Leenawaty Limantara et al. / Procedia Chemistry 14 ( 2015 ) 225 – 231
229
3.9 % 0.2 % up to 4.8 % 0 .4 % which is fairly higher than those of head cabbage (Kbs), green leaf lettuce (Sel),
and sword-leaf lettuce (Sak) whose values were less than 2.4 % 0.2 %.
F
ig. 1. In vivo analysis of green leafy vegetables by means of SPAD-502 chlorophyll meter and nitrogen meter.
Abbreviations were defined in Table 1. *: Head cabbage (Kbs) was unmeasurable by the nitrogen meter.
The measurement by means of chlorophyll and nitrogen meter is based on the principle of detecting absorbance
of
certain wavelengths which were sent through the leaf tissue. Both systems use particular alg
orithms for internal
calculations in order to produce in vivo data. This method is non-destructive, cheaper, and can be accomplished
wi
thin a short time after sample collection. Ho
wever, in vitro quantification is often needed for any verification and
comparison purpose. In the present study, HPLC was employed to quantify chlorophyll content of each green leafy
vegetable after extraction using organic solvent. Fig. 2 shows data of total peak area, obtained from HPLC
m
easurements, which are proportional to the actual amount of chlorophylls present in the leaf. It was consistent with
th
e result of in vivo measurements using chlorophyll and nitrogen meter, three vegetables showed an average of
total peak
area < 200 000, i. e. head cabbage (Kbs), green leaf lettuce (Sel), and sword-leaf lettuce (Sak).
Never
theless, the other seven vegetables were not in the same order as observed through in vivo measurement,
revealing
that in vitro detection is somehow needed f
or actual data verification.
Fig. 2. In vitro analysis of the methanol extract of green leafy vegetables by means of HPLC, expressed as total peak area of
chlorophyll a and b monitored at 400 nm to 700 nm. Abbreviations were defined in Table 1.
Leenawaty Limantara et al. / Procedia Chemistry 14 ( 2015 ) 225 – 231 2293.9 % 0.2 % up to 4.8 % 0 .4 % which is fairly higher than those of head cabbage (Kbs), green leaf lettuce (Sel),and sword-leaf lettuce (Sak) whose values were less than 2.4 % 0.2 %. Fig. 1. In vivo analysis of green leafy vegetables by means of SPAD-502 chlorophyll meter and nitrogen meter. Abbreviations were defined in Table 1. *: Head cabbage (Kbs) was unmeasurable by the nitrogen meter. The measurement by means of chlorophyll and nitrogen meter is based on the principle of detecting absorbance of certain wavelengths which were sent through the leaf tissue. Both systems use particular algorithms for internalcalculations in order to produce in vivo data. This method is non-destructive, cheaper, and can be accomplishedwithin a short time after sample collection. However, in vitro quantification is often needed for any verification andcomparison purpose. In the present study, HPLC was employed to quantify chlorophyll content of each green leafyvegetable after extraction using organic solvent. Fig. 2 shows data of total peak area, obtained from HPLCmeasurements, which are proportional to the actual amount of chlorophylls present in the leaf. It was consistent withthe result of in vivo measurements using chlorophyll and nitrogen meter, three vegetables showed an average oftotal peak area < 200 000, i. e. head cabbage (Kbs), green leaf lettuce (Sel), and sword-leaf lettuce (Sak).Nevertheless, the other seven vegetables were not in the same order as observed through in vivo measurement,revealing that in vitro detection is somehow needed for actual data verification. Fig. 2. In vitro analysis of the methanol extract of green leafy vegetables by means of HPLC, expressed as total peak area of chlorophyll a and b monitored at 400 nm to 700 nm. Abbreviations were defined in Table 1.
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