Laboratory reports recently acquired by the Freedom of Information Law from the New York State Department of Agriculture and Markets show the Sol Andino brand ground cumin to contain 1090 ppm lead as well as 259 ppm chromium. The spice was also analyzed by IS:2446, 1980 method, “Detection of Lead Chromate in Chillies, Curry Powder and Turmeric by diphenyl carbizide.” A positive result was given, indicating the presence of hexavalent chromium, which is a component of lead chromate. Lead chromate is a yellow pigment, not allowed in food anywhere in the world as it is toxic, containing both lead and hexavalent chromium. The New York State Department of Agriculture and Markets posted a Class I recall of the Sol Andino ground cumin on July 10, 2017, without mention of the extremely high concentration of lead in the product.
The author could find no record of an FDA recall for the Sol Andino brand cumin powder containing excessive lead.
Some of us remember the four FDA Class I recalls of Pran brand turmeric for excessive lead in October 2013. These recalls were initiated by the New York State Health Department due to an illness complaint—most likely a child with high blood lead levels. The recalled Pran brand turmeric contained 28–53 ppm lead.
“There have been two cases of high blood levels of lead associated with this product to date. Both cases have been reported through the Illinois Department of Public Health, Environmental Health Protection.”
According to the recall, the “Thyme” was found to contain 422 ppm lead.
Wondering if the 422 ppm lead was caused by adulteration of the “Thyme” with lead chromate or another lead pigment, a food chemist at the New York State Food Laboratory (a Division of NYS Dept. of Agriculture and Markets) requested from Illinois a sub-sample of the “Thyme” for analysis. Lab analysis of the spice found 323 ppm lead, 109 ppm chromium and a positive result for the chromate test. Thus, this recalled “Thyme” contains lead chromate.
In both cases, Pran turmeric and Nabelsi Thyme, illness complaints led to the recall of lead adulterated spices.
The New York State Department of Agriculture and Markets has a proactive program. Random samples of spices are sampled from retail markets and subsequently analyzed for unallowed colorants, undeclared allergens and heavy metals. In 2016 this resulted in the Oriental Packing Class I recall of 377,000 lb. of turmeric containing spices for excessive lead. (A typo in the FDA recall attributes the recall to the New York State Health Department, instead of the New York State Dept. of Agriculture and Markets.)
Still, it’s even better to analyze spices being imported into the country at receiving warehouses before the product reaches retail markets. Lead concentrations above 10 ppm can be determined instantaneously with a handheld XRF analyzer.
Food fraud is a recognized threat to the quality of food ingredients and finished food products. There are also instances where food fraud presents a safety risk to consumers, such as when perpetrators add hazardous substances to foods (e.g., melamine in milk, industrial dyes in spices, known allergens, etc.).
The tables in Appendix 1 include 17 food categories and are presented in three series:
Information that you should consider for potential food-related biological hazards
Information that you should consider for potential food-related chemical hazards
Information that you should consider for potential process-related hazards
According to the FDA draft guidance, chemical hazards can include undeclared allergens, drug residues, heavy metals, industrial chemicals, mycotoxins/natural toxins, pesticides, unapproved colors and additives, and radiological hazards.
USP develops tools and resources that help ensure the quality and authenticity of food ingredients and, by extension, manufactured food products. More importantly, however, these same resources can help ensure the safety of food products by reducing the risk of fraudulent adulteration with hazardous substances.
Data from food fraud records from sources such as USP’s Food Fraud Database (USP FFD) contain important information related to potential chemical hazards and should be incorporated into manufacturers’ hazard analyses. USP FFD currently has data directly related to the identification of six of the chemical hazards identified by FDA: Undeclared allergens, drug residues, heavy metals, industrial chemicals, pesticides, and unapproved colors and additives. The following are some examples of information found in food fraud records for these chemical hazards.
Undeclared allergens: In addition to the widely publicized incident of peanuts in cumin, peanut products can be fraudulently added to a variety of food ingredients, including ground hazelnuts, olive oils, ground almonds, and milk powder. There have also been reports of the presence of cow’s milk protein in coconut-based beverages.
