Since food processors and consumers have expressed a
desire to reduce the use of synthetic chemicals in food
preservation, common culinary herbs and spices that
exhibit antimicrobial and antioxidant activities could be a
source of natural alternatives. Although herbs and spices in
Thailand, including Indian gooseberry and galangal,
contain potent antimicrobials and antioxidants, they have
not been sufficiently tested for their activities. The aims of
the present investigation were therefore to assess the
antimicrobial and antioxidant activities of Indian gooseberry
and galangal, which are common plants of Thailand.
From our preliminary study, it was found that Indian
gooseberry and galangal juices exhibited very low antimicrobial
and antioxidant activities, hence only the
ethanolic extracts of these plants were investigated in the
present study. The antimicrobial activities of the extracts
were determined by the disc diffusion and agar dilution
methods, while the antioxidant activities were determined
by the b-carotene bleaching method. The chemical
composition of the galangal extract and of its fractions
was studied using gas chromatography–mass spectrometry
(GC–MS). The composition of the Indian gooseberry
extract was determined by the UV-high performance liquid
chromatography (HPLC).
Since food processors and consumers have expressed adesire to reduce the use of synthetic chemicals in foodpreservation, common culinary herbs and spices thatexhibit antimicrobial and antioxidant activities could be asource of natural alternatives. Although herbs and spices inThailand, including Indian gooseberry and galangal,contain potent antimicrobials and antioxidants, they havenot been sufficiently tested for their activities. The aims ofthe present investigation were therefore to assess theantimicrobial and antioxidant activities of Indian gooseberryand galangal, which are common plants of Thailand.From our preliminary study, it was found that Indiangooseberry and galangal juices exhibited very low antimicrobialand antioxidant activities, hence only theethanolic extracts of these plants were investigated in thepresent study. The antimicrobial activities of the extractswere determined by the disc diffusion and agar dilutionmethods, while the antioxidant activities were determinedby the b-carotene bleaching method. The chemicalcomposition of the galangal extract and of its fractionswas studied using gas chromatography–mass spectrometry(GC–MS). The composition of the Indian gooseberryextract was determined by the UV-high performance liquidchromatography (HPLC).
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