Lagacé Luc, Charron Carmen, Sadiki Mustapha
Centre de recherche, de développement et de transfert technologique acéricole inc. 142 rang Lainesse, St-Norbert d'Arthabaska, Québec, Canada. G0P 1B0.
Heliyon. 2017 May 22;3(5):e00306. doi: 10.1016/j.heliyon.2017.e00306. eCollection 2017 May.
A plastic tubing system operated under vacuum is usually used to collect sap from maple trees during spring time to produce maple syrup. This system is commonly sanitized with isopropyl alcohol (IPA) to remove microbial contamination colonizing the system during the sugar season. Questions have been raised whether IPA would contribute to the leaching of plastic residues in maple sap and syrup coming from sanitized systems. First, an extraction experiment was performed in the lab on commercial plastic tubing materials that were submitted to IPA under harsh conditions. The results of the GC-MS analysis revealed the presence of many compounds that served has target for further tests. Secondly, tests were done on early and mid-season maple sap and syrup coming from many sugarbushes using IPA or not to determine potential concentrations of plastic residues. Results obtained from sap and syrup samples showed that no quantifiable (< 1-75 μg/L) concentration of any plastic molecules tested was determined in all samples coming from IPA treated or not treated systems. However, some samples of first sap run used as a rinse solution to be discarded before the season start and that were coming from non sanitized or IPA sanitized systems, showed quantifiable concentrations of chemical residue such as ultraviolet protector (octabenzone). These results show that IPA can be safely used to sanitize maple sap collection system in regards to the leaching of plastic residues in maple sap and syrup and reinforced the need to thoroughly rinse the tubing system at the beginning of the season for both sanitized and non sanitized systems.
在春季，通常使用在真空下运行的塑料管道系统从枫树上采集树液以生产枫糖浆。该系统通常用异丙醇（IPA）进行消毒，以去除制糖季节期间在系统中定殖的微生物污染。有人提出疑问，IPA是否会导致来自消毒系统的塑料残留物在枫糖浆和糖浆中浸出。首先，在实验室中对商业塑料管材进行了提取实验，这些管材在苛刻条件下接触IPA。气相色谱 - 质谱分析结果显示存在许多化合物，这些化合物作为进一步测试的目标。其次，对来自许多糖枫林的早季和中季枫糖浆和糖浆进行了测试，这些糖枫林使用或未使用IPA，以确定塑料残留物的潜在浓度。从树液和糖浆样品中获得的结果表明，在来自经过IPA处理或未处理系统的所有样品中，未检测到任何测试塑料分子的可量化浓度（<1 - 75μg/L）。然而，一些用作冲洗溶液的初榨树液样品在季节开始前被丢弃，这些样品来自未消毒或经IPA消毒的系统，显示出可量化浓度的化学残留物，如紫外线防护剂（二苯甲酰甲烷）。这些结果表明，就塑料残留物在枫糖浆和糖浆中的浸出而言，IPA可以安全地用于消毒枫糖浆采集系统，并强调了在季节开始时对消毒和未消毒系统的管道系统进行彻底冲洗的必要性。