Drug residues:Seafood and honey have repeatedly been fraudulently adulterated with antibiotics that are not permitted for use in foods. Recently, beef pet food adulterated with pentobarbital was recalled in the United States.
Heavy metals:Lead, often in the form of lead chromate or lead oxide which add color to spices, is a persistent problem in the industry, particularly with turmeric.
Industrial Chemicals: Industrial dyes have been associated with a variety of food products, including palm oil, chili powder, curry sauce, and soft drinks. Melamine was added to both milk and wheat gluten to fraudulently increase the apparent protein content and industrial grade soybean oil sold as food-grade oil caused the deaths of thousands of turkeys.
Pesticides: Fraud in organic labeling has been in the news recently. Also concerning is the detection of illegal pesticides in foods such as oregano due to fraudulent substitution with myrtle or olive leaves.
Unapproved colors/additives: Examples include undeclared sulfites in unrefined cane sugar and ginger, food dyes in wine, and tartrazine (Yellow No. 5) in tea powder.
Because of its high nutritional value and distinctive flavor, natural honey is a premium product with a price tag significantly higher than that of other sweeteners. As a result, honey is often the target of adulteration using low-cost invert sugar syrups. This article looks at two analytical approaches based on isotope fingerprint analysis using isotope ratio mass spectrometry (IRMS) that can be used to detect honey adulteration and safeguard product integrity.
Honey is a complex mixture of sugars, proteins and other compounds, produced in nature by honeybees from flower nectar or honeydew. The extent to which its sugars are present is heavily dependent on the floral source and differs significantly between honeys produced in different regions. Climate, processing and storage conditions can also have an effect on the amounts of these sugars.1
Fructose and glucose are the major components of honey, and account for 85–95% of the total sugars present. The remaining carbohydrates are a mixture of disaccharides, trisaccharides, and larger oligosaccharides, which give individual honeys their own characteristic taste.
These distinctive flavors, combined with honey’s renowned nutritional benefits and a growing consumer demand for natural, healthy ingredients, have contributed to a substantial increase in honey sales over the past few decades. However, this demand has also helped to raise costs, with some varieties, such as Manuka honey, reportedly selling for as much as $35 for a 250 gm jar.
Just like many other food products that have a premium price tag, intentional adulteration is a significant concern for the honey industry. The fraudulent addition of cheaper sweeteners, such as sugar derived from cane, corn and beet sources, to extend product sales, is unfortunately common within the marketplace.
Honey producers and suppliers therefore require reliable and accurate analytical techniques to profile the composition of honey to identify cases of adulteration. Using analytical data, honey adulteration and counterfeiting can be routinely identified and product integrity can be maintained.
Carbon Isotope Fingerprints of Honey
Analysis of honey is commonly undertaken using isotope ratio mass spectrometry (IRMS) for the detection of adulteration. Honey has a fingerprint, a unique chemical signature that allows it to be identified. To visualize this fingerprint, IRMS can be used to identify the botanical origin of its constituent sugars.
Two ways that carbon can be incorporated into plants by photosynthetic CO2 fixation are the Calvin cycle (also known as the C3 cycle) and Hatch-Slack cycle (the C4 cycle). The nectar used by bees to produce honey comes from plants that produce sugars via the C3 pathway, while the sugars derived from sugar cane and corn are produced by the C4 pathway.
Carbon naturally exists as two stable isotopes that behave in the same way, but possess different atomic mass numbers. Carbon-12 is the most abundant in nature (98.9%), whereas carbon-13 is far less common (1.1%). By measuring the ratio of carbon-13 to carbon-12 (13C/12C) using IRMS, the carbon isotope fingerprint of the honey can be determined. As more carbon-13 is incorporated in sugars produced by the C4 pathway, the adulteration of honey with sugar cane and fructose corn syrups, rich in C4 sugars, can be detected.
In unadulterated honey, the carbon isotope fingerprint will be similar to that of the natural protein precipitated from the honey. However, if cane sugar or high fructose corn syrup has been added, the isotope fingerprint of honey and protein will be significantly different.
