The quality of crude glycerine influences the fermentation and nutritive value of Piatã grass silage

Abstract

We aimed to evaluate the effects of crude glycerine purity and levels of glycerol on the fermentative profile, microorganisms counting, and nutritional value of Piatã grass silage. The experiment was carried out in a 3×3+1 completely randomized factorial design using three different types of crude glycerine [low purity (40% of glycerol), medium purity (60% glycerol), and high purity (80% glycerol)], three doses of glycerol (20, 40, and 60 g/kg DM), and a control (no crude glycerine added) as an additional treatment, which were stored for 80 days. Statistical differences were not observed on fermentative losses of the treatments tested. The increase of glycerol doses resulted in higher levels of non-fibrous carbohydrates and lower levels of fibre components. The addition of low-purity crude glycerine increased the levels of fat and in vitro digestibility of silages. The highest levels of lactic acid and acetic acid occurred in the treatments with 60 g/kg of glycerol when using crude glycerine with a low purity. The lowest lactic acid content was observed in the control treatment and in the lowest dose of glycerol. The highest glycerol dose (60 g/kg), associated with the lowest degree of crude glycerine purity (40%) resulted in the greatest nutritional value and provided the best silage conservation.

Factores que afectan la calidad del ensilaje de pasto Kikuyo (Cenchrus clandestinus)

“…La utilización de glicerina redujo las pérdidas de material vegetal y mejoró la composición química del ensilaje, lo cual también ha sido reportado por otros autores (Pereira Santos et al, 2015;Watte Schwingel et al, 2020) e indica un efecto supresor del crecimiento de poblaciones de microorganismos que afectan la calidad del ensilaje (Bensimon Gomes et al, 2015). Aunado al anterior hallazgo, en este estudio la inclusión de glicerina cruda al 2 % incrementó la concentración de ácido láctico; sin embargo, Kass et al (2012) a pesar de que reportaron un incremento en las poblaciones de lactobacilos, observaron una reducción en la concentración de este ácido, lo que puede sugerir una mayor eficiencia en la formación de lactato a partir de glicerina.…”

Uso de glicerina bruta en la reducción de pérdidas fermentativas de ensilaje de <em>Pennisetum purpureum</em>

“…Por contener elevados tenores de materia seca, la inclusión de glicerina bruta contribuyo en el aumento del contenido de MS del ensilaje (Tabla 1), que según Rigueira et al (2018) y Silva et al (2019, la GB mejora el perfil de fermentación y la composición químico -bromatológico y características nutricionales (Machado et al, 2019), siendo observado (Schwingel et al, 2020) que, a mayor dosis de GB (60 g/kg), asociada a menor grado de pureza (40%), resulta en mayor valor nutricional y proporciona mejor conservación del ensilado, sin embargo, el exceso de humedad propicia condiciones para obtención de ensilajes butíricos de baja calidad, donde la descomposición de la proteína es elevada, con evidente disminución en el valor nutritivo y perdidas fermentativas (Castro et al, 2006).…”

Purification and use of crude green glycerol from the transesterification of triglycerides in the formulation of an alcohol gel hand sanitizer

“…It is used as a solvent, humectant, plasticizer, and sweetener 5 ; in the production of nitroglycerine (dynamite) 6 , liquid soap 7 , liquors 8 , confectionery 9 , blacking 10 , printing and copying inks 11 , elastic glues 12 , lead oxide cements 13 ; to keep fabrics pliable 14 , to preserve printing on cotton 2 , 15 , for printing rollers 16 , hectographs 17 ; to keep frost off windshields 18 ; as an antifreeze in automobiles 19 , gas meters and hydraulic jacks 20 , and in shock absorber fluids 21 . It is used as a nutrient in fermentation fluids 22 – 24 . Glycerol is also used in home-brewed spirits to give them a smoother or mellower flavor 25 , and it is employed as a precursor for the synthesis of various other products of greater value 26 , 27 .…”