| |
As an alternative to liquid honey, techniques have been developed to
guide the natural crystallization of honey towards completely crystallized,
stable and homogeneous end products with a pleasant appearance, creamy
consistency and good reception by most consumers. The advantage of this
method is that it does not require any treatment which would alter by any
means the fragile and beneficial characteristics of the honey. In addition,
these methods are also well suited for small scale production and become
more complicated only with an increase in quantity.
The basic principle consists of accelerating the natural tendency to
crystallize by the addition of a small quantity of already crystallized
honey. This method can be used with all honeys which show a tendency to
crystallize either rapidly, slowly or incompletely. In the most simple
method, liquid honey (naturally liquid or liquefied) is mixed with
completely crystallized honey, preferably containing very fine crystals, at
a ratio of 9 to 1. The mixture should be warmed to only 24 to 280C
in order to allow easier mixing and to ensure that none of the crystals are
melting. No air bubbles should be included during this mixing. Prior to
bottling, the honey is left to settle for a few hours to allow any air
bubbles to escape. After bottling, the containers are kept as close to 140C
as possible. Depending on the moisture content, crystallization is complete
in about 10-14 days and a fine crystal honey of more or less solid
consistency is obtained.
The major inconvenience of this method is the excessive hardness reached
by low moisture honeys due to the formation of transversal crystals, special
agglomerations. To avoid such occurrences, potentially unpleasant for the
consumer, a method has to be chosen which allows the separation of each
individual crystal and which thus gives the honey a creamy consistency. One
aesthetic problem with this type of preparation is the formation of whitish
blooms on the surface and inside enclosed air bubbles, due to the surface
evaporation of water and drying of glucose crystals.
One method of softening this crystallized honey consists of two distinct
phases. In the first phase the guided crystallization is conducted as
described previously. However, the honey (seeded with fine crystals) is left
to crystallize for approximately 10 days in larger containers (25 to 300 kg)
at a temperature of 140C. Instead of bottling, the containers are
then placed into a warm room at 28 to 300C until the honey has
become a little softer. During this second phase, with the honey always
below its melting point, a homogenizer or mixer is introduced into the
softened honey in order to break up the crystals (Gonnet, 1985 and 1986).
Once stirred, it can be bottled. Alternatively, even the simple warming in
the heating room and subsequent bottling will give satisfactory results,
since even this small movement of the softened honey will break up the
crystals. The critical point to watch is the temperature during softening
and stirring, which should always remain below 280C. If the
crystals start melting the whole process will fail.
In another method, the seeded honey is stirred at a temperature at which
the crystals readily grow (near 200C). The same water-jacketed
vats for heating honey can be used cooling with cold water. Agitation
accelerates crystal formation considerably and helps formation of smaller
crystals. After two to three days, crystallization is complete and honey can
be bottled, possibly raising the temperature a few degrees to ease the flow.
The difficulty
here is to stir a cold and therefore very viscous mass of
honey. This not only requires considerable mechanical force, but also
carries a risk of incorporating air and creating a foam. It is therefore
necessary to work with sufficiently powerful motors and a slowly rotating
propeller (a few rotations per minute) which should remain immersed in the
honey. In the largest industrial operations, in addition to the standard
mixing devices, a continuous cooling and scraping system is employed for
homogenization. For small quantities not exceeding 100 kg at a time, it is
possible to do everything manually and stir once or twice a day with a long
wooden paddle.
Creamed honeys, produced by one of the last two processes, will always
have a creamy consistency more or less fluid, depending on the water
content. The main disadvantage of these preparations is their instability at
warm temperatures. If stored at temperatures above 20 0C for many
months the crystals tend to precipitate on the bottom of containers leaving
a more or less thick, liquid layer at the surface. This separation of liquid
and crystalline phases (or partial reliquefaction) is more rapid in honeys
with a higher moisture content and at temperatures close to or above 25 °C.
In temperate climates with honeys averaging less than 18% moisture and low
storage temperatures (favouring crystallization) guided crystallization
appears a very advantageous and profitable process, as the profusion of the
Dyce process in Canada indicates (Dyce, 1975).
A problem common to all these processes is the choice of seed honey,
which has to have very fine crystals itself. Some honeys naturally form very
small crystals. However, if no such honey is available, a normal,
crystallized honey can be milled by passing it through a meat grinder or
grinding it with a pestle and mortar to reduce the size of the crystals. If
creamed honeys can be found (for example in a shop) they can be used as a
starter. Small quantities are mixed with liquid honey and left to
crystallize for ten days at 140C with occasional stirring. This
is then used as seed for a larger batch, always mixing seed honey with
liquid honey at the ratio of 1:9 i.e. 1 kg of seed honey to 9 kg of liquid
honey. This process can be repeated until the final, desired batch size is
reached. When bottling, sufficient crystallized honey should be retained to
seed the next batch.
For the manipulation of cold and therefore very viscous honey, the mixer,
pump and bottling machine have to be very strong. The facilities and
structures necessary for cooling during processing and storage are
expensive. Smaller scale manual operations do not have these difficulties
and can produce an attractive product cheaply and without expensive
equipment, if ambient temperatures are not too high. Lastly, if the honey to
be processed has a high moisture content and there is a possibility of
fermentation, it should be pasteurized at 65 0C for 5
to 10 minutes before crystallization. In this case, the seed honey has
to be free of yeasts. |