This scientific study of coffee silver skins and grounds, really has nothing, absolutely nothing to do with its effect on soil but I am putting the abstract and conclusion that these studies often are bollocks waste of money at best by people with too much time on their hands.
https://core.ac.uk/download/pd...
Abstract
Spent coffee grounds (SCG) and coffee silverskin(CS) represent a great pollution hazard if discharged into the environment. Taking this fact into account, the purpose of thisstudy was to evaluate the chemical composition, functional properties, and structural characteristics of these agro-industrial residues in order to identify the characteristics that allow their reutilization in industrial processes. According to the results, SCG and CS are both of ligno-cellulosic nature.Sugars polymerized to their cellulose and hemi-cellulose fractions correspond to 51.5 and 40.45 % w/w, respectively;however, the hemi-cellulose sugars and their composition sig-nificantly differ from one residue to another. SCG and CS particles differ in terms of morphology and crystallinity, but both materials have very low porosity and similar melting point. In terms of functional properties, SCG and CS present good water and oil holding capacities, emulsion activity and stability, and antioxidant potential, being therefore great candidates for use on food and pharmaceutical fields
Conclusions
This study allows concluding that SCG and CS are sugar-rich
lignocellulosic materials composed also of high levels of
insoluble, soluble, and total dietary fibers. Both residues have
interesting functional properties including water holding capacity, oil holding capacity, emulsion activity and stability,
and antioxidant potential, which open up possibilities for their
reutilization in different biotechnological process. They could
be used, for example, as preservatives in food formulations, as
natural antioxidant sources for application in food and pharmaceutical products, or as raw material to obtain new functional ingredients for food industry. SCG and CS are also
thermostable in a large range of temperature, being therefore
suitable for application in the manufacture of biomaterials and
encapsulation products for several industrial purposes. In
brief, the present study allows concluding that SCG and CS
have characteristics that make possible their reutilization in
different industrial fields. Despite some efforts have recently
been done in order to find possible alternatives to reuse these
residues, the implementation of industrial processes using
SCG or CS as raw material is still a challenge to be surpassed.
This study gives support to direct further research and developments in this area.