Detection of Adulteration by EA-IRMS
One approach that has traditionally been used for the detection of honey adulteration is elemental analysis interfaced with IRMS (EA-IRMS).2 This highly robust, rapid and cost-effective technique is able to reliably detect the addition of C4 sugars in honey at levels down to 7%.3 The analytical approach complies with the official method for the analysis of C4 sugars in honey, AOAC method 998.12.4
In EA-IRMS, bulk honey is combusted in the presence of pure oxygen to form CO2 for analysis. The CO2 produced from the combustion of the bulk honey, including all sugars and the protein fraction, is analyzed by IRMS. Figure 1 shows carbon isotope fingerprints of four unique samples, including bulk honey and the proteins extracted from those honeys, determined using an EA-IRMS system. In each case of adulteration, shown in the grey columns, the honey δ13C value becomes more positive relative to the protein value, moving towards the carbon isotope fingerprint of C4 plants. The natural variation of δ13C in honey is shown by the red lines.5
Detection of Adulteration by LC-IRMS
While EA-IRMS can be used to identify cases of honey adulteration using the bulk sample, the analysis of low levels of added C4 sugars and C3 sugars (i.e., beet sugars) to honey reveal that a compound specific technique with more powerful separation capabilities is needed. Furthermore, as fraudsters develop more sophisticated adulteration techniques and effective ways of concealing their actions, it can be necessary to utilize other IRMS techniques.
Much lower limits of adulteration detection can be obtained from liquid chromatography interfaced with IRMS (LC-IRMS). This technique permits the analysis of very small sample amounts without the need for extensive preparation or derivatization, and can also identify C3 sugar adulteration, which EA-IRMS cannot readily achieve, and therefore serves as a strong, complimentary isotope fingerprint technique. There are IRMS portfolios available that allow for sequential automated analysis of both analytical techniques.
Using LC-IRMS, the sample is oxidized within the aqueous solvent eluting from the HPLC column. The oxidation reagent consists of two solutions: The oxidizing agent itself and phosphoric acid. Both are pumped separately and added to the mobile phase. Within this mixture, all individual organic compounds eluting from the HPLC column are oxidized quantitatively into CO2 upon passing through a heated reactor. In a downstream separation unit, the generated CO2 is then separated from the liquid phase and carried by a stream of helium gas. The individual CO2 peaks in the helium are subsequently dried in an on-line gas drying unit and admitted to the isotope ratio mass spectrometer via an open split interface.
In the following article, the author reports finding Sudan dye in spices in New York State, making the argument for Class I recalls.
In New York State (NYS), Department of Agriculture and Markets food inspectors routinely sample domestic and imported food from retail markets for food dye determination. For decades, the NYS Food Lab has examined both domestic and imported food for undeclared allowed food dyes and unallowed food dyes utilizing a paper chromatography method. This method works well with water-soluble acid dyes, of which food dyes are a subset.
The NYS Food Lab has participated in four sets of the FAPAS proficiency tests: Artificial Colours in Soft Drinks and Artificial Colours in Sugar Confectionary (Boiled Sweets). The qualitative analysis was by paper, thin layer silica and thin layer cellulose chromatography. Satisfactory results were obtained.
The paper/thin layer chromatography method is a qualitative non-targeted method and has a limit of detection of approximately 1 to 5 ppm (parts per million) depending on the dye. If an unallowed dye is detected, the food product is violated as adulterated and results are forwarded to the FDA.
Some countries have a maximum concentration of allowed food dye in a food product. For example India has a 100 ppm to 200 ppm maximum for their allowed food dyes, in some food, singly or in combination.1
In early 2011, a food sample of pink colored sugar coated sesame seed from Pakistan was sent to the lab for color determination. The paper chromatography method could not determine any dyes. (As found out later, the unknown pink dye was not an acid dye.) From research it was found that Rhodamine B was a pink water soluble basic dye commonly used as a food adulterant. A standard was ordered and then a qualitative high performance Liquid chromatography-tandem mass spectrometry (HPLC/MS/MS) method was developed (Waters UPLC Aquity w/Waters Premier XE triple quadrapole) to determine Rhodamine B. After utilizing this new method, Rhodamine B was found in the sugar coated sesame seed.
