PERUBAHAN WARNA PADA KAYU TERAS JATI (TECTONA GRANDIS) DORENG MELALUI EKSTRAKSI BERTURUTAN
ABSTRACT: Black streak
discolorations in the heartwood of teak (Tectona grandis) may lead to
considerable economic loss. Unfortunately, the actual properties of the
discolored wood remain unknown as yet. In this paper, the influence of wood
extractives on black streaked heartwood color was evaluated by successive
solvent extraction (n-hexane, ethyl acetate, methanol and hot-water) and color
measurement (CIELab system). The change in color co-ordinates, difference in
brightness (DL*), difference in redness (Da*), and difference in yellowness
(Db*), between sucessively extracted and control sample was also calculated.
Color of black streaked heartwood changed by any solvents, whereas n-hexane and
ethyl acetate extractions apparently increased the brightness L* values.
Extraction with methanol and hot water slightly affected the color differences.
However, some differences were still observed in the color properties between
the black streaked and normal heartwood, indicating that some substances are
polymeric and tightly bound to the cell wall matrix. Some quinones :
tectoquinone, tectol, lapachol, desoxylapachol and its isomer, were detected as
major compounds by means of GC-MS in the n-hexane and ethyl acetate soluble
extracts. The involvement of those compounds, thus, to the blackening heartwood
should be investigated in the future studies.
Keywords: Tectona grandis,
black streak, color, extractives
Penulis: Ganis LUKMANDARU
Kode Jurnal: jpkehutanandd090061
