal limits and then translated into a dietary intake estimate.

For grape growers, one likely value of the research is operational. Residue data on multiple grape products can support more informed choices about which fungicides to use, when to use them, and how to manage the interval between treatment and harvest. For raisin processors and food packers, such data can help identify where closer monitoring may be needed. For buyers of grape leaves, which may receive less public attention than fruit, the study adds evidence on a part of the crop that still requires the same level of safety control.

The paper also reflects a broader trend in food analysis. Scientific journals have published a steady flow of research aimed at faster, more sensitive, and more comprehensive pesticide testing as supply chains become more complex and tolerance for compliance errors becomes smaller. In that environment, methods that can measure several compounds in a single run are especially useful because they save time and lower the cost of surveillance.

For consumers, the study speaks to a basic question that sits behind much of modern food regulation: whether products that reach the market comply with established residue standards and whether the resulting exposure stays within accepted health thresholds. For the grape and wine trade, it points to the same issue from a business angle. Reliable residue testing can affect market access, contract terms, and confidence in vineyard management practices long before grapes are crushed, dried, or sold fresh.