Rhodamine B is an industrial dye and is not allowed in food anywhere in the world. Industrial dyes are not allowed in food because they are toxic; in fact, some industrial dyes are used for suicide.2,3,4 In addition, industrial dyes are not made to “food grade” specifications with regard to dye purity, heavy metal (i.e., arsenic and lead) concentrations, subsidiary dye concentrations and concentrations of unreacted precursors. From additional research of news articles and research papers, more industrial dyes were identified as common food adulterants; more dye standards were ordered and incorporated into the HPLC/MS/MS method. The NYS Food Lab’s current HPLC/MS/MS surveillance method includes 36 compounds: Water soluble “acid dyes” and “basic dyes”, organic solvent soluble “solvent dyes”, and several pigments.
The HPLC/MS/MS method has a limit of detection in the ppb (parts per billion) range for some dyes and parts per trillion for other dyes. The FDA has an action level of 1 ppb for certain water-soluble basic dyes (such as Malachite Green) when used as a fish antibiotic. However, due to concern that unallowed dyes might be present due to contamination from packaging, the food lab subsequently set an action level of 1 ppm for unallowed dyes determined by the HPLC/MS/MS method. At levels over 1 ppm, detection of dyes in food would indicate intentional dye usage for coloring food.
The food lab has participated in three rounds of the FAPAS proficiency test, “Illegal Dyes found in Hot Pepper Sauce”. The qualitative analysis was by LC/MS/MS. Satisfactory results were obtained.
Sudan Dyes Considered to be Carcinogenic
“Sudan dyes are not allowed to be added to food. There has been worldwide concern about the contamination of chili powder, other spices, and baked foods with Sudan dyes since they may have genotoxic and carcinogenic effects (according to the International Agency for Research on Cancer)”.5
“There have been several documented cases of spices being contaminated with carcinogenic dyes such as Sudan I or lead oxide. We therefore assume that the presence of these chemicals in spice ingredients will be considered a reasonably foreseeable hazard under this rule.”6
“Sudan red dyes have been used to color paprika, chili powders, and curries, but are also known carcinogens and are banned for use in foods.” 7
Sudan Dyes are a family of more than 10 synthetic industrial “solvent dyes”. Solvent dyes are typically used to color oils and waxes, including shoe polish. Sudan dyes that the food lab has found in spices include Sudan 1 (Sudan I), and Sudan 4 (Sudan IV). Sudan 1, also known as Solvent Yellow 14, is an orange colored dye. Sudan 4, also known as Solvent Red 24, is a blue shade red colored dye.
Positive identification of Sudan 4 is often hindered by the existence of a positional isomer, Sudan Red B (Solvent Red 25). This problem was addressed by using the HPLC/MS/MS method with a transition unique to Sudan 4 (381.2 > 276.0). This information was obtained from one of the two corroborating labs. The food lab has recently identified a transition unique to Sudan Red B (381.2 > 366.1).
Sudan Dyes Found in Spices in Europe
In March 2001, Europe began discovering Sudan dyes in spices. A February 2017 search of Europe’s Rapid Alert System for Food and Feed (RASFF) for “unauthorised colour” and “sudan” in the “herbs and spices” food category resulted in 429 notifications.
The 429 RASFF notifications arranged by year and by maximum concentration reported of Sudan 1 and Sudan 4 during that year are listed in Table I.
In a search of the FDA’s Import Alert 45-02 (Detention Without Physical Examination and Guidance of Foods Containing Illegal and/or Undeclared Colors) the author could find no record of spices violated for Sudan dye adulteration.
In a search of the FDA’s Enforcement Reports the author could find no record of spices violated for Sudan dye adulteration.
Industrial Dyes in Food: Class II or Class I Recall?
