Examinando por Autor "Mueller, Joachin"

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Application of HACCP Principles to Local Drying Processes of Capsicum Species in Bolivia and Peru
(ResearchGate, 2010-09-16) Salvatierra Rojas, Ana; Nagle, Marcus; Argyropoulos, Dimitrios; Ríos Lobo, Llermé; Serrano Quintanilla, Edwin; Bejarano Martinez, Carlos; Jäger, Matthias; Mueller, Joachin
The aims of the proposed research were to identify and document species, production and uses, describe processing procedures for drying, evaluate drying conditions and practices and apply Hazard Analysis and Critical Control Point (HACCP) principles to identify the critical control points involved in drying processes. The study focused on cultivated species of capsicum in the areas around Chuquisaca, Bolivia and Lima, Peru under the guidance of local partners. Farmer interviews were conducted to obtain information about current postharvest handling practices. In addition, drying procedures were evaluated at several sites. Parameters were documented, including drying conditions and behaviour of the product by placing climate sensors in the drying bulks and sampling and analysing the product at significant processing points. Based on this data, HACCP principles were applied, namely: product description, identification of intended uses, construction and confirmation of flow diagrams, list potential hazards, hazard analysis and consideration of control measures, establishment of critical control points based on Codex Alimentarius and establishment of critical limits. Recommendations are given as a baseline for the complete implementation HACCP standards corresponding to the monitoring of the production chain to ensure food safety. Corrective actions can now be implemented via verification procedures and documentation and record keeping will allow realisation of HACCP quality assurance for the production of dried Capsicum in Bolivia and Peru.
Assessment of Current Drying Practices for South American Pepper Varieties ( Capsicum spp ) with Respect to Final Product Quality
(The Allen Institute for Artificial Intelligence, 2010-10-31) Halle, Christian; Nagle, Marcus; Argyropoulos, Dimitrios; Serrano, E.; Peña Pineda, Karla Mónica; Martínez, C. B.; Jäger, Matthias; Mueller, Joachin
Worldwide fresh and dried Capsicum species are used as ingredients in foods and medicines. In Peru and Bolivia, with large percentages of population occupied in agriculture and living below the poverty line, capsicum is among the most important agricultural products. However, especially small-scale farmers face reduced sales due to market restrictions on low quality products. Many studies show that dried Capsicum especially is often contaminated with mycotoxins, secondary metabolites of microbes, which pose significant health risks to consumers. As fungal growth depends on moisture content, drying is a critically important postharvest process. The current practice is largely open-air sun drying of capsicum, a fruit with high water content, which allows for quick infection by microbes. Additional processing like milling can further increase contamination. Another aspect of Capsicum processing that addresses livelihood of local people is the high content of carotenoids that are responsible for the red colour. Carotenoids have an important role in human nutrition as they are metabolised to vitamin A after ingestion. In many developing countries vitamin A deficiency causes severe health problems and losses of up to 53 % of the initial carotenoid content during drying have been reported due to sensitivity to heat and UV radiation. This study evaluated the prevailing postharvest system of the Capsicum drying in Peru and Bolivia with a focus on microbial contamination and carotenoid degradation. Drying processes of several locally grown Capsicum cultivars were observed and products were sampled at various postharvest points. Different quality parameters including moisture content, colour, microbial contamination, mycotoxin content and beta-carotene were determined by standard methods. By reverse analysis of the production chain, critical control points were identified where measures can be taken to improve product quality. As a result, recommendations for improved manufacturing practices are given. By analysis and optimisation of the current drying techniques, product quality can be improved and value increased, generating new market opportunities that can increase income of local farmers. Furthermore, increasing nutritional value and decreasing the presence of mycotoxins will contribute to the health and well-being of consumers of dried capsicum.