Literatur

An overview of basic metallographic principles and procedures including detailed methods and stages of preparation.,

A collection of automated procedures developed in the metallographic laboratory at LECO CORPORATION. The procedures are reproducible but by no means absolute. Variations can and are expected to be tried by individuals processing samples by automated means. These parameters also are useful when manual preparation is being done.

Characterizing and understanding specific chemicals associated with aroma and flavors in a complex sample, like masala, can be beneficial for a wide range of purposes in the food, flavor, and fragrance industry. Among other objectives, detailed chemical information can be used for quality control, process optimization, reverse engineering of desired aroma characteristics, and to better understand a product/sample of interest. This application note demonstrates an easy workflow using statistical tools, and how a single GCxGC-TOFMS method can uncover a broad chemical profile that may be relevant to many unanswered analytical questions.

In this work, we explore the process of food spoilage by tracking the degradation of tomatoes. While this is a specific look at a tomato, an understanding of general food deterioration is important as spoilage impacts the quality and safety of food products and has significant financial implications. Until a process like this is well understood, evaluating the chemical profile and the changes is generally a non-targeted discovery task. For food spoilage, many of the changes that occur will be reflected in the volatile and semi-volatile components of the sample. The aroma profile of the sample itself changes, and chemical markers of microbial activity are also likely to form. GC and TOFMS are well-established techniques for these types of non-targeted characterizations of volatile and semi-volatile analytes and are well-suited for this type of investigation.

The Multi-Mode Ion Source provides a single solution for Electron Ionization, Positive Chemical Ionization, and Electron Capture Negative Ionization.

Gas chromatography (GC) is an important tool to separate individual analytes in a complex sample. Coupling GC with time-of-flight mass spectrometry (TOFMS) allows for identification and quantification of the separated analytes.

Protein is one of the most significant nutrients in cheeses. Accurate and precise determination of proteins helps to characterize nutritional and determine economic value.

Baijiu is a distilled spirit considered China's national liquor. SPME-GCxGC-TOFMS can help analyze samples through the complex distilling process to ensure quality manufacturing.

Protein is one of the most significant nutrients in cheeses. Accurate and precise determination of proteins helps to characterize nutritional and determine economic value.