The NYS Food Lab and the FDA routinely find imported food containing unallowed food dyes such as Ponceau 4R, Amaranth and Carmoisine. These unallowed food dyes are allowed for use in food in other parts of the world, while not allowed in the USA. Foods containing unallowed food dyes are violated as adulterated and a Class II recall will occur. Sudan dyes are not allowed as food dyes anywhere in the world. They are industrial dyes, used in coloring oils and waxes, such as shoe polish.
“Class I recall: A situation in which there is a reasonable probability that the use of or exposure to a violative product will cause serious adverse health consequences or death.
Class II recall: A situation in which use of or exposure to a violative product may cause temporary or medically reversible adverse health consequences or where the probability of serious adverse health consequences is remote.”8
With a Class II recall, there is no consumer notification. In contrast, as part of a Class I recall, a press release is issued. Consumers who have purchased the product might be informed and may discard the product or return it for a refund.
–UPDATE (5/27/2016)– The final rule has been published on the Federal Register‘s website. –END UPDATE–
FDA just released the final FSMA rule, “Mitigation Strategies to Protect Food Against Intentional Adulteration”. Under the rule, domestic and foreign food facilities must complete and maintain a written food defense plan that assesses their vulnerabilities to intentional contamination.
“Today’s final rule on intentional adulteration will further strengthen the safety of an increasingly global and complex food supply,” said Stephen Ostroff, M.D., incoming FDA deputy commissioner for foods and veterinary medicine in a press release. “The rule will work in concert with other components of FSMA by preventing food safety problems before they occur.”
The final rule will be published on the Federal Register tomorrow. To preview the PDF document, visit the Federal Register’s website.
Yesterday FDA released its Reportable Food Registry (RFR) and cited Listeria monocytogenes as generating the greatest number of reports (223), along with undeclared milk (27), in Year Five (from September 8, 2013–September 7, 2014).
FDA defines a reportable food as “an article of food/feed for which there is a reasonable probability that the use of, or exposure to, such article of food will cause serious adverse health consequences or death to humans or animals.” The purpose of the registry is to allow FDA to track patterns of food and feed adulteration in order to help the agency focus its already limited inspection resources.
Year Five saw 909 reportable food entries, including 201 primary reports regarding safety concerns with food or animal feed and 464 subsequent reports from suppliers or recipients of food or feed that was the subject of the primary reports, and 244 amended reports. The following food safety hazards were identified within the 201 primary reports in Year Five: Drug contamination, pathogenic E. coli, Listeria monocytogenes, nutrient imbalance, lead, Salmonella, undeclared allergens and undeclared sulfites. In addition, Salmonella, Listeria and undeclared allergens made up about 88% of the total primary entries for all five years of the RFR.
The report’s complete breakdown of the RFR submissions by year, along with identified commodities and hazards, is available on FDA’s website.
In remarks made at the Consumer Federation of America’s annual food policy conference this week, Benjamin C. Mizer, principal deputy assistant attorney general, stated that the federal government has made consumer safety a top priority. With this announcement comes an announced intention on the part of the U.S. Department of Justice (DOJ) to use “various enforcement tools that we have at our disposal,” and maintain a stronger partnership with FDA to go after companies that “introduce adulterated foods into interstate commerce”.
“In deciding whether to use our civil or our criminal enforcement tools, the Justice Department follows the same set of guidelines that apply to every criminal prosecution,” said Mizer. “Among other things, prosecutors evaluate the nature and seriousness of the offense, the deterrent effect of the prosecution and the culpability of the individuals or entities involved.” Criminal charges brought against a food company can be either misdemeanor or felony, and Mizer emphasized that misdemeanor violations can still result in “serious penalties”. He cited a case in which the owner and CEO of an egg production company in Iowa pled guilty to a misdemeanor and received three months in jail and one year supervised release, and was slapped with a $100,000 fine.
“In some cases, the facts are so egregious that it is appropriate for the Justice Department to bring the full force of the law to bear,” stated Mizer. “When we can show an intent to defraud or to mislead consumers or the FDA, a defendant can face felony charges.” To illustrate this scenario, Mizer referred to the landmark case against the Peanut Corporation of America, which is perhaps the most commonly referenced case in recent months, as many in the industry have voiced their opinion that it has set a precedent as to how the government will handle such situations moving forward.
