Discover Food Safety and Quality

Fast Digestion Analysis of Lead and Cadmium in Rice Using Graphite Furnace Atomic Absorption

Lead (Pb) and cadmium (Cd) are common pollutants in grains and are extremely toxic. Pb is harmful to human organs even at trace levels, and once it accumulates in the body, it causes inhibition of hemoglobin formation and neurological disorders. Cd is even classified as human carcinogen [Group 1 - according to International Agency for Research on Cancer]. It is reported that Cd leads to severe kidney problems which can be fatal and is also associated with brittle bones and liver problems. Rice, as the most widely consumed cereal grain in Asia/China, can quickly pick up Pb and Cd from toxins, pesticides and fertilizers in the soil, thereby endangering the health of millions of people through their diet. Therefore, it is extremely important to develop a simple, reliable method to monitor the levels of Pb and Cd in rice. According to Chinese national standard GB 2715-2016 Hygienic Standard for Grain, the maximum concentrations of Pb or Cd in grains must be below 0.2 mg/kg; the allowable level in the European Union is the same [EC 1881/2006]. The official technique for the determination of heavy metals in both cases is graphite furnace atomic absorption spectroscopy (GFAAS, GB/T 5009. 12-2017, GB/T 5009-2017. 15 and EN 14083:2003). Samples can be pretreated using various methods, including microwave digestion, hot block digestion, dry ashing, and hot plate digestion. It is found that these conventional digestion procedures are always complicated and time-consuming (two-four hours or even longer). Plus, conventional sample preparation techniques require large quantities of corrosive and oxidizing reagents, increasing the chance for contamination which could lead to inaccurate results. Special PTFE vessels are needed for microwave digestion; however, reusable utensils might also cause cross contamination.

Analysis of Multi-Residue Pesticides in Rice by LC/MS/MS

Liquid chromatography tandem mass spectrometry (LC/MS/MS) has become the method of choice for pesticide analysis due to its high selectivity and sensitivity as well as its suitability for a wide range of compounds in various sample matrices. 0 In this study, a fast, sensitive and selective multi- residue method has been developed for analysis of over 200 pesticides in rice samples by coupling a modified QuEChERS extraction method with LC/MS/MS. Using time-managed- MRM™ in the QSight® triple quadrupole mass spectrometer, the optimum dwell time of multiple MRM transitions can be generated automatically for the targeted analytes. This not only saves time in method development but also improves data quality and analytical performance, as demonstrated in this study by the results of multi- residue pesticide analysis in rice samples.

Rice (Japanese) method - RVA 22.03

Rice sensory quality is of prime importance throughout Asia where rice is a staple food. This RVA method, developed by The Food Agency in Japan, provides a longer profile than Method 10, to better discriminate between rice samples of similar quality.

Rice bran - DA 7250

Rice bran is a by-product of the rice millng process, and is an important ingredient in many animal feeds. As such, its nutritional content is of high importance, and rapid analysis of parameters such as moisture, oil and protein are great benefit to rice processors as well as feed producers. Tis application demonstrates how the DA 7250 can analyze rice bran in a few seconds using large open rotating sample dishes.

Rice RVA Method 10.05

Rice pasting quality is largely dictated by the quality of its starch component, which varies considerably between varieties. The pasting qualities are related to the sensory parameters in whole rice, and are also critical for other uses such as adjuncts in brewing. Combining speed, precision, flexibility and automation, the RVA is a unique tool for product development, quality and process control and quality assurance.

Grain Testing Solutions Brochure

The grain industry is very complex. It’s global, diverse, and can also present analytical challenges. Today’s grain users demand more when it comes to quality, safety, and uniformity. In addition, they seek diverse products with unique characteristics. PerkinElmer is equipped to help the grain industry in its quest to feed the world – nutritiously and economically. Our testing and analysis solutions encompass the three primary areas required for complete knowledge of grains and their derivatives – composition, functionality, and safety.