Version 1
: Received: 13 April 2021 / Approved: 14 April 2021 / Online: 14 April 2021 (14:10:52 CEST)
Version 2
: Received: 28 May 2021 / Approved: 28 May 2021 / Online: 28 May 2021 (11:05:58 CEST)
Version 3
: Received: 15 June 2021 / Approved: 16 June 2021 / Online: 16 June 2021 (11:33:10 CEST)
Sanchiz, A.; Sánchez-Enciso, P.; Cuadrado, C.; Linacero, R. Detection of Peanut Allergen by Real-Time PCR: Looking for a Suitable Detection Marker as Affected by Processing. Foods2021, 10, 1421.
Sanchiz, A.; Sánchez-Enciso, P.; Cuadrado, C.; Linacero, R. Detection of Peanut Allergen by Real-Time PCR: Looking for a Suitable Detection Marker as Affected by Processing. Foods 2021, 10, 1421.
Sanchiz, A.; Sánchez-Enciso, P.; Cuadrado, C.; Linacero, R. Detection of Peanut Allergen by Real-Time PCR: Looking for a Suitable Detection Marker as Affected by Processing. Foods2021, 10, 1421.
Sanchiz, A.; Sánchez-Enciso, P.; Cuadrado, C.; Linacero, R. Detection of Peanut Allergen by Real-Time PCR: Looking for a Suitable Detection Marker as Affected by Processing. Foods 2021, 10, 1421.
Abstract
Peanut (Arachis hypogaea) contains allergenic proteins, which make it harmful to the sensitised population. The presence of peanut in foods must be indicated on label, to prevent accidental consumption by allergic population. In this work, we use chloroplast markers for specifically detection of peanut by real-time PCR, in order to increase the assay sensitivity. Binary mixtures of raw and processed peanut flour in wheat were performed at concentrations ranging from 100000 to 0.1 mg/kg. DNA isolation from peanut, mixtures and other legumes was carried out following three protocols for obtaining genomic and chloroplast-enrich DNA. Quantity and quality of DNA was evaluated, obtaining better results for protocol 2. Specificity and sensitivity of the method has been assayed with specific primers for three chloroplast markers (mat k, rpl16 and trnH-psbA) and Ara h 6 peanut allergen-coding region was selected as nuclear low-copy target and TaqMan probes. Efficiency and linear correlation of calibration curves were within the adequate ranges. Mat k chloroplast marker yielded the most sensitive and efficient detection for peanut. Moreover, detection of mat K in binary mixtures of processed samples was possible up to 10 mg/kg even after boiling, and autoclave 121°C 15 min, with acceptable efficiency and linear correlation. Applicability of the method has been assayed in several commercial food products.
Keywords
Real-time PCR; peanut; food allergen; chloroplast marker; DNA isolation
Subject
Biology and Life Sciences, Anatomy and Physiology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Commenter: Carmen Cuadrado
Commenter's Conflict of Interests: Author