This article was part of our April Fool’s special edition. While the information about the Interpol seizure is indeed factual, we made up the new detection method (EFAS). 35% of poll participants were correct in guessing that this was the article that contained false information.
This week Interpol-Europol announced its largest-ever seizure of fake foods and beverages across 57 countries over a four-month time period. In total, Operation Opson V seized 10,000 tones and 1 million liters of food products between November 2015 and February 2016, with the following topping the list:
Fertilizer-contaminated sugar from Khartoum, Sudan (nearly 9 tons)
Olives painted with copper sulphate solutions to enhance color (85+ tons)
“Today’s rising food prices and the global nature of the food chain offer the opportunity for criminals to sell counterfeit and substandard food in a multi-billion criminal industry which can pose serious potential health risks to unsuspecting customers. The complexity and scale of this fraud means cooperation needs to happen across borders with a multi-agency approach,” said Chris Vansteenkiste, cluster manager of the Intellectual Property Crime Team at Europol in an agency release.
Other seized products worthy of note include:
Chicken intestines preserved in formalin from Indonesia (70 kg)
Monkey meat from Belgium
Locusts (11 kg) and caterpillars (20 kg) from France
Fake whiskey from Zambia (1300 bottles)
Tilapia unfit for human consumption imported to Togo (24 tons)
Honey from Australia (450 kg)
And for the false information:
At a recent conference for food laboratory professionals, Gavin Rosenberg, Ph.D., discussed an emerging analytical method that could be game changing in detecting adulterated products in the field. Using electrostatic fluorescence absorbance spectroscopy (EFAS), Rosenberg’s lab has been able to probe the chemical composition of products, from liquids to bulk and high-moisture foods, while simultaneously assessing concentration in products such as meat and even spices. The rapid and portable method is also highly sensitive and can provide trace detection of pathogens, dyes, antibiotics and pesticides within 60 seconds.
“While still in the research stage, EFAS has been utilized in several studies and has successfully been shown to detect contaminants as well as ingredients that are frequently added to adulterate food products,” said Rosenberg. He indicated that his team will pursue initial applications of the product to identify adulteration of olive oil (nearly 70% of olive oil is adulterated or diluted) and ground beef, specifically in the European and Asian markets.
Increased media attention and consumer awareness of verifying ingredients, detecting allergens and effectively tracing the source of outbreaks has placed much higher scrutiny on food processors and manufacturers. With the anticipated FSMA final rule on intention adulteration (Focused Mitigation Strategies to Product Food Against Intentional Adulteration) expected in late spring, having the ability to effectively detect and address product contamination and adulteration will be of significant importance to manufacturers. In preparation for the upcoming Food Labs Conference March 7–8, Food Safety Tech sat down with Craig Schwandt, Ph.D., director of industrial services at McCrone Associates, to learn how contamination is currently affecting food companies and what they should be doing to protect their products and ensure consumer safety.
Craig Schwandt will be presenting “Contaminant Particle Identification: Establishing Provenance and Complying with FSMA” at this year’s Food Labs Conference | March 7–8 | LEARN MOREFood Safety Tech: What are the big issues facing the food industry related to product contamination?
Craig Schwandt: I think the biggest issue facing the food safety industry is realizing that FSMA, in its final ruling, comes with requirements to ensure food safety from farm to table. In the past, many [ingredients] were GRAs, or generally recognized as safe, so when there was a contaminant, [food companies] had a lot of liberty in disposing of the batch and weren’t too concerned about where it came from.
FSMA is going to require that [food companies] keep records of what contaminants are found, how they address it and whether it’s a recurring problem, and [that they] have a procedure in place to track back and [conduct] forensic analysis. In the analytical services industry we call it investigational analysis, which is a description of what actually takes place for ascertaining what the contaminant is and how it got there. That information is provided to clients so they can track back in their production process—all the way to the raw materials and then ascertain where the contaminants came from in that production chain.
The big challenge will be in recognizing that they have to start keeping records and then actually doing the investigation to determine what contaminants are there and determine where they’re coming in.
