Author: Lagacé, Luc

Showing 1 – 9 of 9 resources

How controlled inoculation of sap tubing with Pseudomonadota strains may influence maple syrup quality

The study recently published in Canadian Journal of Microbiology and available in open access consisted in the inoculation of the sap collection system with three Pseudomonadota strains and to assess the microbial and organoleptic quality of maple sap and syrup (Gagnon et al., 2025). This work represents a significant step: rather than simply characterizing microbial communities, the study tested whether an intentional inoculation of selected bacterial strains into tubing systems can steer microbial succession and influence syrup quality.

Publication:
Maple Syrup Digest
Date:
December 15, 2025

Tapping Below the Lateral Line for a Sustainable Use of Maple Resource

In recent years, someproducers have seen the benefit of tapping maples below the lateral line for multiple reasons. The main reason is to access a larger area of healthy wood on the trunk. This is because the maple tree produces a compartmentalization zone inside the trunk following tapping, which isolates the wound left by the tap hole.

By opting for a tapping pattern that respects the necessary spacing of taps from year to year based on their size and number, the likelihood of tapping into compartmentalized wood is minimized. If, in addition, the tapping area is expanded by allowing tapping below the lateral line, the exploitation of the trunk surface is further optimized, ensuring the sustainability of sap collection.

Publication:
Maple Syrup Digest
Date:
March 15, 2025

Effect of the new high vacuum technology on the chemical composition of maple sap and syrup

Techniques used to produce maple syrup have considerably evolved over the last decades making them more efficient and economically profitable. However, these advances must respect composition and quality standards as well as authenticity of maple products. Recently, a new and improved high vacuum technology has been made available to producers to achieve higher sap yields. The aim of the present study was therefore to evaluate the effect of this new system on the yield of sap and on the sap and syrup chemical composition.

Publication:
Heliyon
Date:
June 1, 2019

Chemical and microbial characterization of ropy maple sap and syrup

Ropiness of maple syrup is a phenomenon that can occur several times in the season. The alteration known as ÒropinessÓ is characterized by a viscous, thick, slimy/jelly-like texture which, although not noticeably altering the taste, renders the product unpleasant in terms of mouthfeel. The aim of this study was to estimate the economic impact of production of ropy maple syrup in the region of Quebec, to more deeply identify and characterize bacteria associated to this type of quality defect, and to study the composition of Polysaccharides found in stringy maple syrup.

Publication:
Maple Syrup Digest
Date:
December 1, 2018

A systems biology approach to explore the impact of maple tree dormancy release on sap variation and maple syrup quality

Maple sap is a complex nutrient matrix collected during spring to produce maple syrup. The characteristics of sap change over the production period and its composition directly impacts syrup quality. This variability could in part be attributed to changes in tree metabolism following dormancy release, but little is known about these changes in deciduous trees. Therefore, understanding the variation in sap composition associated with dormancy release could help pinpoint the causes of some defects in maple syrup. In particular, a defect known as ÒbuddyÓ, is an increasing concern for the industry. This off-flavor appears around the time of bud break, hence its name. To investigate sap variation related to bud break and the buddy defect, we monitored sap variation with respect to a dormancy release index (Sbb) and syrup quality. First, we looked at variation in amino acid content during this period. We observed a shift in amino acid relative proportions associated with dormancy release and found that most of them increase rapidly near the point of bud break, correlating with changes in syrup quality. Second, we identified biological processes that respond to variation in maple sap by performing a competition assay using the barcoded Saccharomyces cerevisiae prototroph deletion collection. This untargeted approach revealed that the organic sulfur content may be responsible for the development of the buddy off-flavor, and that dormancy release is necessary for the appearance of the defect, but other factors such as microbial activity may also be contributing.

Publication:
Nature
Date:
October 2, 2018

Potential Plastic Residues in Maple Sap and Syrup Following Isopropyl Alcohol Sanitation of the Tubing System

In recent years isopropyl alcohol (IPA) sanitation was proposed after the sugar season to significantly reduce the microbial load and start the next sugar season with a sanitized system. This study was conducted to evaluate the potential leaching of chemical compounds found in plastic polymers used in maple sap collection system tubing.

Publication:
Maple Syrup Digest
Date:
October 1, 2017

Analysis of plastic residues in maple sap and syrup collected from tubing systems sanitized with isopropyl alcohol

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.

Publication:
Heliyon
Date:
May 22, 2017

Sulfite Concentration in Pure Maple Syrup

Maple syrup is a natural product free of artificial coloring or other additives. Regardless, some publications mention that maple syrup may contain sulfites. In this study, which is conducted by Center ACER in collaboration with UVM Proctor Maple Research Center, direct measurements of sulfites concentration in maple syrup samples collected during 2011 and 2012 were made.

Publication:
Maple Syrup Digest
Date:
October 1, 2013

Effects of Various Filters on Sap Quality and Characteristics

Sap filters can remove residue or debris, which may inadvertently enter the sap through the collection system or during storage. Moreover, filtering may improve the storage potential of maple sap, improve sap quality especially during mid- to late-season and help in keeping the evaporator system clean.

Publication:
Maple Syrup Digest
Date:
February 1, 2008