Duarte Sónia, Nunes Lina, Kržišnik Davor, Humar Miha, Jones Dennis
LEAF (Linking Landscape, Environment, Agriculture and Food) Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa. Tapada da Ajuda, 1349-017 Lisboa, Portugal.
LNEC, National Laboratory for Civil Engineering, Structures Department, Av. do Brasil, 101, 1700-066 Lisbon, Portugal.
Insects. 2021 Feb 6;12(2):139. doi: 10.3390/insects12020139.
The majority of thermal modification processes are at temperatures greater than 180 °C, resulting in a product with some properties enhanced and some diminished (e.g., mechanical properties). However, the durability of thermally modified wood to termite attack is recognised as low. Recent attempts at combining thermal modification with chemical modification, either prior to or directly after the thermal process, are promising. Buffers, although not influencing the reaction systems, may interact on exposure to certain conditions, potentially acting as promoters of biological changes. In this study, two zwitterionic buffers, bicine and tricine, chosen for their potential to form Maillard-type products with fragmented hemicelluloses/volatiles, were assessed with and without thermal modification for two wood species (spruce and beech), with subsequent evaluation of their effect against subterranean termites ( Clément) and their symbiotic protists. The effect of the wood treatments on termites and their symbionts was visible after four weeks, especially for spruce treated with tricine and bicine and heat treatment (bicine HT), and for beech treated with bicine and bicine and heat treatment (bicine HT). The chemical behaviour of these substances should be further investigated when in contact with wood and also after heat treatment. This is the first study evaluating the effect of potential Maillard reactions with zwitterionic buffers on subterranean termite symbiotic fauna.
大多数热改性过程是在高于180°C的温度下进行的，这会导致产品的某些性能增强而某些性能降低（例如机械性能）。然而，热改性木材对白蚁攻击的耐久性被认为较低。最近在热改性之前或热改性之后直接将热改性与化学改性相结合的尝试很有前景。缓冲剂虽然不影响反应体系，但在暴露于某些条件下时可能会发生相互作用，有可能作为生物变化的促进剂。在本研究中，选择了两种两性离子缓冲剂，即N,N-二（2-羟乙基）甘氨酸（bicine）和N-三（羟甲基）甲基甘氨酸（tricine），因其有潜力与破碎的半纤维素/挥发物形成美拉德型产物，对两种木材（云杉和山毛榉）进行了有无热改性的评估，随后评估了它们对地下白蚁（克莱门特）及其共生原生生物的影响。四周后可以看到木材处理对白蚁及其共生体的影响，特别是对于用tricine和bicine以及热处理（bicine HT）处理的云杉，以及用bicine和bicine以及热处理（bicine HT）处理的山毛榉。这些物质与木材接触时以及热处理后的化学行为应进一步研究。这是第一项评估两性离子缓冲剂潜在美拉德反应对地下白蚁共生动物群影响的研究。
