The impact of pulsed light (PL) fluence on reduction of Aspergillus carbonarius and Aspergillus flavus conidia in barley grains (a_w 0.60 and 0.98), germinability and structure was studied. Treatments were done for 5–75 s at 5 and 10 cm distance from the flash lamp (fluence: 11.0–165.8 J/cm² at 5 cm, and 6.0–89.6 J/cm² at 10 cm). Maximum reduction in fungal population was 1.2–1.7 log cycles up to 5–15 s (fluence: 6.0–18.0 J/cm²). Acceptable germinability values were obtained up to 25 s treatment at 10 cm distance. Light microscopy study supported changes in germinability. Most of the structure elements of the caryopsis were drastically altered with high fluence values, while embryo viability was maintained with doses up to 29.9 J/cm². PL up to 18.0 J/cm² could be a nonchemical option to reduce moulds in barley with minor impact on germinability.

Industrial relevance text

The reduction of fungal load in malting barley will contribute to improve the production process and the quality of beer. The application of intense light pulses up to 18.0 J/cm² (15 s, 10 cm from the lamp quartz window) could be a potentially suitable nonchemical (residue-free) option to reduce fungal presence in barley grains with minor impact on structure and germinability.

中文翻译：

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脉冲光灭活麦芽大麦中碳曲霉和黄曲霉的行为及其对发芽能力和微结构的影响

脉冲光（PL）注量的对减少的影响曲霉炭黑和黄曲霉在大麦谷粒分生孢子（一_瓦特0.60和0.98），发芽和结构进行了研究。处理物在从闪光灯5和10厘米的距离为5-75 S DONE（积分通量：11.0-165.8焦耳/厘米²在5厘米，和6.0-89.6焦/厘米²在10厘米）。真菌种群最大减少量为1.2–1.7个对数周期，长达5–15 s（通量：6.0–18.0 J / cm ²）。在10 cm的距离下进行长达25 s的处理后，可获得可接受的发芽性值。光学显微镜研究支持发芽性的变化。腕足动物的大多数结构元素都以高能量密度值发生了巨大变化，而胚胎活力则以29.9 J / cm ^2的剂量得以维持。PL高达18.0 J / cm ²可能是减少大麦发霉的一种非化学选择，对发芽性的影响较小。

行业相关文字

麦芽大麦中真菌含量的减少将有助于改善生产过程和啤酒质量。施加高达18.0 J / cm ²（15 s，距灯石英窗口10 cm）的强光脉冲可能是一种合适的非化学方法（无残留），可减少大麦籽粒中的真菌存在，对结构和结构的影响较小。萌发性。