FST: Are companies taking the right steps to detect and identify contaminants in food?
Schwandt: Some of them do and some don’t. At last year’s Institute of Food Technologist’s conference in Chicago, there was a session on FSMA in which there were representatives from FDA, the Grocery Manufacturers Association and a major food company. I was a little bit shocked by the food company’s position. They felt they didn’t need to take all of the steps required by FSMA because they dealt directly with producers from all over the world. They felt removing intermediaries from their supply chain sufficiently protected their products from adulteration. This seems to be oversimplifying the production and supply chain process. Even though they may directly deal with farmers, there’s still opportunity from the time food stuff is harvested to being dried, placed in containers, and shipped from overseas to the U.S.—there are several steps where unintentional contaminants can arise. So to say they didn’t need to look at the potential for contamination because they dealt directly [with farmers] is a bit oversimplified. I think this perspective typifies some of the industry’s viewpoint at the moment.
The Foreign Supplier Verification Program specifically addresses this concern. Even companies that deal directly with producers and supplies in the country of the product’s origin will be required to demonstrate that they tested it and verified it as uncontaminated.
The understanding and recognition by suppliers of these new regulations is the biggest issue facing the food industry right now—especially now that the final rulings have been issued and we’re in the grace period before compliance with the regulation is required.
FST: What technologies are helping in the effort to fight product adulteration, especially as it relates to FSMA compliance?
Schwandt: Handheld instrumentation is making headway at identifying, at a gross scale, screening capabilities—handheld x-ray fluorescence instrumentation and handheld infrared spectroscopy, to identify things at the bulk level. Mass spectrometry methods and chromatography are exceptional at their ability to do really fast general screening for chemical adulterants. I think many of the food laboratories and food companies have in-house laboratories and screen in that general way.
In terms of some of the solid phase contaminants, I think there’s a lack of in-house capability at the moment where one can use simpler [methods] like optical microscopy and another microscopy-based methods to identify the physical solid phase contaminants.
A good example is the use of magnetometers. Many companies use large-scale process line magnetometers to highlight the presence of metal pieces in their product. A magnetometer tells you that there are metal contaminants in your product, it does not provide a specific alloy identification. Whether one needs to go further to use additional methods and actually ascertain the composition of the alloy, is the question. That’s a new requirement—to identify what it is and then to try and assess where in the process it may have occurred. Using a microscopy-based method is advantageous because metal pieces are easily isolated and identified. Once food industry clients have an idea of what the alloy is, they can compare it to the metal alloys that make up their machinery along the way, whether it’s packaging or sorting machinery, [and] essentially establish where the particles enter into the food process.
With more regulatory and consumer scrutiny being placed on the authenticity of food products, companies must use technologies that can verify products and ingredients, and detect contaminants. NSF International recently acquired AuthenTechnologies, a testing laboratory that provides DNA-species identification services to improve authenticity, safety and quality of natural products. Using shorter segments and validated reference materials, AuthenTechnologies employs a DNA sequencing method that can identify “almost any” species and detect contaminants that cannot be distinguished morphologically or chemically. The method also screens for allergens, GMOs, fillers and filth.
“As the food supply chain becomes more complex and regulations continue to evolve and become more rigorous, this technology is becoming essential to achieving regulatory compliance and brand protection while preventing issues associated with fraud, mislabeling and adulteration,” said Lori Bestervelt, Ph.D, international executive vice president and chief technology officer at NSF, in a company release. AuthenTechnologies’ co-founder Danica Harbaugh Reynauld, Ph.D., adds, “We’ve developed a more highly specific DNA methodology capable of identifying a single organism to a complex blend of unlimited ingredients.” Reynauld, who will join NSF as global director of scientific innovation, will lead the NSF AuthenTechnologies center of excellence with NSF’s global network of labs.
In comparison to DNA barcoding, next-generation DNA sequencing is highly specific and can identify species in highly processed materials and complex mixtures. DNA barcoding is unable to differentiate between closely related species and is less suitable in detecting extracts as well.